Unit Conversion Calculators
Free unit conversion calculators — length, weight, volume, temperature, speed, area and more with instant results.
Exact conversion factors — not rounded approximations — for length, weight, volume, temperature, speed and data. Each converter shows the factor it applies and the reverse direction, so a millimetre that matters stays precise instead of drifting through chained approximations.
Length Converter
Convert between length units
Weight Converter
Convert between weight units
Volume Converter
Convert between volume units
Area Converter
Convert between area units
Speed Converter
Convert between speed units
Data Storage Converter
Convert between data units
Angle Converter
Convert between angle units
Energy Converter
Convert between energy units
Pressure Converter
Convert between pressure units
Frequency Converter
Convert between frequency units
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Time Converter
Convert time units (hours, minutes, seconds)
Force Converter
Convert force units (N, kN, lbf)
Fuel Efficiency Converter
Convert fuel economy (MPG, L/100km)
Cooking Measurement Converter
Convert cooking measurements
Clothing Size Converter
Convert international clothing sizes
Shoe Size Converter
Convert international shoe sizes
Currency Converter (Fixed Rate)
Convert currencies at fixed rates
Torque Converter
Convert torque units (Nm, lb-ft)
Power Converter
Convert power units (W, kW, HP)
Electrical Unit Converter
Convert electrical units info
Radiation Converter
Convert radiation measurement units
Density Converter
Convert density units
Viscosity Converter
Convert viscosity units
Bit Rate Converter
Convert data rates between bps, Kbps, Mbps, Gbps
Luminance Converter
Convert between lux, foot-candles, nits
Molarity Converter
Convert concentration between M, mM, µM, nM
Flow Rate Converter
Convert between L/s, L/min, m³/h, GPM
Paper Size Converter
A/B-series paper sizes and dimensions
Fraction ↔ Percent ↔ Decimal
Convert between fraction, percent, and decimal
Roman Numeral Converter
Convert between Arabic numbers and Roman numerals
PPM / Concentration Converter
Convert between ppm, ppb, and percent
Thermal Conductivity Converter
Convert W/(m·K) to BTU/(ft·h·°F) etc
Radiation Dose Converter
Convert between Gray, rad, Sievert, rem
Wire Gauge (AWG) Converter
Convert AWG to mm and mm²
Acceleration Converter
m/s², g-force, ft/s², km/h per second