Actual Yield Calculator
Calculate actual yield from theoretical yield and percent yield. Determine real product amounts accounting for reaction efficiency and side reactions.
Free Chemistry Calculators
103 toolsWork through molar mass, equation balancing, molarity, reaction yield, and solution chemistry with calculators built for students, lab technicians, and chemists.
Stoichiometry
17 calculatorsMolar mass, mole conversion, limiting reagent, and yield calculators.
Atom Economy Calculator
Calculate atom economy for chemical reactions. Measure reaction efficiency by comparing useful product mass to total reactant mass for green chemistry.
Avogadro's Number Calculator
Convert between moles, particles, atoms, molecules, and formula units using Avogadro's number (6.022 × 10²³). Essential stoichiometry tool.
Chemical Equation Balancer Calculator
Balance chemical equations by entering reactants and products. Get stoichiometric coefficients, molar ratios, and conservation of mass verification.
Grams to Moles Calculator
Convert grams to moles and moles to grams using molar mass. Supports all elements and common compounds with an extensive molecular weight database.
Molar Mass Calculator
Calculate molar mass from chemical formulas with parentheses support and all 118 elements. Includes grams-to-moles conversion, composition breakdown, percent bars, and common compound presets.
Molar Ratio Calculator
Calculate molar ratios between reactants and products in chemical reactions. Determine stoichiometric proportions for any balanced equation.
Molarity Calculator
Calculate molarity, moles, volume, or mass of solute for solution preparation. Includes dilution calculations and common solution recipes.
Mole Calculator
Universal mole converter: between moles, grams, particles, and volume of gas at STP. Complete stoichiometry conversion tool for chemistry.
Mole Fraction Calculator
Calculate mole fractions for mixtures and solutions. Determine composition, partial pressures, and colligative property inputs from component moles.
Molecular Weight Calculator
Calculate molecular weight from chemical formula. Supports elements, compounds, hydrates, and polymers with a full periodic table database.
Moles to Atoms Calculator
Convert moles to atoms, molecules to atoms, and grams to atoms. Calculate total atom counts in compounds with multi-atom molecules.
Percent Composition Calculator
Calculate the percent composition by mass of each element in a chemical compound. Essential for empirical formula determination and analytical chemistry.
Percent Yield Calculator
Calculate percent yield from actual and theoretical yields. Compare reaction efficiency across conditions, identify limiting reagents, and benchmark synthesis performance.
Percentage Concentration to Molarity Calculator
Convert weight/volume percent, weight/weight percent, and volume/volume percent concentrations to molarity. Includes density and dilution support.
PPM to Molarity Calculator
Convert parts per million (ppm), parts per billion (ppb), and mg/L to molarity. Essential for environmental chemistry, water quality, and trace analysis.
Theoretical Yield Calculator
Calculate theoretical yield from limiting reagent, stoichiometry, and molar masses. Compare reagents, identify excess, and plan synthesis quantities.
Solutions
18 calculatorsMolarity, dilution, osmolarity, and concentration calculators.
Alligation Calculator
Calculate mixing ratios and volumes for blending two solutions of different concentrations using the alligation method.
Bleach Dilution Calculator
Calculate how much bleach and water to mix for any target ppm concentration. Covers CDC, WHO, and EPA disinfection guidelines.
Buffer Capacity Calculator
Calculate buffer capacity (β), efficiency, and the amount of acid or base needed to shift pH for any buffer system at a given concentration.
Buffer pH Calculator
Calculate the pH of any buffer solution using the Henderson-Hasselbalch equation. Supports common buffer systems and custom pKa values.
Concentration Calculator
Convert between molarity, g/L, ppm, ppb, and percent concentration. Calculate the mass of solute needed for any solution.
Degree of Unsaturation Calculator
Calculate the degree of unsaturation (DoU / IHD) from a molecular formula. Determine double bonds, triple bonds, and rings.
Dilution Factor Calculator
Calculate dilution factors, volumes, and multi-step dilution protocols. Convert between stock and final concentrations with step-by-step guidance.
Hydrogen Ion Concentration Calculator
Convert between pH, [H⁺], and [OH⁻]. Calculate hydrogen and hydroxide ion concentrations from pH or vice versa.
Mass Percent Calculator
Calculate mass percent (w/w%), mass fraction, and ppm from solute and solution masses or from molarity and density.
Molality Calculator
Calculate molality (mol/kg), convert to molarity, and compute colligative properties like boiling point elevation and freezing point depression.
Normality Calculator
Calculate normality (N), equivalent weight, and milliequivalents. Convert between normality and molarity for acid-base and redox reactions.
Osmotic Pressure Calculator
Calculate osmotic pressure using π = iMRT. Convert between atm, kPa, mmHg, and psi. Determine osmolarity and tonicity for biological solutions.
Percent Solution Calculator
Calculate w/v%, v/v%, and w/w% solution concentrations. Convert between percent types and determine the amount of solute for any target volume.
Protein Solubility Calculator
Estimate protein solubility based on pH, pI, ionic strength, and temperature. Assess precipitation risk and salt effects for protein solutions.
Raoult's Law Calculator
Calculate vapor pressure lowering, partial pressures, and vapor phase composition using Raoult's law for ideal solutions.
Serial Dilution Calculator
Calculate multi-step serial dilution protocols with concentrations, volumes, and visual pipelines. Supports CFU, cells, µg/mL, and molar units.
Solution Dilution Calculator
Use the C₁V₁ = C₂V₂ dilution equation to solve for any unknown. Calculate stock volume, final volume, or concentration for any dilution.
Titration Calculator
Calculate equivalence point volume, pH, and indicator selection for acid-base and redox titrations. Includes titration curve data.
Reaction rate, equilibrium constant, and enthalpy calculators.
Calculators coming soon.
Organic
1 calculatorMolecular formula, degree of unsaturation, and functional group calculators.
Carbon Dating Calculator
Calculate the age of organic samples using radiocarbon (¹⁴C) dating with half-life decay, percent modern carbon, and calibrated BP age ranges.
Electrochemistry
3 calculatorsCell potential, Faraday law, and electrode calculators.
Electrolysis Calculator
Calculate mass deposited, current required, time, and energy consumption for electrolysis using Faraday's laws with common plating and industrial applications.
Electromotive Force (EMF) Calculator
Calculate standard cell potential (EMF) from electrode potentials, predict reaction spontaneity, and determine Gibbs free energy for electrochemical cells.
Nernst Equation Calculator
Calculate non-standard cell potentials using the Nernst equation with concentration, temperature, and pH effects on electrode and cell potentials.
Nuclear Chemistry
1 calculatorRadioactive decay, half-life, and nuclear binding energy calculators.
Radioactive Decay Calculator
Calculate remaining quantity, half-life, decay constant, activity, and time elapsed for radioactive isotopes with visual decay curves and dose estimation.
Analytical
4 calculatorsTitration, Beer-Lambert law, and analytical chemistry calculators.
Beer-Lambert Law Calculator
Calculate absorbance, transmittance, molar absorptivity, concentration, and path length using the Beer-Lambert law for spectrophotometry.
Calibration Curve Calculator
Build a calibration curve from standard data, perform linear regression, and determine unknown concentrations with R² and confidence intervals.
Chemical Oxygen Demand Calculator
Calculate COD from titration data, estimate organic load, convert between COD/BOD/TOC, and assess wastewater treatment requirements.
Crude Protein Calculator
Calculate crude protein content from Kjeldahl nitrogen analysis with conversion factors for different food types and feed ingredients.
General Chemistry
33 calculatorsIdeal gas law, density, and general chemistry reference calculators.
Activity Coefficient Calculator
Calculate activity coefficients using the Debye-Hückel equation for electrolyte solutions. Determine ion activity from ionic strength and charge.
Air-Fuel Ratio (AFR) Calculator
Calculate stoichiometric and actual air-fuel ratios for combustion reactions. Determine equivalence ratio, lambda, and excess air percentage.
Boiling Point at Altitude Calculator
Calculate the boiling point of water at any altitude. Determine atmospheric pressure and cooking time adjustments for high elevations.
Boiling Point Calculator
Calculate boiling points using the Clausius-Clapeyron equation. Determine how boiling point changes with pressure for any substance.
Boiling Point Elevation Calculator
Calculate boiling point elevation for solutions using the colligative property formula. Determine ΔTb from molality and van't Hoff factor.
Chemical Name Calculator
Convert between chemical names, molecular formulas, and IUPAC nomenclature. Look up common and systematic names for chemical compounds.
Detention Time Calculator
Calculate hydraulic detention time for reactors, tanks, and treatment systems. Determine volume or flow rate from residence time requirements.
Double Bond Equivalent Calculator
Calculate the degree of unsaturation (DBE) from molecular formula. Determine the number of rings and double bonds in organic compounds.
Effective Nuclear Charge Calculator
Calculate effective nuclear charge (Zeff) using Slater's rules. Determine shielding constants and electron penetration for any element.
Enzyme Activity Calculator
Calculate enzyme activity, specific activity, and turnover number. Convert between enzyme units, katal, and specific activity measurements.
Freezing Point Depression Calculator
Calculate freezing point depression using the colligative property equation. Find molality, van't Hoff factor, and new freezing point for solutions.
Hydraulic Retention Time Calculator
Calculate hydraulic retention time (HRT) for water and wastewater treatment reactors. Design CSTR, PFR, and activated sludge systems.
Ionic Strength Calculator
Calculate ionic strength of electrolyte solutions. Supports multi-ion systems, activity coefficients, and Debye-Hückel corrections.
Isoelectric Point (pI) Calculator
Calculate the isoelectric point of amino acids and peptides from pKa values. Estimate net charge at any pH for proteins and amphoteric molecules.
Kp Calculator (Equilibrium Constant in Pressure)
Calculate the equilibrium constant Kp from partial pressures. Convert between Kp and Kc using the ideal gas law. Find Δn and reaction quotient Qp.
Langmuir Isotherm Calculator
Calculate Langmuir adsorption isotherm parameters. Find maximum adsorption capacity, equilibrium constant, and separation factor from experimental data.
Liquid Ethylene Density Calculator
Calculate the density of liquid ethylene at various temperatures and pressures. Includes saturation properties, compressibility, and phase behavior.
Michaelis-Menten Equation Calculator
Calculate enzyme kinetics using the Michaelis-Menten equation. Find Vmax, Km, and reaction velocity from substrate concentration data.
Miller Indices Calculator
Calculate Miller indices (hkl) for crystal planes and directions. Convert intercepts to Miller indices, find d-spacing, and explore lattice geometry.
Mixing Ratio Calculator
Calculate mixing ratios for solutions, gases, and compounds. Find final concentration, volume needed, and dilution factors for laboratory and industrial mixing.
Net Ionic Equation Calculator
Write net ionic equations from molecular equations. Identify spectator ions, strong vs weak electrolytes, and precipitation reactions automatically.
Percent Ionic Character Calculator
Calculate the percent ionic character of a bond from electronegativity difference and dipole moment. Compare predicted vs measured ionic character for common bonds.
Q10 Temperature Coefficient Calculator
Calculate the Q10 temperature coefficient for chemical and biological reaction rates. Find how reaction speed changes with temperature for enzymes and metabolic processes.
Reaction Quotient (Q) Calculator
Calculate the reaction quotient Q and compare with equilibrium constant K to predict reaction direction. Supports Qc, Qp, and ICE table analysis.
Reconstitution Calculator
Calculate the correct volume of solvent to reconstitute lyophilized powders, drugs, antibodies, and reagents to the desired concentration.
Resuspension Calculator
Calculate the correct buffer volume to resuspend cell pellets, beads, nanoparticles, and precipitates to the desired density or concentration.
Saponification Value Calculator
Calculate the saponification value of oils, fats, and waxes. Convert between SAP values, KOH/NaOH amounts, and fatty acid composition for soap making and quality control.
Standard Temperature and Pressure (STP) Calculator
Convert gas volumes, moles, and masses between STP, SATP, NTP, and custom conditions. Uses the ideal gas law and real gas corrections for valid measurements.
Total Dissolved Solids (TDS) Calculator
Calculate TDS from conductivity, estimate water hardness, compare mineral content against drinking standards, and convert between TDS units for water quality analysis.
Vapor Pressure Calculator
Calculate vapor pressure using the Antoine, Clausius-Clapeyron, and Raoult equations. Convert between units, estimate boiling points, and analyze solution vapor pressures.
Vapour Pressure of Water Calculator
Calculate the saturation vapour pressure of water at any temperature using the Buck, Magnus, Tetens, and Goff-Gratch equations. Includes dew point, humidity, and psychrometric conversions.
Water Hardness Calculator
Convert between water hardness units (mg/L CaCO₃, gpg, dGH, mmol/L, Clark degrees, French degrees). Calculate from Ca²⁺ and Mg²⁺ concentrations and classify water hardness.
Young-Laplace Equation Calculator
Calculate pressure difference across curved interfaces using the Young-Laplace equation. Supports bubbles, droplets, capillary rise, meniscus curvature, and contact angle calculations.
Thermochemistry
9 calculatorsEnthalpy, entropy, Gibbs energy, and reaction energy calculators.
Activation Energy Calculator
Calculate activation energy using the Arrhenius equation with two-temperature rate data. Supports Ea from rate constants, frequency factor estimation, and temperature dependence analysis.
Arrhenius Equation Calculator
Solve the Arrhenius equation for rate constant, activation energy, frequency factor, or temperature. Includes Arrhenius plot data and multi-temperature analysis.
Combustion Analysis Calculator
Determine empirical and molecular formulas from combustion analysis data. Enter masses of CO₂ and H₂O produced to find percent composition and molecular formula.
Combustion Reaction Calculator
Calculate heat released, oxygen required, and products formed in combustion reactions. Supports hydrocarbons, alcohols, and custom organic fuels with complete/incomplete combustion.
Entropy Calculator
Calculate entropy change for chemical reactions, phase transitions, and mixing processes. Covers ΔS°rxn from standard molar entropies and Boltzmann entropy.
Equilibrium Constant Calculator
Calculate equilibrium constant Kc, Kp, and reaction quotient Q. Determine equilibrium concentrations, predict reaction direction, and convert between Kc and Kp.
Gibbs Free Energy Calculator
Calculate Gibbs free energy (ΔG) from enthalpy and entropy, determine spontaneity, and find equilibrium temperatures. Supports ΔG°rxn from formation data and ΔG = ΔH - TΔS.
Heat of Combustion Calculator
Calculate standard enthalpy of combustion for fuels and organic compounds. Compare higher and lower heating values, energy density, and CO₂ intensity across fuels.
Rate Constant Calculator
Calculate reaction rate constants from experimental data for zero, first, and second order reactions. Determine reaction order, half-life, and rate law parameters.
Atomic & Molecular
8 calculatorsAtomic mass, electron configuration, bond order, and crystal structure calculators.
Atom Calculator
Explore atomic structure: find protons, neutrons, electrons, mass number, and isotope notation for any element. Includes ion charges, isotope data, and periodic table reference.
Atomic Mass Calculator
Look up atomic masses for all 118 elements. Calculate formula masses, convert between amu and grams, and explore mass defect and nuclear binding energy.
Average Atomic Mass Calculator
Calculate the weighted average atomic mass from isotope masses and abundances. Supports 2-6 isotopes with automatic normalization and visual abundance charts.
Bond Order Calculator
Calculate bond order from molecular orbital theory. Enter bonding and antibonding electrons, view MO diagrams, bond type, magnetic properties, and comparison tables.
Cubic Unit Cell Calculator
Calculate density, packing efficiency, atomic radius, and cell parameters for simple cubic (SC), body-centered cubic (BCC), and face-centered cubic (FCC) unit cells.
Electron Configuration Calculator
Generate electron configurations for all 118 elements. Shows orbital filling, noble gas core notation, orbital diagrams, valence electrons, and quantum number sets.
Electronegativity Calculator
Compare electronegativity values across Pauling, Mulliken, and Allred-Rochow scales. Predict bond polarity, bond type, and dipole moments from electronegativity differences.
Lattice Energy Calculator
Calculate lattice energy using the Born-Landé equation. Compare ionic compounds, explore Madelung constants, and understand crystal energetics with the Born-Haber cycle.
Acids & Bases
6 calculatorspH, pKa, Henderson-Hasselbalch, and neutralization calculators.
Gibbs Phase Rule Calculator
Calculate degrees of freedom using Gibbs Phase Rule (F = C - P + 2). Determine variance for any system with multiple components and phases, with interactive phase diagram examples.
Henderson-Hasselbalch Calculator
Calculate buffer pH using the Henderson-Hasselbalch equation. Determine pH from pKa and concentration ratio, or solve for any variable. Includes buffer capacity and common buffer recipes.
Neutralization Reaction Calculator
Calculate volumes, concentrations, and heat of neutralization for acid-base reactions. Supports strong/strong, strong/weak, and polyprotic acid reactions with stoichiometry.
pH Calculator
Calculate pH, pOH, [H⁺], and [OH⁻] from any one value. Includes strong/weak acid-base calculations, dilution, and a visual pH scale with common substance comparisons.
pKa Calculator
Convert between pKa and Ka, calculate conjugate pKb, predict acid strength, and compare acid-base properties. Includes a database of common acids with pKa values and polyprotic acid support.
Two-Photon Absorption Calculator
Calculate two-photon absorption cross-sections, excitation wavelengths, action cross-sections, and fluorescence rates. Covers GM units, power density, and comparison of TPA fluorophores.
Gas Laws
3 calculatorsPartial pressure, diffusion, and gas behavior calculators.
Diffusion Coefficient Calculator
Calculate diffusion coefficients for gases and liquids using Stokes-Einstein, Chapman-Enskog, and Wilke-Chang equations with temperature dependence.
Graham's Law of Diffusion Calculator
Calculate relative diffusion and effusion rates of gases using Graham's law with molecular weight comparisons, isotope separation, and gas identification.
Partial Pressure Calculator
Calculate partial pressures of gases in mixtures using Dalton's law, mole fractions, vapor pressure corrections, and real gas adjustments.