Acceleration Calculator
Calculate acceleration from velocity change and time, force and mass, or centripetal motion. Convert between m/s², g-force, ft/s², and more.
Free Physics Calculators
497 toolsExplore mechanics, circuits, heat transfer, waves, and other physics topics with calculators built for coursework, engineering checks, and scientific reference.
Mechanics
123 calculatorsForce, motion, energy, work, power, and momentum calculators.
Acceleration Due to Gravity Calculator
Calculate gravitational acceleration g at different altitudes, latitudes, and on different celestial bodies including Moon, Mars, and Jupiter.
Alfvén Velocity Calculator
Calculate Alfvén wave speed in plasma from magnetic field strength and mass density. Compare speeds across solar wind, corona, tokamak, and interstellar media.
Angular Acceleration Calculator
Calculate angular acceleration from velocity change, torque/inertia, or linear acceleration. Convert between rad/s², rpm/s, deg/s², and rev/s².
Angular Displacement Calculator
Calculate angular displacement using θ = ωt + ½αt². Find revolutions, degrees, and final velocity for rotational kinematics problems.
Angular Frequency Calculator
Convert between angular frequency (ω), frequency (f), and period (T) using ω = 2πf. Includes RPM, deg/s, and electromagnetic wavelength outputs.
Angular Momentum Calculator
Calculate angular momentum L = Iω for rigid bodies and L = mvr for particles. Explore conservation of angular momentum with before/after scenarios.
Angular Velocity Calculator
Calculate angular velocity from angle/time, RPM, or linear velocity. Convert between rad/s, RPM, deg/s. Find tangential speed at any radius.
API Gravity Calculator
Convert between API gravity and specific gravity for petroleum products. Classify crude oils as light, medium, heavy, or extra heavy with density outputs.
Archimedes' Principle Calculator
Calculate buoyant force, apparent weight, and whether an object floats or sinks using Archimedes' principle. Compare behavior across fluids.
Arrow Speed Calculator
Calculate arrow speed from bow draw weight and draw length, or from chronograph data. Get kinetic energy, momentum, and game suitability analysis.
Bernoulli Equation Calculator
Solve Bernoulli's equation for velocity, pressure, or height between two flow points. Energy balance visualization and fluid reference table included.
Bullet Energy Calculator
Calculate muzzle energy, momentum, and power factor from bullet mass and velocity. Compare calibers and check competition thresholds.
Buoyancy Calculator
Determine if an object floats or sinks, calculate buoyant force, apparent weight, submersion fraction, and payload capacity for various shapes and materials.
Buoyancy Experiment Calculator
Simulate Archimedes' weighing experiment: weigh an object in air and water to find its volume, density, and identify its material from density tables.
Buoyant Force Calculator
Calculate buoyant force for spheres, cubes, cylinders, and boxes in any fluid. Supports partial submersion, multiple fluids, and weight capacity analysis.
Capacitor Energy Calculator
Calculate energy stored in capacitors using E = ½CV². Supports series and parallel combinations with charge, peak current, and RC time constant outputs.
Car Crash Force Calculator
Calculate impact force, G-forces, and crash duration from vehicle speed and crumple zone. Compare seatbelt vs no seatbelt occupant forces.
Centrifugal Force Calculator
Calculate centrifugal force (F = mω²r) from mass, radius, and rotational speed. Supports RPM, rad/s, and velocity inputs with G-force analysis.
Centrifuge Speed Calculator
Convert between RPM and RCF (× g) for centrifuges. Calculate required RPM from g-force or compute RCF from speed and rotor radius.
Centripetal Force Calculator
Calculate centripetal force (F = mv²/r) for circular motion. Solve for force, mass, velocity, or radius with G-force analysis and real-world examples.
Conservation of Momentum Calculator
Calculate elastic and inelastic collision outcomes. Find final velocities, kinetic energy loss, and momentum conservation for two-body collisions and explosions.
Coriolis Effect Calculator
Calculate Coriolis deflection, acceleration, and force for moving objects on a rotating Earth. Analyze projectiles, weather systems, and ocean currents.
Drag Equation Calculator
Calculate aerodynamic and hydrodynamic drag force using the drag equation F_d = ½ρv²C_dA. Includes fluid presets, shape coefficients, velocity-drag tables, and power analysis.
Drift Velocity Calculator
Calculate electron drift velocity in conductors using v_d = I/(nAq). Includes material presets, AWG wire gauges, current density, and traversal time analysis.
Elastic Constants Calculator
Relate Young's modulus, shear modulus, bulk modulus, and Poisson's ratio. Find any elastic constant from the others with material presets and conversion formulas.
Elastic Potential Energy Calculator
Calculate energy stored in springs using PE = ½kx². Includes spring arrangements, oscillation frequency, velocity analysis, and energy-displacement tables.
Electric Motor Torque Calculator
Calculate motor torque from power and speed using τ = P/ω. Includes efficiency, unit conversions (N·m, lb·ft, oz·in), speed-torque tables, and NEMA frame reference.
Electron Speed Calculator
Calculate electron speed from kinetic energy or accelerating voltage. Includes relativistic corrections, de Broglie wavelength, classical vs relativistic comparison.
EM Energy Density Calculator
Calculate energy density of electric and magnetic fields using u_E = ½ε₀E² and u_B = B²/(2μ₀). Includes Poynting vector, EM wave analysis, and field comparison tables.
Energy to Wavelength Calculator
Convert between photon energy and wavelength using E = hc/λ. Supports eV, joules, frequency, and nm inputs. Includes EM spectrum reference and common photon energies.
Escape Velocity Calculator
Calculate escape velocity for any celestial body using v_e = √(2GM/r). Includes solar system presets, altitude analysis, orbital velocity, and Schwarzschild radius.
Flywheel Energy Storage Calculator
Calculate energy stored in a spinning flywheel using E = ½Iω². Supports different geometries, RPM-energy tables, rim speed safety analysis, and energy density comparisons.
Foot-Pounds of Energy Calculator
Convert foot-pounds to joules, BTU, calories, and kWh. Ballistic muzzle energy calculator from projectile mass and velocity with common cartridge comparison table.
Force and Mass Acceleration Calculator (F=ma)
Newton's second law F=ma calculator. Solve for force, mass, or acceleration with full unit conversions between N, kN, lbf, kg, lb, and more.
Free Fall Calculator
Calculate free fall distance, time, and velocity. Solve for any variable with optional initial velocity, planetary gravity comparison, and distance-time tables.
Free Fall Distance Calculator
Calculate how far an object falls in a given time under gravity. Distance-time tables, planetary comparisons, height equivalents bar chart, and energy analysis.
Free Fall Height Calculator
Calculate fall time and impact speed from height. Landmark comparisons, survivability guide, height-time-speed tables, and visual bar chart for famous structures.
Free Fall Time Calculator
Calculate how long an object takes to fall a given distance or reach a given velocity. Includes planetary comparison, distance-time tables, and timing visualization.
Free Fall Velocity Calculator
Calculate the velocity of a falling object from time or distance. Speed context chart, velocity build-up tables, Mach number, kinetic energy, and momentum analysis.
Free Fall with Air Resistance Calculator
Simulate free fall with drag using numerical integration. Calculate terminal velocity, real vs ideal fall distance, time-velocity tables, and compare drag profiles for different objects.
Friction Calculator
Calculate static and kinetic friction forces. Supports inclined surfaces, applied forces, material coefficient lookup table, angle analysis, and force diagrams.
Friction Coefficient Calculator
Determine the coefficient of friction from force measurements, inclined plane angle, or braking deceleration. Reference table, stopping distances, and classification scale.
Friction Factor Calculator (Darcy-Weisbach)
Calculate Darcy and Fanning friction factors for pipe flow. Moody chart calculation with Colebrook-White equation, Reynolds number, pipe material roughness, and head loss per meter.
Friction Force Calculator
Calculate friction force for flat and inclined surfaces with applied forces. Decompose weight into normal and parallel components, find if an object slides, and compare surface materials.
G-Force Calculator
Calculate g-force from linear acceleration, circular motion, or impact deceleration. Includes human tolerance reference, danger level assessment, and centripetal/impact analysis tables.
Gear Ratio & Speed Calculator
Calculate output speed, torque, and mechanical advantage from gear teeth counts. Supports single and compound gear trains with efficiency losses.
Gear Ratio Calculator
Calculate gear ratio from tooth counts, output speed and torque, mechanical advantage, and power transfer. Supports single and compound 2-stage gear trains with efficiency loss.
Gear Ratio RPM Calculator
Calculate output RPM from gear ratio and motor speed, find required ratio for a target RPM, or determine needed motor speed. Multi-stage support with standard motor speed reference.
Gravitational Force Calculator
Calculate gravitational force between two masses using Newton's law of universal gravitation F = Gm₁m₂/r². Includes escape velocity, orbital speed, and potential energy.
Ground Speed Calculator
Calculate aircraft ground speed from true airspeed, wind speed, and wind direction. Includes headwind/crosswind components and wind correction angle.
Hooke's Law Calculator
Calculate spring force, stiffness, or displacement using Hooke's Law F = kx. Supports series and parallel spring configurations with oscillation frequency.
Hoop Stress Calculator
Calculate hoop stress, axial stress, and Von Mises stress in thin-walled pressure vessels. Supports cylinders and spheres with safety factor analysis.
Impact Energy Calculator
Calculate impact energy from mass and drop height or velocity. Includes impact force, deceleration in g, dynamic load factor, and Charpy test reference data.
Impulse & Momentum Calculator
Calculate impulse, force, and velocity change using the impulse-momentum theorem J = FΔt = mΔv. Includes force-time trade-off visualization and sports examples.
Inclined Plane Calculator
Calculate forces on an inclined plane: normal force, parallel component, friction, net force, and acceleration. Supports applied forces and friction coefficients.
Inductor Energy Calculator
Calculate energy stored in an inductor using E = ½LI². Includes time constant, inductive reactance, impedance, and L/R current rise visualization.
Kinetic Energy Calculator
Calculate kinetic energy, mass, or velocity using KE = ½mv². Includes stopping distance, momentum, energy unit conversions, and speed comparison table.
Lever Calculator
Calculate effort force, load, fulcrum position, and mechanical advantage for all three lever classes. Includes torque balance and common lever examples.
Lift Coefficient Calculator
Calculate lift coefficient (C_L), lift force, and aerodynamic parameters from angle of attack, airspeed, wing area, and air density. Includes airfoil data table.
Linear Actuator Force Calculator
Calculate extend and retract forces for hydraulic and pneumatic cylinders from system pressure, bore diameter, and rod diameter. Includes friction loss and ISO bore sizes.
Lorentz Force Calculator
Calculate the Lorentz force F = q(E + v×B) on a charged particle in electric and magnetic fields. Includes cyclotron radius, frequency, and force decomposition.
Magnetic Force Between Wires Calculator
Calculate the magnetic force per unit length between two parallel current-carrying wires using F/L = μ₀I₁I₂/(2πd). Includes AWG reference table.
Magnetic Force on Wire Calculator
Calculate the force on a current-carrying wire in a magnetic field using F = BIL sin θ. Includes force-vs-angle chart and magnetic field reference table.
Magnitude of Acceleration Calculator
Calculate the magnitude of acceleration from x, y, z components or tangential and centripetal decomposition. Includes g-force conversion and reference table.
Magnus Force Calculator
Calculate the Magnus force on a spinning ball — deflection, spin parameter, and lateral acceleration for baseball, soccer, tennis, golf, and more. Includes sports reference table.
Mechanical Advantage Calculator
Calculate ideal and actual mechanical advantage for all six simple machines: lever, pulley, wedge, screw, wheel & axle, and inclined plane. Includes efficiency and work analysis.
Momentum Calculator
Calculate linear momentum (p = mv), elastic and inelastic collisions, kinetic energy transfer, and conservation of momentum. Includes collision type reference.
Muzzle Velocity Calculator
Estimate muzzle velocity from barrel length, powder charge, and bullet mass using energy balance or average pressure methods. Includes kinetic energy and cartridge reference.
Normal Force Calculator
Calculate the normal force on an object on a flat or inclined surface with optional applied force and friction. Includes force decomposition and friction reference.
Orbital Velocity Calculator
Calculate circular orbital velocity, period, and escape velocity for any altitude around Earth, Mars, Moon, Jupiter, Sun, or a custom body. Includes orbit types reference.
Particle Acceleration in Electric Field Calculator
Calculate the acceleration of charged particles (electrons, protons, alpha) in electric fields using F=qE and a=qE/m with energy and velocity outputs.
Particle Velocity (Maxwell-Boltzmann) Calculator
Calculate RMS, mean, and most probable molecular velocities from the Maxwell-Boltzmann distribution. Includes kinetic energy, mean free path, and gas speed reference.
Pendulum Frequency Calculator
Calculate pendulum frequency, period, and angular velocity for simple and physical pendulums. Includes large-angle correction, energy analysis, and period vs length chart.
Pendulum Kinetic Energy Calculator
Calculate kinetic and potential energy of a simple pendulum at any angle. Energy conservation, velocity, and height analysis.
Pendulum Period Calculator
Calculate the period of a simple pendulum using T = 2π√(L/g). Includes large-angle elliptic integral correction for valid inputs.
Photon Energy Calculator
Calculate photon energy from wavelength or frequency using E = hf = hc/λ. Results in eV and joules with EM spectrum comparison.
Physical Pendulum Calculator
Calculate the period of a physical (compound) pendulum using T = 2π√(I/mgd). Common shapes with moment of inertia presets.
Pipe Friction Loss Calculator (Darcy-Weisbach)
Calculate head loss and pressure drop in pipes using the Darcy-Weisbach equation. Compare pipe materials, sizes, and flow conditions for plumbing, HVAC, and hydraulic systems.
Piston Force Calculator
Calculate hydraulic and pneumatic piston force from pressure and bore diameter. Extend and retract forces with rod area correction.
Piston Speed Calculator
Calculate mean piston speed from stroke and RPM. Key engine performance metric for reliability and design limits.
Pneumatic Cylinder Force Calculator
Calculate pneumatic cylinder extend and retract force from air pressure and bore diameter. Includes rod area correction and air consumption.
Potential Energy Calculator
Calculate gravitational potential energy using PE = mgh. Includes height, mass solver, planetary comparison, and impact velocity.
Principal Stress Calculator
Calculate principal stresses σ₁, σ₂ from σ_x, σ_y, τ_xy using Mohr's circle. Von Mises, Tresca yield criteria and safety factors.
Pulley System Calculator
Calculate mechanical advantage, effort force, and rope length for pulley systems. Simple, compound, and block-and-tackle configurations.
Recoil Energy Calculator
Calculate firearm recoil energy from bullet mass, velocity, powder charge, and gun weight. Momentum conservation physics.
Relativistic Velocity Addition Calculator
Calculate relativistic velocity addition u = (v+w)/(1+vw/c²). Compare Einstein vs Galilean results with visual bars and Lorentz factors.
Resultant Force Calculator
Calculate the resultant of multiple concurrent forces using vector addition. Find magnitude, direction, and equilibrant force.
Resultant Velocity Calculator
Calculate resultant velocity from vector addition of object and medium velocities. Boat crossing river, airplane in wind scenarios.
RMS Speed Calculator
Calculate root-mean-square speed of ideal gas molecules from temperature and molar mass. Maxwell-Boltzmann distribution speeds.
Rotational Kinetic Energy Calculator
Calculate rotational kinetic energy from moment of inertia and angular velocity. Includes common shapes and flywheel energy storage.
Rotational Stiffness Calculator
Calculate torsional spring rate from torque and twist angle or shaft properties. Rotational stiffness for shafts, springs, and bushings.
Shear Modulus Calculator
Calculate shear modulus (G) from stress/strain or elastic constants. Includes bulk modulus and material comparison table.
Shear Strain Calculator
Calculate shear strain from lateral displacement and thickness or from shear stress and modulus. Visualize shear deformation.
Shear Stress Calculator
Calculate direct, beam, and torsional shear stress. Includes stress distribution, safety factors, and bolt sizing tables.
Shear Wave Velocity Calculator
Calculate shear wave speed from shear modulus and density. Compare S-wave, P-wave, and Rayleigh wave velocities across materials.
Simple Pendulum Calculator
Calculate simple pendulum period, frequency, energy, and speed. Includes exact large-angle correction and energy distribution analysis.
Specific Gravity Calculator
Calculate specific gravity, density, and API gravity. Convert between SG, kg/m³, and °API. Includes buoyancy analysis and 20+ substance reference.
Specific Impulse Calculator
Calculate rocket specific impulse, exhaust velocity, delta-V, and thrust. Compare 13 propellant types from cold gas to ion drives.
Speed of Light Calculator
Calculate speed of light in various media from refractive index. Travel time, wavelength shift, critical angle, and 16-medium comparison table.
Speed of Sound Calculator
Calculate speed of sound in ideal gases from temperature and properties. Mach number, travel time, and comparison across 10 gases and 15 solids/liquids.
Speed of Sound in Solids Calculator
Calculate the speed of longitudinal sound waves in solids using Young's modulus and density. Compare materials with acoustic impedance data.
Speeds and Feeds Calculator
Calculate CNC machining speeds and feeds: RPM, feed rate, material removal rate from material, tool diameter, and flutes. Metric and imperial.
Spring Calculator
Calculate spring force, displacement, energy storage, and stress. Supports compression, extension, and torsion springs in series and parallel.
Spring Rate Calculator
Calculate spring rate k = Gd⁴/(8D³N) from wire diameter, coil diameter, active coils, and material shear modulus. Includes stress analysis.
Stress Calculator
Calculate normal stress σ = F/A for tensile, compressive, bearing, and shear loading. Safety factor analysis with material yield strength comparison.
Stress Concentration Factor Calculator
Calculate stress concentration factor Kt for holes, fillets, notches, and grooves. Compare nominal vs. peak stress with fatigue notch factor.
Surface Tension Calculator
Calculate surface tension effects: capillary rise, droplet pressure, bubble pressure, and contact angle. Liquid database with comparison table.
Tension Calculator
Calculate tension in ropes and cables for hanging bodies, Atwood machines, inclined planes, and pulley systems. Free body diagram analysis.
Terminal Velocity Calculator
Calculate terminal velocity v_t = √(2mg/ρCdA) for objects falling through fluids. Skydiver, raindrop, and sports ball presets included.
Thermal Energy Calculator
Calculate heat energy (Q = mcΔT) for any material. Convert between joules, calories, BTU, and kWh with heating time estimates.
Thermal Stress Calculator
Calculate thermal stress (σ = EαΔT) in constrained members. Compare materials, find critical temperature change, and check yield safety factors.
Torsional Spring Calculator
Calculate torsional spring rate, deflection angle, bending stress, and stored energy. Built-in wire material database with safety factor analysis.
True Airspeed Calculator
Calculate true airspeed (TAS) from indicated airspeed, altitude, and temperature. Find Mach number, density altitude, and ISA deviation.
True Strain Calculator
Calculate true (logarithmic) strain vs engineering strain from specimen lengths. Compare strain measures with progressive table and stress conversion.
Velocity Calculator
Calculate velocity from distance and time or kinematic equations. Convert between m/s, km/h, mph, ft/s, and knots with reference comparisons.
Von Mises Stress Calculator
Calculate Von Mises equivalent stress from general or principal stresses. Compare with Tresca criterion, find safety factors for 7 materials.
Warp Speed Calculator
Convert Star Trek warp factors to multiples of light speed. Compare TOS and TNG scales with travel times to real astronomical destinations.
Wave Speed Calculator
Calculate wave speed, frequency, and wavelength using v = fλ. Supports sound waves, electromagnetic waves, and water waves with medium-specific speeds.
Wave Velocity Calculator
Calculate phase velocity and group velocity of waves. Explore dispersion in ocean waves, plasma, optical fiber, and custom media with frequency sweeps.
Wavelength to Energy Calculator
Convert between wavelength, frequency, and photon energy using E = hc/λ. Supports eV, Joules, kJ/mol, and wave number for the full electromagnetic spectrum.
Work and Power Calculator
Calculate mechanical power using P = W/t and P = Fv. Supports efficiency modeling, unit conversions (watts, hp, BTU/hr), and real-world power comparisons.
Work Calculator
Calculate work done by a force using W = Fd cos θ. Supports friction, inclined planes, and springs with energy unit conversions and angle-effect analysis.
Electromagnetism
88 calculatorsCircuit, capacitor, resistor, magnetic field, and electromagnetic wave calculators.
100 Amp Wire Size Calculator
Calculate the correct wire gauge for 100-amp circuits. NEC ampacity tables for copper and aluminum conductors with voltage drop analysis.
12V Wire Size Calculator
Calculate correct wire gauge for 12V DC systems. Automotive, solar, marine, and LED applications with voltage drop analysis.
220V Wire Size Calculator
Calculate wire gauge for 220/240V circuits. Size conductors for appliances, HVAC, EV chargers, and welders with NEC ampacity tables.
24V Wire Size Calculator
Calculate wire gauge for 24V systems. HVAC thermostats, landscape lighting, sprinkler valves, and access control with voltage drop limits.
3-Phase Motor Amperage Calculator
Calculate 3-phase motor full-load amps from HP, voltage, efficiency, and power factor. NEC Table 430.250 lookup and breaker sizing.
AC Wattage Calculator
Calculate AC power: real watts, reactive VAR, and apparent VA from voltage, current, and power factor. Single and 3-phase with cost estimation.
Acoustic Impedance Calculator
Calculate acoustic impedance Z = ρv, reflection and transmission coefficients at material boundaries. Includes material database for ultrasound.
Amp to Wire Size Calculator
Convert amperage to wire gauge using NEC ampacity tables. Copper and aluminum, temperature ratings, conduit fill, and ambient temperature derating.
Beat Frequency Calculator
Calculate beat frequency from two interfering waves. Visualize amplitude modulation, cents difference, and musical interval analysis.
Capacitance Calculator
Calculate capacitance for parallel plate, cylindrical, and spherical capacitors. Dielectric materials, stored charge, energy, and electric field.
Capacitive Reactance Calculator
Calculate capacitive reactance Xc = 1/(2πfC), impedance, phase angle, and cutoff frequency. Frequency response and standard capacitor tables.
Capacitive Transformerless Power Supply Calculator
Design a capacitive dropper transformerless power supply. Calculate X-rated capacitor, surge resistor, zener, and component ratings.
Capacitor Calculator
Calculate capacitor charge, energy, time constant, reactance, and series/parallel combinations. RC discharge curve and standard value reference.
Capacitor Charge Time Calculator
Calculate how long a capacitor takes to charge or discharge through a resistor to a target voltage. RC time constant, milestones, and curve.
Capacitor Size Calculator
Calculate the right capacitor size for power factor correction, motor start/run, DC filtering, and audio crossover applications.
Capacitors in Series Calculator
Calculate equivalent capacitance, voltage distribution, and energy for capacitors in series. Visual voltage distribution and per-capacitor breakdown.
Coefficient of Discharge Calculator
Calculate coefficient of discharge (Cd), theoretical and actual flow rates for orifices, nozzles, weirs, and Venturi meters.
Compton Wavelength Calculator
Calculate the Compton wavelength λ_C = h/(mc) for any particle. Explore Compton scattering angles, rest energies, and quantum length scales.
Conductivity to Resistivity Calculator
Convert between electrical conductivity (σ) and resistivity (ρ). Material database, temperature correction, %IACS, and wire resistance.
Critical Damping Calculator
Calculate critical damping coefficient, damping ratio, natural frequency, quality factor, and transient response for second-order systems.
Current Divider Calculator
Calculate branch currents in parallel resistor networks using the current divider rule. Supports any number of resistors with power analysis.
Cutoff Frequency Calculator
Calculate cutoff frequency for RC, RL, and RLC filters. Solve for any component value. Frequency response table and filter design.
Cyclotron Frequency Calculator
Calculate cyclotron (gyro) frequency, Larmor radius, and relativistic corrections for charged particles in magnetic fields.
Damping Ratio Calculator
Calculate damping ratio (ζ) from system parameters, peak amplitudes, or RLC values. Quality factor, settling time, and response analysis.
DC Wire Size Calculator
Calculate correct wire gauge for DC systems with voltage drop limits. Solar, battery, automotive, marine, and LED wire sizing.
De Broglie Wavelength Calculator
Calculate the de Broglie wavelength λ = h/p for any particle. Relativistic support, multiple input modes, energy scans, and scale comparisons.
Electric Field of a Point Charge Calculator
Calculate electric field E = kQ/r² for single or multiple point charges. Includes superposition, dielectric media, and field vs distance tables.
Faraday's Law EMF Calculator
Calculate induced EMF using Faraday's law of electromagnetic induction: ε = −NdΦ/dt. Supports flux, field, and motional EMF modes.
Frequency Bandwidth Calculator
Calculate bandwidth, Q factor, and cutoff frequencies for resonant circuits and filters. Frequency response table, RLC values, and selectivity analysis.
Frequency of Light Calculator
Calculate light frequency from wavelength using f = c/λ. Visible spectrum color mapping, photon energy in eV, wave number, and electromagnetic spectrum reference table.
Frequency to Wavelength Calculator
Convert frequency to wavelength for light, sound, and radio waves using λ = v/f. Supports EM waves, sound in air with temperature correction, and custom media.
Gauss's Law Calculator
Calculate electric flux and electric field using Gauss's law Φ = Q/ε₀. Supports spherical, cylindrical, and planar symmetries with dielectric materials.
Heat Capacity Calculator
Calculate heat energy Q = mcΔT, heat capacity, and heating time. Compare specific heats of common materials. Includes energy cost estimation and unit conversions.
Hohmann Transfer Orbit Calculator
Calculate Δv, transfer time, and propellant mass for Hohmann transfer orbits between two circular orbits. Supports Earth, Mars, Moon, and custom central bodies.
HP to Amps Calculator
Convert horsepower to amps for single-phase and three-phase motors. Accounts for motor efficiency and power factor. Includes NEMA reference tables.
Ideal Transformer Calculator
Calculate transformer voltage, current, and turns ratio using V₁/V₂ = N₁/N₂. Step-up, step-down, impedance matching. Includes efficiency and power loss.
Inductive Reactance Calculator
Calculate inductive reactance X_L = 2πfL, impedance, phase angle, and Q factor. Frequency response table shows how inductors behave across frequencies.
Internal Resistance Calculator
Find battery or source internal resistance from open-circuit and loaded voltage. Includes power loss, efficiency, short-circuit current, and maximum power transfer analysis.
J-Pole Antenna Calculator
Calculate J-pole antenna dimensions for any frequency. Get radiator length, stub length, gap, and feed point for VHF/UHF bands.
kVA to Amperage Calculator
Convert kVA to amps for single-phase and three-phase systems. Includes power factor, wire sizing, breaker selection, and power triangle.
LC Filter Calculator
Design LC low-pass and high-pass filters. Calculate inductance, capacitance, cutoff frequency, and Butterworth component values up to 5th order.
LED Resistor Calculator
Calculate the correct resistor value for any LED circuit. Supports series and parallel configurations, multiple LEDs, and nearest E24 standard values.
Magnetic Declination Calculator
Calculate magnetic declination for any location and date. Convert between true north and magnetic north bearings with compass correction.
Magnetic Dipole Moment Calculator
Calculate magnetic dipole moment, axial and equatorial fields, torque, and potential energy for current loops and coils.
Magnetic Field of Straight Wire Calculator
Calculate the magnetic field around a current-carrying wire using the Biot-Savart law. Supports infinite and finite wire models with permeability.
Magnetic Moment Calculator
Calculate magnetic moment, torque, and potential energy for current loops in external fields. Supports circular, square, and rectangular loops.
Magnetic Permeability Calculator
Calculate magnetic permeability, flux density, and core amplification. Compare diamagnetic, paramagnetic, and ferromagnetic materials.
MOSFET Threshold Voltage Calculator
Calculate MOSFET threshold voltage, drain current, operating region, transconductance, and overdrive voltage for NMOS and PMOS enhancement-mode transistors.
Natural Frequency Calculator
Calculate natural frequency, angular frequency, damping ratio, and period for spring-mass, pendulum, LC circuit, and cantilever beam systems.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power with Ohm's Law. Includes energy cost estimation, AWG wire gauge recommendation, complete formula reference table, and collapsible wire sizing chart.
Parallel Capacitor Calculator
Calculate total capacitance for 2-10 capacitors in parallel, with reactance, energy storage, charge, and comparison to series configuration.
Parallel Inductors Calculator
Calculate total inductance for 2-6 inductors in parallel, with current distribution, reactance, energy storage, and mutual coupling analysis.
Parallel Resistor Calculator
Calculate total resistance for 2-10 resistors in parallel, with current distribution, power budget, nearest E24 standard value, and series comparison.
Porosity & Permeability Calculator
Calculate flow rate, Darcy velocity, pore velocity, and hydraulic conductivity using Darcy's law for porous media. Includes Kozeny-Carman estimation.
RC Circuit Calculator
Calculate RC time constant, charging/discharging curves, frequency response, energy storage, and settling time for resistor-capacitor circuits.
RC Filter Calculator
Design low-pass and high-pass RC filters with cutoff frequency, frequency response table, gain/phase analysis, and multi-stage cascading support.
Resistor Color Code Calculator
Decode 4, 5, or 6-band resistor color codes to find resistance, tolerance, and temperature coefficient. Visual resistor diagram included.
Resistor Noise Calculator
Calculate Johnson-Nyquist thermal noise voltage and current for any resistor. Includes spectral density, SNR, and noise vs. bandwidth tables.
Resistor Wattage Calculator
Calculate power dissipated by a resistor and find the correct wattage rating. Includes derating curves, safety factors, and standard ratings.
Resonant Frequency (LC) Calculator
Calculate LC tank circuit resonant frequency, quality factor, bandwidth, and characteristic impedance. Includes frequency sweep table and Q factor visualization.
RLC Circuit Calculator
Analyze RLC series and parallel circuits. Calculate impedance, phase, resonant frequency, Q factor, damping ratio, and frequency response with voltage distribution tables.
RLC Impedance Calculator
Calculate RLC circuit impedance Z = √(R² + (X_L − X_C)²), phase angle, current, power factor, and voltage distribution with impedance triangle visualization.
RMS Voltage Calculator
Calculate RMS voltage from peak voltage for sine, square, triangle, sawtooth, and rectified waveforms. Includes form factor, crest factor, and waveform comparison table.
Rolling Resistance Calculator
Calculate rolling resistance force F = C_rr × N for vehicles. Includes tire type and surface material comparison, grade resistance, power requirements, and per-tire force breakdown.
Series Inductors Calculator
Calculate total inductance of series-connected inductors with optional mutual inductance. Supports up to 8 inductors with aiding/opposing coupling and parallel equivalent comparison.
Series Resistor Calculator
Calculate total resistance of series resistors with voltage division. Supports up to 8 resistors with voltage drops, power dissipation, and visual breakdown of each resistor.
SLED (Superluminescent LED) Calculator
Calculate SLED characteristics including spectral width, coherence length, power spectral density, coupling efficiency, and wall-plug efficiency with source comparison table.
Solenoid Inductance Calculator
Calculate solenoid inductance L = μ₀μᵣN²A/l with Nagaoka correction. Compare core materials, view scaling relationships, and compute magnetic field and stored energy.
Solenoid Magnetic Field Calculator
Calculate magnetic field B = μ₀nI inside a solenoid. Includes field intensity H, magnetic flux, inductance, stored energy, field strength scale, and parameter sensitivity table.
Sound Wavelength Calculator
Calculate sound wavelength from frequency or vice versa. Supports 9 media (air, water, steel, etc.), temperature correction, musical note presets, and a multi-media comparison table.
Spherical Capacitor Calculator
Calculate capacitance of a spherical capacitor from inner/outer radii and dielectric. Includes charge, energy, E-field, surface charge density, cross-section visual, and dielectric comparison table.
Thermal Resistance Calculator
Calculate thermal resistance for up to 6 stacked layers. Includes temperature profile, layer breakdown, heat flux, status indicator, and presets for CPU, LED, and MOSFET thermal paths.
Transformer Sizing Calculator
Size a transformer by specifying voltages, power, and frequency. Calculates turns ratio, core area product, wire gauge, flux density margin, and compares 5 core materials.
Voltage Divider Calculator
Calculate output voltage from R1/R2 or design resistor values for a target voltage. Features load analysis, E24 nearest values, tolerance sensitivity, ratio visual, and common presets.
Voltage Drop Calculator
Calculate voltage drop in electrical wiring by AWG, distance, current, and conductor material. NEC compliance check, AWG comparison table, power loss, and transmission efficiency.
Voltage Regulation Calculator
Calculate voltage regulation percentage, output impedance, and power loss. Measure mode analyzes supply quality; design mode computes LDO requirements. Includes regulation quality rating and load s...
Volts to Electron-Volts Calculator
Convert between electron-volts, joules, temperature, and photon wavelength. Includes voltage-to-energy conversion, particle rest mass table, relativistic speed calculation, and 10 energy units.
VSWR Calculator
Calculate VSWR, return loss, reflection coefficient, and mismatch loss. Input from VSWR, impedance, or return loss. Power distribution visual and comprehensive reference table.
Watt Calculator
Calculate electrical power in watts using multiple formulas: P=VI, P=I²R, P=V²/R, P=E/t, or P=τω. Includes energy cost estimation, unit conversions, and power scale comparison.
Watt Converter
Convert between 16 power units: watts, kilowatts, megawatts, horsepower (mechanical, metric, boiler), BTU/hr, dBm, dBW, calories/sec, and more. Log-scale power comparison visual.
Watt-Hours Calculator
Calculate energy in watt-hours from power and time, Ah and voltage, or estimate battery run time and required capacity. Includes DoD, efficiency, cost estimation, and battery comparison visual.
Watts to Amps Calculator
Convert watts to amps for DC, single-phase, and three-phase AC circuits. Includes power factor, NEC breaker sizing, wire gauge recommendation, voltage drop check, and appliance reference table.
Watts to Heat Calculator
Convert electrical power to heat output and calculate temperature rise in materials. Supports air, water, metals, oil. Includes heating rate, time to target temperature, timeline visual, and materi...
Watts to Lux Calculator
Convert electrical watts to illuminance (lux) or calculate watts needed for target lux. Supports 10 light sources, utilization/maintenance factors, lux scale visual, and source comparison table.
Wavelength Calculator
Calculate wavelength from frequency or frequency from wavelength. Supports all EM spectrum bands, refractive index, photon energy, wave number. Includes spectrum visual and reference table.
Wavelength to Frequency Calculator
Convert wavelength to frequency for any EM radiation. Supports pm to km, 8 wavelength units, photon energy, wave number, visible color identification. Includes spectrum visual and conversion tables.
Wire Resistance Calculator
Calculate wire resistance from AWG gauge or diameter, length, material, and temperature. Supports 7 conductor materials, temperature correction, cmil conversion. Includes temp effect visual and AWG...
Wire Size Calculator
Calculate the correct wire gauge (AWG) for any circuit. Factors in ampacity, voltage drop, NEC continuous load rule, conduit fill derating, and insulation rating. Includes NEC ampacity table and de...
Fluid Mechanics
22 calculatorsPressure, flow rate, buoyancy, viscosity, and hydraulic calculators.
Air Pressure at Altitude Calculator
Calculate atmospheric pressure, temperature, and air density at any altitude using the International Standard Atmosphere (ISA) model. Supports humidity correction.
BMEP Calculator (Brake Mean Effective Pressure)
Calculate brake mean effective pressure from power, displacement, and RPM. Compare engine efficiency across sizes. Supports kW, hp, 2-stroke and 4-stroke.
Cv Flow Calculator
Calculate liquid flow rate, required Cv, or pressure drop using Q = Cv√(ΔP/SG). Quick Cv sizing for valves, fittings, and regulators.
Darcy–Weisbach Calculator
Calculate pipe friction head loss and pressure drop with the Darcy–Weisbach equation. Uses the Colebrook–White equation for turbulent friction factor.
Darcy's Law Calculator
Calculate groundwater flow using Darcy's law Q = KiA. Compute Darcy velocity, seepage velocity, travel time, and total flow for any soil type.
Differential Pressure Calculator
Calculate flow rate from differential pressure across orifice plates, Venturi tubes, flow nozzles, and Pitot tubes. Converts ΔP to flow velocity and volume.
Hydraulic Conductivity Calculator
Calculate hydraulic conductivity K, Darcy velocity, seepage velocity, and total flow for soils and aquifers. Presets for gravel through clay.
Hydraulic Gradient Calculator
Calculate hydraulic gradient i = Δh/L from head drop and flow path length. Supports elevation + pressure mode, slope-angle conversion, and scenario presets.
Hydraulic Jump Calculator
Calculate downstream depth, energy loss, jump length, and power dissipated in a hydraulic jump. Supports rectangular, trapezoidal, and triangular channels.
Hydraulic Pressure Calculator
Calculate hydraulic cylinder force, speed, and power from pressure, bore, rod, and flow rate. Supports extend and retract calculations.
Hydraulic Radius Calculator
Calculate hydraulic radius Rh = A/P and hydraulic diameter Dh = 4A/P for circular, rectangular, trapezoidal, and triangular cross-sections.
Hydrostatic Pressure Calculator
Calculate pressure at depth P = P₀ + ρgh for any liquid. Converts to kPa, atm, psi, bar, and mmHg with force on surfaces.
Isentropic Flow Calculator
Calculate isentropic flow relations: T/T₀, P/P₀, ρ/ρ₀, A/A*, velocity, and normal-shock properties for any Mach number and gas.
Kinematic Viscosity of Air Calculator
Calculate kinematic viscosity ν, dynamic viscosity μ, and density of air at any temperature and pressure using Sutherland's law.
Manometer Calculator
Calculate pressure from manometer height difference for U-tube, differential, inclined, and well-type manometers with multiple manometer fluids.
Open Channel Flow Calculator (Manning)
Calculate flow rate, velocity, and Froude number in open channels using Manning's equation. Supports rectangular, trapezoidal, triangular, and circular shapes.
Orifice Flow Calculator
Calculate flow rate through an orifice using Q = CdA√(2gh). Supports sharp-edged, beveled, and rounded orifice types with multiple fluids.
Pipe Flow Calculator
Calculate velocity, Reynolds number, friction factor, head loss, and pressure drop for pipe flow. Includes elevation change and pumping power.
Radiation Pressure Calculator
Calculate radiation pressure, force, and acceleration from electromagnetic radiation on absorbing or reflecting surfaces. Solar sail and laser propulsion analysis.
Reynolds Number Calculator
Calculate the Reynolds number Re = ρVD/μ to classify pipe or external flow as laminar, transitional, or turbulent. Includes friction factor and entrance length.
Valve Flow Coefficient (Cv / Kv) Calculator
Calculate valve Cv, flow rate, or pressure drop for control valves. Convert between Cv (US) and Kv (metric) with specific-gravity correction.
Water Viscosity Calculator
Calculate dynamic viscosity, kinematic viscosity, density, and thermal properties of water at any temperature from 0–100 °C.
Thermodynamics
31 calculatorsHeat transfer, entropy, thermal expansion, and calorimetry calculators.
Absolute Humidity Calculator
Calculate absolute humidity from temperature and relative humidity. Find moisture content in grams per cubic meter for HVAC, weather, and climate analysis.
Altitude Temperature Calculator
Calculate temperature at any altitude using ISA lapse rate. Find atmospheric pressure, air density, and boiling point changes for aviation and mountaineering.
Black Hole Temperature Calculator
Calculate Hawking temperature of a black hole from its mass. Find event horizon radius, evaporation time, luminosity, and entropy using black hole thermodynamics.
BTU to Tons of Refrigeration Converter
Convert BTU/hr to tons of refrigeration and back. Calculate HVAC cooling capacity, energy costs, and efficiency ratings for air conditioning system sizing.
Calorimetry Calculator
Calculate heat exchange and final equilibrium temperature using Q = mcΔT. Solve calorimetry problems with material database and entropy calculations.
Carnot Efficiency Calculator
Calculate maximum Carnot efficiency for heat engines. Compare ideal vs actual efficiency, find COP for heat pumps, and analyze thermal power cycles.
Dew Point Calculator
Calculate dew point temperature from air temperature and relative humidity using the Magnus formula. Includes comfort scale, wet bulb, cloud base estimation.
Enthalpy Calculator
Calculate enthalpy using H = U + PV. Find enthalpy change, formation enthalpies, and combustion enthalpies with unit conversions and reference data.
Ideal Gas Density Calculator
Calculate gas density using ρ = PM/(RT). Find density of any gas from pressure, temperature, and molar mass with built-in gas database and unit conversions.
Ideal Gas Law Calculator (PV = nRT)
Solve PV = nRT for any variable. Calculate pressure, volume, moles, or temperature of ideal gases with full unit conversions and gas property calculations.
Ideal Gas Pressure Calculator
Calculate gas pressure using P = nRT/V. Find pressure from moles, temperature, and volume with multi-unit output and gas property calculations.
Ideal Gas Temperature Calculator
Calculate gas temperature using T = PV/(nR). Find temperature from pressure, volume, and moles with all temperature scales and molecular kinetics.
Ideal Gas Volume Calculator
Calculate gas volume using V = nRT/P. Find volume from moles, temperature, and pressure with multi-unit results and container size comparisons.
Joule Heating Calculator
Calculate resistive heating energy using Q = I²Rt. Find power dissipation, voltage drop, and wire properties for electrical heating applications.
Latent Heat Calculator
Calculate energy for phase changes using Q = mL. Find heat of fusion and vaporization for 10 substances with energy breakdowns and comparison tables.
Mixed Air Temperature Calculator
Calculate mixed air temperature from 2-3 airstreams in HVAC systems. Find weighted average temperature, flow fractions, and mass flow rates.
Psychrometric Calculator
Calculate psychrometric properties from dry-bulb and wet-bulb temperatures. Find RH, humidity ratio, enthalpy, dew point, and air density for HVAC design.
Relative Humidity Calculator
Calculate relative humidity from dry-bulb + wet-bulb, dew point, or absolute humidity. Find RH, humidity ratio, dew point, and enthalpy.
Sensible Heat Calculator
Calculate sensible heat transfer rate using Q = mass flow × cp × ΔT. Find heating/cooling loads in kW, BTU/h, and tons for HVAC and process engineering.
Specific Heat Calculator
Calculate specific heat capacity from Q, m, and ΔT. Solve for cp, energy, mass, or temperature with a 17-material database and comparison charts.
Stefan-Boltzmann Law Calculator
Calculate thermal radiation power using P = εσAT⁴. Find radiated power, net heat transfer, peak wavelength, and spectrum position for any temperature.
Thermal Conductivity Calculator
Calculate heat flow using Fourier law q = kAΔT/L. Find R-value, U-value, and heat flux for 14 materials with visual conductivity comparison.
Thermal Diffusivity Calculator
Calculate thermal diffusivity α = k/(ρcp), Fourier number, penetration depth, and characteristic time for 12 materials with visual comparison.
Thermal Efficiency Calculator
Calculate thermal efficiency for Carnot, Otto, Diesel, Brayton, and Rankine cycles. Compare actual vs ideal efficiency with energy flow visualization.
Thermal Equilibrium Calculator
Find the final equilibrium temperature when 2-5 bodies with different materials and temperatures reach thermal equilibrium. Visual convergence display.
Thermal Expansion Calculator
Calculate linear, area, and volumetric thermal expansion for 13 materials. Find ΔL = αLΔT, thermal stress, and compare CTE across materials.
Van der Waals Equation Calculator
Solve the van der Waals equation (P + an²/V²)(V − nb) = nRT for real gases. Find volume, compressibility factor Z, and compare with ideal gas behavior.
Virtual Temperature Calculator
Calculate virtual temperature Tv = T(1 + 0.61r) for moist air. Compare dry vs moist air density with humidity effects table and visualization.
Water Heating Calculator
Calculate energy, time, and cost to heat water for any volume. Supports 7 heater types, 4 energy prices, and common container comparison table.
Wet-Bulb Temperature Calculator
Calculate wet-bulb temperature from dry-bulb and relative humidity. Includes dew point, heat index, WBGT, heat stress risk assessment, and RH lookup table.
Wheatstone Bridge Calculator
Calculate unknown resistance using Rx = R3(R2/R1). Find bridge voltage, sensitivity, Thevenin equivalent, and explore balance conditions with visual diagram.
Optics
21 calculatorsLens, mirror, refraction, diffraction, and light intensity calculators.
Angle of Incidence Calculator
Calculate the angle of incidence using Snell's Law given refractive indices and angle of refraction. Includes Fresnel reflectance and Brewster angle.
Angle of Refraction Calculator
Calculate the angle of refraction using Snell's Law. Includes critical angle, Brewster angle, Fresnel reflectance, and a multi-angle comparison table.
Angular Resolution Calculator
Calculate angular resolution using the Rayleigh criterion, Dawes' limit, and Sparrow limit. Compare apertures and find minimum resolvable features.
Aperture Area Calculator
Calculate the area of circular apertures for telescopes, cameras, and optical systems. Compare f-stops, central obstruction, and light gathering power.
Brewster Angle Calculator
Calculate Brewster's angle for any two media. Includes polarization reflectance, angle comparison tables, and material reference data.
Contact Lens Vertex Distance Calculator
Convert spectacle prescription to contact lens power using vertex distance compensation. Handles sphere, cylinder, and rounding to 0.25 D steps.
Diffraction Calculator
Calculate diffraction patterns for single slit, double slit, diffraction grating, and circular aperture. Includes angle, fringe spacing, and order tables.
Hair Diffraction Calculator
Measure hair diameter using laser diffraction (Babinet's principle). Calculate fringe positions, pattern width, and classify hair type from diffraction data.
Index of Refraction Calculator
Calculate the refractive index from speed of light or Snell's Law angles. Includes material comparison, Brewster angle, critical angle, and wavelength data.
Laser Beam Divergence Calculator
Calculate laser beam divergence, spot size at distance, Rayleigh range, and far-field onset. Supports M² beam quality factor and distance tables.
Laser Beam Expander Calculator
Design Galilean and Keplerian beam expanders. Calculate output beam size, divergence reduction, lens focal lengths, and Rayleigh range improvement.
Laser Brightness Calculator
Calculate laser radiance (brightness), spectral radiance, intensity, beam parameter product, and M² factor. Supports CW and pulsed modes.
Laser Linewidth Calculator
Convert laser linewidth between frequency, wavelength, and wavenumber. Calculate coherence length, coherence time, quality factor, and cavity modes.
Laser Spot Size Calculator
Calculate focused laser spot size, depth of focus, intensity, and power density. Compare focal lengths and evaluate cutting/welding parameters.
Lensmaker's Equation Calculator
Use the lensmaker's equation to find focal length, optical power, and image distance from lens curvature, refractive index, and thickness.
Lumen Calculator
Convert between lumens, candela, lux, and foot-candles. Calculate luminous efficacy, illuminance at distance, and compare light sources.
Lux to Foot-Candle Calculator
Convert between lux and foot-candles. Calculate total lumens for an area, luminous exitance, and compare illuminance levels for different environments.
Mirror Equation Calculator
Calculate image distance, magnification, and image properties for concave and convex mirrors using the mirror equation 1/f = 1/d_o + 1/d_i.
Snell's Law Calculator
Apply Snell's law to find refraction angle, critical angle, Brewster's angle, and Fresnel reflectance at any optical interface.
Telescope Magnification Calculator
Calculate telescope magnification, exit pupil, true field of view, resolution limits, and light gathering power. Compare eyepieces and Barlow lenses.
Thin Lens Equation Calculator
Solve the thin lens equation 1/f = 1/d_o + 1/d_i for image distance, magnification, and image characteristics. Supports converging and diverging lenses.
Waves & Sound
9 calculatorsFrequency, wavelength, Doppler effect, and acoustic calculators.
dB Gain Calculator
Calculate decibel gain or loss between input and output power or voltage levels with cascade analysis, Neper conversion, and common dB reference table.
Doppler Effect Calculator
Calculate observed frequency for moving sources and observers with presets for air, water, and steel. Includes Mach number, beat frequency, and speed comparison table.
Harmonic Wave Equation Calculator
Compute displacement, velocity, and acceleration for traveling and standing harmonic waves. Includes wave profile tables, key relationships, and visual displacement indicator.
Mach Number Calculator
Calculate Mach number from velocity and altitude using the International Standard Atmosphere model. Includes flow regime classification, isentropic relations, and altitude comparison table.
Noise Figure Calculator
Calculate noise figure, noise factor, and noise temperature for single stages and cascaded receiver chains using the Friis formula. Includes sensitivity analysis and stage contribution breakdown.
Signal-to-Noise Ratio (SNR) Calculator
Calculate SNR in dB from signal and noise power levels. Includes Shannon capacity, ENOB, Eb/N₀, and application-specific requirement comparisons.
Simple Harmonic Motion Calculator
Calculate displacement, velocity, acceleration, and energy for simple harmonic oscillators. Supports spring-mass, pendulum, and damped systems with motion tables and energy visualization.
Sound Absorption Coefficient Calculator
Calculate sound absorption coefficient from incident and reflected power, or look up values from a 10-material database. Includes Sabine/Eyring reverberation time and RT60 target comparisons.
Wavenumber Calculator
Convert between wavenumber, wavelength, and frequency for electromagnetic and acoustic waves. Includes angular and spectroscopic wavenumber, photon energy, and EM spectrum classification.
Atmospheric pressure, wind chill, and weather-related physics calculators.
Calculators coming soon.
Astronomy
15 calculatorsOrbital mechanics, escape velocity, stellar luminosity, and planetary calculators.
Alien Civilization Calculator
Classify civilizations on the Kardashev scale, estimate energy budgets, project growth timelines, and explore Dyson sphere parameters.
Drake Equation Calculator
Estimate the number of communicating civilizations in the Milky Way using all seven Drake Equation factors with preset scenarios.
Earth Orbit Calculator
Calculate orbital distances, velocities, perihelion, aphelion, and seasonal solar declination for Earth or any planet.
Exoplanet Calculator
Characterize exoplanets — compute gravity, density, equilibrium temperature, habitability, and compare with known worlds.
Exoplanet Travel Planner Calculator
Plan interstellar journeys — calculate travel times, time dilation effects, energy requirements, and compare speeds for exoplanet destinations.
Gravitational Time Dilation Calculator
Calculate how gravity warps time using general relativity — compare clocks near massive objects, black holes, neutron stars, and Earth.
Hubble's Law Calculator
Calculate recession velocity, distance, and redshift using Hubble's Law. Compare Hubble constant values and explore the expanding universe.
Kepler's Third Law Calculator
Calculate orbital periods, distances, and central masses using Kepler's Third Law with solar system verification and unit conversions.
Length Contraction Calculator
Calculate relativistic length contraction at any fraction of the speed of light with visual comparisons, Lorentz factor tables, and speed references.
Light-Year Calculator
Convert between light-years, parsecs, AU, and km. Calculate light travel times and compare cosmic distances to known objects.
Luminosity Calculator
Calculate stellar luminosity from radius and temperature using the Stefan-Boltzmann law. Includes spectral classification and habitable zone estimates.
Orbital Period Calculator
Calculate the orbital period for any body orbiting a central mass. Includes solar system verification, unit conversions, and binary system mode.
Schwarzschild Radius Calculator
Calculate the event horizon radius of a black hole from its mass. Includes photon sphere, ISCO, Hawking temperature, and famous black hole comparisons.
Time Dilation Calculator
Calculate special relativistic time dilation from velocity. Find the Lorentz factor, dilated time, and compare effects at various speeds from walking to near-light.
Weight on Other Planets Calculator
Calculate your weight on every planet, moon, and dwarf planet in the solar system. Includes gravity comparison chart, jump height estimates, and planetary data.
Torque, angular velocity, moment of inertia, and centripetal force calculators.
Calculators coming soon.
Nuclear
6 calculatorsRadioactive decay, half-life, binding energy, and nuclear reaction calculators.
Bohr Model Calculator
Calculate orbital radius, energy levels, electron velocity, and photon wavelengths for hydrogen-like atoms using the Bohr model of the atom.
Compton Scattering Calculator
Calculate wavelength shift, scattered photon energy, and recoil kinetic energy for Compton scattering off electrons, protons, or muons.
Heisenberg Uncertainty Principle Calculator
Calculate minimum momentum, velocity, and energy uncertainties from the Heisenberg uncertainty principle for position–momentum and energy–time relations.
Photoelectric Effect Calculator
Calculate maximum kinetic energy, stopping voltage, and threshold wavelength for the photoelectric effect across 12 metals with multiple input modes.
Quantum Number Calculator
Analyze and validate sets of quantum numbers (n, l, mₗ, mₛ), explore subshell capacities, orbital nodes, and generate electron configurations using the Aufbau principle.
Rydberg Equation Calculator
Calculate spectral line wavelengths, photon energies, and wavenumbers using the Rydberg equation for hydrogen and hydrogen-like ions across all spectral series.
Time dilation, length contraction, mass-energy equivalence, and relativistic calculators.
Calculators coming soon.
General Physics
182 calculatorsDimensional analysis, unit conversion, and general physics reference calculators.
Air Density Calculator
Calculate air density from pressure, temperature, and humidity using the ideal gas law. Includes altitude reference table and moist air corrections.
Angle of Repose Calculator
Calculate the angle of repose for granular materials. Find pile height, volume, slope ratio, and stability from friction coefficient and density.
Angle of Twist Calculator
Calculate angle of twist, shear stress, and torsional stiffness for solid or hollow shafts under torque. Compare materials side by side.
Attenuation Calculator
Calculate signal attenuation through cables, fiber, or free space. Find total loss in dB, output power, and half-power distance with connector and splice losses.
Ballistic Coefficient Calculator
Calculate ballistic coefficient, sectional density, drag force, and muzzle energy for projectiles. Compare G1/G7 models with built-in presets.
Bank Angle Calculator
Calculate bank angle, turn radius, load factor, and turn rate for aircraft or vehicles in coordinated turns. Includes G-force and stall speed factor.
Barn-Pole Paradox Calculator
Explore the barn-pole (ladder) paradox of special relativity. Calculate Lorentz contraction, simultaneity gaps, and see why both frames give consistent but surprising results.
Belt Length Calculator
Calculate V-belt or flat belt length for two-pulley and crossed-belt drives. Find speed ratio, driven RPM, belt speed, and contact angle.
Bend Allowance Calculator
Calculate bend allowance, bend deduction, flat blank length, and outside setback for sheet metal bending. Supports multiple materials and K-factors.
Binoculars Range Calculator
Calculate exit pupil, twilight factor, field of view, and apparent target size for any binoculars. Compare models for birding, astronomy, and hunting.
Biot Number Calculator
Calculate the Biot number to determine if lumped capacitance analysis applies. Compare internal vs external thermal resistance for heat transfer problems.
Black Hole Calculator
Calculate Schwarzschild radius, Hawking temperature, photon sphere, ISCO, evaporation time, and time dilation for any black hole mass.
Blackbody Radiation Calculator
Calculate Wien peak wavelength, Stefan-Boltzmann power, Planck spectral radiance, and emission color for any temperature. Explore blackbody physics with star presets.
Blast Radius Calculator
Calculate blast overpressure zones, damage radii, and fireball size for explosions using Hopkinson-Cranz scaling. Educational physics tool.
Boltzmann Factor Calculator
Calculate Boltzmann factors, population ratios, and partition functions for two-level systems. Explore thermal physics with temperature and energy presets.
Boost Converter Calculator
Design a boost (step-up) DC-DC converter: calculate duty cycle, inductor current, ripple, critical inductance, and component stress for any input/output voltage.
Boyle's Law Calculator
Calculate final pressure or volume using Boyle's Law (P₁V₁ = P₂V₂). Supports kPa, atm, psi, bar, mmHg with isothermal work and compression ratio.
Bragg's Law Calculator
Calculate Bragg diffraction angle, d-spacing, or wavelength using nλ = 2d sin θ. Includes higher-order reflections, momentum transfer, and X-ray source reference.
Breaker Size Calculator
Calculate the correct circuit breaker size, wire gauge, voltage drop, and power loss for any electrical load. NEC-compliant with AWG wire reference table.
Bridge Rectifier Calculator
Design a full-wave bridge rectifier: calculate DC output voltage, ripple, capacitor sizing, PIV, diode current, and efficiency for any AC input.
Brinell Hardness Number Calculator
Calculate Brinell Hardness Number (BHN) from test force and indentation diameter. Includes material reference table and UTS estimation.
Broad-Crested Weir Calculator
Calculate discharge, critical depth, crest velocity, and Froude number for broad-crested weirs. Includes approach velocity correction, H/L validity, and Cd reference.
Buck Converter Calculator
Design a buck (step-down) DC-DC converter: calculate duty cycle, inductor ripple, critical inductance, efficiency, and component stress for any input/output voltage.
Bug-Rivet Paradox Calculator
Explore the bug-rivet (barn-pole) paradox of special relativity. Calculate Lorentz contraction, time dilation, and frame-dependent simultaneity for any speed.
Bulk Modulus Calculator
Calculate bulk modulus from pressure and volume changes or look up values for common materials. Includes compressibility and stiffness comparison chart.
Car Center of Mass Calculator
Calculate vehicle center of mass from front and rear axle weights. Weight distribution percentage, CG position, and weight transfer analysis.
Car Jump Distance Calculator
Calculate how far a car, motorcycle, or bike jumps off a ramp. Factors in launch angle, speed, ramp height, and landing elevation with trajectory analysis.
Carburetor CFM Calculator
Calculate the correct carburetor CFM sizing for any engine. Factors in displacement, RPM, volumetric efficiency, and barrel count with common carb reference.
Charles's Law Calculator
Calculate volume changes of a gas with temperature using Charles's Law (V₁/T₁ = V₂/T₂). Supports °C, °F, K with work done and gas law reference.
Circular Motion Calculator
Calculate centripetal acceleration, force, angular velocity, period, bank angle, and g-force for uniform circular motion. Covers cars, coasters, satellites, centrifuges.
Cloud Base Calculator
Estimate cloud base altitude from temperature and dewpoint spread or relative humidity. Includes AGL/MSL conversion, Henning formula, and pilot reference tables.
Compressibility Calculator
Calculate compressibility, bulk modulus, volume change, speed of sound, Mach number, and acoustic impedance for any material. Compare fluids, gases, and solids.
COP / Performance Coefficient Calculator
Calculate coefficient of performance for heat pumps, refrigerators, and air conditioners. Compare actual COP to Carnot limit with SEER/EER conversion.
Copper Wire Weight Calculator
Calculate the weight of copper wire by AWG gauge and length. Includes AWG reference table, resistance estimation, and material cost approximation.
Cosmological Redshift Calculator
Calculate redshift z from velocity or wavelengths. Compute recession velocity, Hubble distance, lookback time, scale factor, and CMB temperature at any epoch.
Crawl Ratio Calculator
Calculate your 4×4 crawl ratio from transfer case, transmission, and axle ratios. Includes wheel torque, tractive force, grade ability, and speed at RPM.
Crossover Calculator
Calculate audio crossover network component values for Butterworth and Linkwitz-Riley filters with 1st through 4th order designs.
Cube Density Calculator
Calculate the density of a cube from its side length and mass. Identify materials by comparing against a reference database of common substances.
Curie Constant Calculator
Calculate the Curie constant, paramagnetic susceptibility, and Weiss molecular field for ferromagnetic and paramagnetic materials.
Curie's Law Calculator
Calculate magnetic susceptibility using Curie's Law and the Curie–Weiss Law for paramagnetic and ferromagnetic materials at any temperature.
Cylinder Density Calculator
Calculate the density of a cylinder from diameter, height, and mass. Material identification, volume, surface area, and reference comparison table.
Daylight Calculator
Calculate sunrise, sunset, daylight hours, and twilight durations for any latitude and day of the year using solar position equations.
Debye Length Calculator
Calculate the Debye screening length for electrolytes, plasmas, and semiconductors. Determine electrostatic screening distances and ionic strength.
Decibel (dB) Calculator
Convert between decibels, power ratios, and voltage ratios. Combine sound levels, compare intensities, and explore dB scales.
Delta to Wye (Δ-Y) Calculator
Convert between delta (Δ) and wye (Y) resistor configurations for three-phase circuits with impedance ratios and power calculations.
Delta-v Calculator
Calculate rocket delta-v using the Tsiolkovsky equation. Determine propellant requirements, mass ratios, and mission feasibility for space travel.
Density Altitude Calculator
Calculate density altitude from pressure altitude, temperature, and dew point. Aviation and athletics performance tool with impact reference table.
Density Calculator
Calculate density from mass and volume with extensive unit conversions. Material database with 23+ substances for identification and comparison.
Density Mass Volume Calculator
Solve for any of density, mass, or volume using the triangle relationship ρ = m/V. Unit conversions, material database, and visual triangle display.
Density to Mass Calculator
Calculate mass from density and volume for cubes, spheres, cylinders, and boxes. Material database with comparison table for same-volume masses.
Density to Weight Calculator
Convert density and volume to weight in Newtons, pounds-force, and kgf. Supports Earth, Moon, Mars, and Jupiter gravity with material comparison.
Diopter Calculator
Calculate lens power in diopters, convert prescriptions between forms, compute focal lengths, and estimate contact lens power from spectacle Rx.
Dipole Moment Calculator
Calculate molecular dipole moments from charge and bond length. Convert between Debye, C·m, and esu·cm units with ionic character analysis.
Displacement Calculator
Calculate displacement, velocity, and acceleration using kinematic equations. Supports 1D and 2D motion with time-evolution tables.
Distance Attenuation Calculator
Calculate sound pressure level attenuation over distance for point and line sources with air absorption and atmospheric effects.
Distance to Horizon Calculator
Calculate how far you can see to the horizon based on observer elevation, atmospheric refraction, and target height using Earth geometry.
E = mc² Calculator
Calculate mass-energy equivalence using Einstein's famous equation. Convert between mass and energy with TNT, kWh, MeV, and other unit conversions.
Earth Curvature Calculator
Calculate the curvature drop, bulge, and hidden height of objects over distance on a spherical Earth with optional refraction correction.
Effectiveness-NTU Calculator
Calculate heat exchanger effectiveness using the ε-NTU method for counter-flow, parallel-flow, shell-and-tube, and crossflow configurations.
Efficiency Calculator
Calculate mechanical, electrical, or thermal efficiency from input and output power with energy cost analysis and COP for heat pumps.
EIRP Calculator
Calculate Effective Isotropic Radiated Power from transmitter power, antenna gain, and cable losses with link budget and power density analysis.
Electric Dipole Calculator
Calculate electric dipole fields, potentials, torque, and energy. Convert between C·m and Debye units with distance-dependent field analysis.
Electric Potential Calculator
Calculate electric potential, field strength, and potential energy for point charges with superposition, dielectric effects, and distance analysis.
Electrical Mobility Calculator
Calculate charge carrier mobility, drift velocity, conductivity, diffusion coefficient, and relaxation time in semiconductors and conductors.
Electrical Power Calculator
Calculate electrical power, current, voltage, and resistance with power factor correction, 3-phase support, energy cost analysis, and wire sizing.
Elongation Calculator
Calculate material elongation, stress, strain, and safety factor under tensile load using Hooke's law with force-elongation analysis.
Engine Displacement Calculator
Calculate engine displacement from bore, stroke, and cylinder count in cc, liters, and cubic inches with compression ratio and efficiency analysis.
Euler Buckling Calculator
Calculate Euler critical buckling load, Johnson formula, slenderness ratio, safety factor, and effective length for columns. Includes end-condition K factors.
Evaporation Rate Calculator
Calculate water evaporation rate from surface area, temperature, humidity, and wind speed with daily loss estimates and cooling power analysis.
Excess Electrons Calculator
Calculate total charge, surface potential, electric field, and electrostatic energy from excess electrons on a conductor with dielectric analysis.
Exhaust Diameter Calculator
Calculate exhaust pipe diameter from flow rate, temperature, and target velocity with standard pipe sizing, Reynolds number, and pressure drop analysis.
Factor of Safety Calculator
Calculate factor of safety from yield strength, ultimate strength, or buckling load with utilization ratio, margin of safety, and industry standard comparisons.
Fan Calculator
Calculate fan power, airflow, static pressure, brake horsepower, and energy cost with fan affinity laws, efficiency analysis, and RPM scaling.
Fermi Level Calculator
Calculate semiconductor Fermi level position, carrier concentrations, and intrinsic properties from band gap, doping, and temperature with band diagram visualization.
Flat vs Round Earth Distance Calculator
Compare distances calculated using flat-earth Euclidean projection versus spherical Haversine formula to see how curvature affects real-world navigation.
Flyback Converter Calculator
Design flyback converters by computing turns ratio, duty cycle, magnetizing inductance, peak currents, and component stress for isolated DC-DC power supplies.
Forward Converter Calculator
Design forward converter power supplies with turns ratio, duty cycle, output inductor, capacitor sizing, and MOSFET stress calculations.
Free Space Path Loss (FSPL) Calculator
Calculate free space path loss, received signal power, link margin, and maximum range for RF links using the Friis transmission equation.
Fresnel Zone Calculator
Calculate Fresnel zone radii, required clearance heights, and Earth bulge for line-of-sight radio, microwave, and optical links.
Froude Number Calculator
Calculate the Froude number for open-channel flow, ship hull speed, and hydraulic engineering to determine subcritical or supercritical flow regimes.
Fulcrum & Lever Calculator
Calculate torques, mechanical advantage, balance conditions, and required forces for first, second, and third class levers around a fulcrum.
Gas Density Calculator
Calculate ideal gas density from molar mass, temperature, and pressure using ρ = PM/(RT). Presets for 12 common gases with comparison chart.
Gay-Lussac's Law Calculator
Calculate pressure changes with temperature at constant volume using Gay-Lussac's Law (P₁/T₁ = P₂/T₂) for ideal gas behavior.
Generator Power Calculator
Calculate generator kVA, current, torque, fuel consumption, and mechanical input power for single-phase and three-phase electrical generators.
Gold Weight Calculator
Calculate gold weight in grams, troy ounces, and pennyweights. Karat purity analysis with value estimation for coins, bars, and jewelry.
Grams per cm³ Density Calculator
Convert between mass, volume, and density in g/cm³ (g/cc), kg/m³, and lb/ft³. Includes a material density reference table and buoyancy check.
Hall Coefficient Calculator
Calculate the Hall coefficient, Hall voltage, carrier concentration, and mobility for semiconductors and conductors in a magnetic field.
Helical Coil Inductance Calculator
Calculate the inductance, wire length, DC resistance, Q factor, and self-resonant frequency of a helical (solenoid) coil using the Nagaoka correction.
Helmholtz Resonator Calculator
Calculate the resonant frequency, Q factor, and bandwidth of a Helmholtz resonator from cavity volume and neck dimensions for acoustics and audio design.
High-Pass Filter Calculator
Design RC and RL high-pass filters by calculating cutoff frequency, gain, phase shift, rolloff rate, and frequency response table.
Hydrogen-Like Atom Calculator
Calculate energy levels, transition wavelengths, orbital radii, and spectral series for hydrogen-like atoms using the Bohr model.
Ideal Rocket Equation Calculator
Calculate delta-v, exhaust velocity, mass ratio, and propellant fraction using the Tsiolkovsky rocket equation with mission Δv comparisons.
Immersed Weight Calculator
Calculate apparent weight and buoyant force for objects submerged in any fluid. Archimedes principle with 9-fluid comparison and force-balance visual.
Insertion Loss Calculator
Calculate insertion loss in dB, power transmission percentage, cable loss, and signal budget for RF connectors, cables, splices, and components.
Interstellar Travel Calculator
Calculate relativistic travel times to nearby stars with constant acceleration or cruise speed. Includes time dilation, ship vs Earth time, and interstellar destination table.
Intrinsic Carrier Concentration Calculator
Calculate intrinsic carrier concentration (ni), Fermi level, and thermal voltage for semiconductors like Si, Ge, and GaAs at any temperature.
Inverse Square Law Calculator
Calculate how light, sound, radiation, or gravity intensity changes with distance using the inverse square law, with dB change and distance tables.
Inverting Buck-Boost Converter Calculator
Design an inverting buck-boost converter by calculating duty cycle, inductance, output capacitance, switch stress, and power budget.
Kg to Newtons Calculator
Convert mass in kilograms to weight in newtons on Earth, Moon, Mars, Jupiter, and other planets with force unit conversions.
Knudsen Number Calculator
Calculate the Knudsen number to determine gas flow regime — continuum, slip, transition, or free molecular — from mean free path and characteristic length.
kVA Calculator
Calculate kVA, kW, kVAR, current, and power factor for single-phase and three-phase electrical systems with power triangle visualization.
Lightning Distance Calculator
Calculate how far away lightning struck from the flash-to-thunder delay, with safety zone assessment, storm tracking, and temperature-corrected speed of sound.
LMTD Calculator
Calculate the log mean temperature difference (LMTD) for heat exchangers in counterflow and parallel flow, with required area and effectiveness.
Low-Pass Filter Calculator
Design RC and RL low-pass filters by calculating cutoff frequency, gain, phase shift, rolloff rate, rise time, and frequency response table.
Malus's Law Calculator
Calculate the intensity of polarized light after passing through an analyzer at any angle using Malus's law, with multi-polarizer chain analysis.
Mass to Density Calculator
Calculate density from mass and volume, or solve for any variable in ρ = m/V. Material identification with 12-material comparison scale.
Mean Free Path Calculator
Calculate the mean free path of gas molecules from temperature, pressure, and molecular diameter, with collision frequency and gas property tables.
Mixed Air Calculator
Calculate mixed air temperature, humidity, enthalpy and dew point when two airstreams combine in HVAC systems, with mixing ratio sweep table.
Mixing Ratio of Air Calculator
Calculate humidity mixing ratio, specific humidity, absolute humidity, dew point, enthalpy, and moist air density from temperature, RH, and pressure.
Modulation Calculator
Calculate AM, FM, and PM modulation index, bandwidth (Carson's rule), sideband frequencies, carrier power, and efficiency for radio signals.
Mohr's Circle Calculator
Calculate principal stresses, max shear stress, and rotated stress components using Mohr's circle. Includes Von Mises and Tresca failure criteria.
MOSFET Calculator
Calculate MOSFET drain current, operating region, power dissipation, transconductance, and thermal estimates for N-channel and P-channel devices.
NE555 Astable Calculator
Calculate 555 timer astable frequency, duty cycle, period, and component values. Includes reverse design from target frequency and E24 resistor matching.
Newton's Law of Cooling Calculator
Calculate temperature over time, time to reach a target temperature, or find the cooling constant using Newton's law of cooling with exponential decay.
Newton's Second Law Calculator
Calculate force, mass, or acceleration using F = ma. Includes friction, incline, kinematics, momentum, kinetic energy, and G-force analysis.
Newton's Third Law Calculator
Analyze action-reaction force pairs in collisions, contact forces, and gravitational interactions. Computes impulse, momentum, G-force, and kinetic energy.
NPSH Calculator
Calculate Net Positive Suction Head Available (NPSHa) to prevent pump cavitation. Includes vapor pressure table, margin analysis, and max suction lift.
Number Density Calculator
Calculate particle number density n = N/V from particle count, pressure and temperature, or mass density. Log-scale comparison from interstellar space to solids.
Nusselt Number Calculator
Calculate the Nusselt number, Reynolds, Prandtl, heat transfer coefficient for pipe flow and flat plate using Dittus-Boelter and Gnielinski correlations.
Oblique Shock Calculator
Calculate oblique shock wave angle, downstream Mach number, pressure/density/temperature ratios, and stagnation pressure loss for supersonic flow.
Olbers' Paradox Calculator
Explore why the night sky is dark despite infinite stars. Calculate sky coverage, mean free path to stars, redshift dimming, and effective brightness fraction.
Optical Density Calculator
Calculate optical density, transmittance, and absorbance using Beer-Lambert law. ND filter comparison table with f-stop equivalents for photography.
Poise & Stokes Viscosity Converter
Convert between dynamic (Poise, Pa·s, cP) and kinematic (Stokes, cSt, mm²/s) viscosity units. Includes Saybolt conversion and common fluid reference table.
Poiseuille's Law Calculator
Calculate laminar flow rate, pressure drop, velocity profile, and flow resistance in cylindrical tubes using Poiseuille's equation. Essential for blood flow and pipe sizing.
Poisson's Ratio Calculator
Calculate Poisson's ratio from strain, moduli pairs, or direct input. Derives shear and bulk modulus with 14-material comparison table.
Polar Moment of Inertia Calculator
Calculate polar moment of inertia J for solid/hollow shafts, square and rectangular tubes. Compute shear stress, twist angle, and torsional stiffness.
Pounds per Minute Flow Converter
Convert mass flow rate between lb/min, kg/s, GPM, L/min, and m³/h. Includes pipe velocity estimation and quick conversion reference table.
Power Dissipation Calculator
Calculate electrical power dissipation, junction temperature, and thermal derating from voltage, current, and resistance. Includes package thermal reference table.
Prandtl Number Calculator
Calculate the Prandtl number from fluid properties. Compare thermal and momentum diffusivities, boundary layer ratios, and regime classification for heat transfer analysis.
Prandtl-Meyer Expansion Calculator
Calculate Prandtl-Meyer expansion fan properties: downstream Mach number, isentropic pressure/temperature/density ratios, and PM function values.
Propeller Pitch Calculator
Calculate propeller pitch speed, tip speed, tip Mach number, advance ratio, and pitch angle for RC, drone, aircraft, and boat propellers.
Propeller Slip Calculator
Calculate propeller slip percentage from pitch speed and actual speed. Estimate efficiency and compare to typical slip ranges for aircraft, boats, and drones.
PSI Pressure Converter
Convert pressure between PSI, kPa, bar, atm, mmHg, inHg, and more. Calculate force on area and water depth equivalent with reference table.
Quarter-Mile Calculator
Estimate quarter-mile ET and trap speed from horsepower and weight. Includes 0-60, 1/8 mile, drivetrain loss, altitude correction, and drag racing records.
Radar Horizon Calculator
Calculate radar line-of-sight horizon distance from antenna and target heights. Includes atmospheric refraction (k-factor), Fresnel zone, and target height lookup table.
Reduced Mass Calculator
Calculate reduced mass μ = m₁m₂/(m₁+m₂) for two or three bodies. Supports kg, amu, electron masses with reference table of common systems.
Refrigerant Capillary Tube Calculator
Size capillary tubes for refrigeration systems. Calculate required length and diameter from cooling capacity, refrigerant type, and operating temperatures.
Relativistic Kinetic Energy Calculator
Calculate relativistic kinetic energy from velocity or vice versa. Compute Lorentz factor, momentum, total energy, time dilation, and classical KE error.
Reverberation Time (RT60) Calculator
Calculate RT60 reverberation time using Sabine and Eyring equations. Add room surfaces with absorption coefficients, assess speech intelligibility, and reference α values.
Rocket Thrust Calculator
Calculate total rocket thrust from mass flow rate, exhaust velocity, and nozzle pressures. Includes Isp, thrust coefficient, and propellant comparison table.
Rockwell Hardness Conversion Calculator
Convert between Rockwell C, Rockwell B, Vickers, and Brinell hardness scales with tensile strength estimation using ASTM E140 conversion data.
SCFM Calculator
Convert between SCFM and ACFM for compressed air systems. Accounts for temperature, pressure, and humidity corrections with pipe sizing reference.
Shaft Size Calculator
Calculate minimum shaft diameter from torque or power/RPM with shock factors, hollow shaft support, and material comparison table.
Shockley Diode Equation Calculator
Calculate diode current from voltage using the Shockley equation. Includes ideality factor, thermal voltage, dynamic resistance, and I-V sweep mode.
SiPM / PDE Calculator
Calculate SiPM photon detection efficiency, fired microcells, saturation, signal-to-noise ratio, and dark count correction for silicon photomultiplier sensors.
Skin Depth Calculator
Calculate electromagnetic skin depth for conductors at any frequency. Includes AC resistance ratio, shielding depth, and material comparison table.
Slenderness Ratio Calculator
Calculate column slenderness ratio, Euler buckling stress, and AISC design capacity for various cross sections and end conditions.
Smartphone Projector Calculator
Calculate projected image size, brightness, and lens placement for a DIY smartphone projector. Includes lens comparison and contrast analysis.
Space Travel Time Calculator
Calculate interstellar travel time with constant acceleration, time dilation, and energy requirements. Includes relativistic proper time and destination reference.
Specific Gas Constant Calculator
Calculate the specific gas constant, cp, cv, density, and speed of sound for any gas. Includes comprehensive gas property reference table.
Sphere Density Calculator
Calculate the density of a sphere from its diameter and mass, or find mass or diameter given density. Includes material matching and moment of inertia.
Stellar Parallax Calculator
Convert stellar parallax to distance in parsecs, light-years, and AU. Compute absolute magnitude, luminosity, and distance modulus with Gaia-era accuracy.
Stiffness Matrix Calculator
Generate element stiffness matrices for spring, truss, and beam elements in FEA. Visualizes the matrix with DOF labels and material properties.
Stokes Law Calculator
Calculate terminal settling velocity and drag force for spherical particles in viscous fluids. Includes Reynolds number check and multi-fluid comparison.
Stopping Distance Calculator
Calculate total stopping distance from speed, reaction time, road friction, and grade. Includes speed comparison table and surface friction reference.
Sun Angle Calculator
Calculate solar altitude, azimuth, zenith angle, and shadow length for any location, date, and time. Includes hourly sun path table.
Sunrise Calculator
Calculate sunrise, sunset, day length, and civil twilight for any location and date. Includes monthly sunrise/sunset table and polar day/night detection.
Sunset Calculator
Calculate sunset time, twilight phases, golden hour, and monthly sunset table for any location. Includes civil, nautical, and astronomical twilight.
SUVAT Calculator
Solve any SUVAT kinematics equation — enter 3 of 5 variables (s, u, v, a, t) and calculate the remaining two. Includes velocity profile and motion table.
Synodic Period Calculator
Calculate the synodic period between two orbiting bodies. Includes angular velocity, alignment frequency, and planetary synodic period reference table.
Telescope Field of View Calculator
Calculate true field of view, magnification, exit pupil, and resolving power for any telescope and eyepiece combination. Includes eyepiece comparison table.
Thermodynamic Processes Calculator
Calculate work, heat, internal energy change, and entropy for isothermal, isobaric, isochoric, and adiabatic processes. Includes energy balance visualization.
Thin Film Optics Calculator
Calculate reflectance, transmittance, and spectral response of thin film optical coatings. Includes AR coating design, spectral plot, and material reference.
Thrust-to-Weight Ratio Calculator
Calculate thrust-to-weight ratio (TWR) for rockets, aircraft, and drones. Includes multi-engine support, gravity selection, acceleration, and payload estimates.
TNT Equivalent Calculator
Convert between energy (joules, kWh, calories) and TNT equivalent mass. Includes blast radius estimation and explosion reference table.
Toilet Paper Race & Moment of Inertia Calculator
Race different rolling objects down a ramp. Calculate moment of inertia for solid and hollow cylinders, spheres, and toilet paper rolls. See which shape wins!
Torsional Constant Calculator
Calculate the torsional constant (J) for solid circles, hollow tubes, rectangles, and I-beams. Includes shear stress, twist angle, and formula reference.
Torsional Stiffness Calculator
Calculate torsional stiffness (k = GJ/L) for shafts, springs, and torsion bars. Includes deflection, natural frequency, and length comparison table.
Transistor Biasing Calculator
Calculate BJT operating point (Ic, Vce, Vb, Ve) for voltage divider, collector feedback, and emitter feedback biasing. Includes β sensitivity table.
Transmission Calculator
Calculate gear ratios, output RPM, torque multiplication, and power loss for single and two-stage gear trains with efficiency. Includes automotive gear reference.
Twist Rate Calculator
Calculate rifle barrel twist rate stability using Greenhill and Miller formulas. Includes bullet RPM, stability factor, and twist comparison table.
Universe Expansion Calculator
Calculate Hubble recession velocity, redshift, lookback time, and Hubble tension for cosmic distances. Includes notable cosmic objects reference table.
Vickers Hardness Number Calculator
Calculate Vickers hardness (HV) from force and diagonal measurements. Convert to Rockwell, Brinell, and tensile strength with material identification.
Volume to Density Calculator
Calculate density from volume and mass with shape-based volume input, material identification, specific gravity, and buoyancy analysis for 22+ materials.
Volume to Mass Calculator
Convert volume to mass using material density. Supports 30+ materials, 5 shape modes, and multiple unit systems with weight comparison tables.
Water Density Calculator
Calculate water density at any temperature (0–100°C), salinity, and pressure. Includes anomalous expansion, viscosity, speed of sound, and density vs temperature table.
Wien's Law Calculator
Calculate peak wavelength from temperature (or vice versa) using Wien's displacement law. Includes spectral distribution, Stefan-Boltzmann power, and color visualization.
Wind Correction Angle Calculator
Calculate wind correction angle (WCA), ground speed, crosswind, headwind/tailwind components for aviation navigation. Includes wind direction comparison table.
Wind Load Calculator
Calculate wind pressure and force on structures using ASCE 7 methodology. Includes exposure categories, height profile, and speed comparison table.
Wing Loading Calculator
Calculate wing loading, aspect ratio, lift coefficients, and stall speed at bank angles. Includes aircraft reference table from paragliders to fighters.
Y+ (Y-Plus) Wall Distance Calculator
Calculate first cell height for CFD mesh y⁺ requirements. Includes Reynolds number, friction velocity, boundary layer region guide, and y⁺ reference table.
Young's Modulus Calculator
Calculate Young's modulus from stress and strain, force and extension, or derive stress/strain from known E. Includes material database and unit conversion.