Angle Converter
Convert angles between degrees, radians, gradians, turns, and arcminutes. Uses the exact formula radians = degrees × π/180.
Free Measurement Calculators
25 toolsArea, speed, pressure, energy, data, and sizing converters. Browse our free measurement tools below — no sign-up required.
Area Converter
Convert between square feet, square meters, acres, hectares, and more for real estate, land measurement, and construction planning.
ASCII & Unicode Lookup
Look up ASCII and Unicode code points for any character. Convert between characters, decimal, hex, octal, and binary values.
Binary to Decimal Converter
Convert binary numbers to decimal, hexadecimal, and octal. Shows step-by-step positional calculation for learning purposes.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, AU, and JP systems for men and women. Includes tops, bottoms, and dresses.
Color Converter
Convert colors between Hex, RGB, and HSL formats. Enter any color format and see all equivalents with a live preview swatch.
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB in both binary (1024) and decimal (1000) systems.
Energy Converter
Convert between joules, calories, kilowatt-hours, BTU, and electron-volts with one energy converter.
Flow Rate Converter
Convert flow rates between GPM, LPM, cubic meters per hour, CFM, and liters per second. Uses the exact factor 1 GPM = 3.78541 LPM.
Force Converter
Convert force between Newtons, pound-force, kilogram-force, dynes, and kilo-Newtons. Uses the exact factor 1 N = 0.2248 lbf.
Frequency Converter
Convert frequency between Hz, kHz, MHz, GHz, and THz. Each step scales by 1000. Also shows period in seconds and milliseconds.
Fuel Economy Converter
Convert fuel economy between MPG, L/100km, and km/L. Supports US MPG, UK MPG, and metric fuel economy standards.
Hex to Decimal Converter
Convert hexadecimal numbers to decimal and binary. Supports uppercase and lowercase hex digits with step-by-step calculation.
Hex to RGB Converter
Convert hexadecimal color codes to RGB values. Supports 3-digit and 6-digit hex with a live color preview swatch.
Octal to Decimal Converter
Convert octal (base-8) numbers to decimal, hexadecimal, and binary. Shows step-by-step positional expansion for easy learning.
Paper Size Reference
Look up paper dimensions for A series, B series, US Letter, Legal, and Tabloid. Shows sizes in mm, inches, and points.
Power Converter
Convert between watts, kilowatts, horsepower, BTU/hr, and foot-pounds per second for equipment sizing and power comparisons.
Pressure Converter
Convert between Pascal, bar, psi, atm, mmHg, and torr for tire pressure, lab readings, HVAC work, and engineering reference.
RGB to Hex Converter
Convert RGB color values to hexadecimal color codes for CSS and HTML. Enter red, green, and blue values to get the hex code.
Ring Size Converter
Convert ring sizes between US, UK, EU, and JP systems. Shows inner circumference and diameter in millimeters for accurate sizing.
Screw Size Reference
Look up screw dimensions by designator. Shows major diameter, threads per inch, pitch, and head sizes for common screw types.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and JP systems for men and women. Includes foot length in cm and inches.
Speed Converter
Convert between mph, km/h, m/s, knots, and more for driving, aviation, science, and athletics.
Torque Converter
Convert torque between Newton-meters, foot-pounds, inch-pounds, and kilogram-force-meters. Uses the exact factor 1 Nm = 0.7376 ft·lb.
Wire Gauge Converter
Convert AWG wire gauge to diameter in mm and inches, cross-sectional area in mm², and resistance per meter. Covers 0000 to 40 AWG.