FormatCalc library
Unit converters
without the noise.
Convert common measurements across metric, US customary, imperial, scientific, and specialist units. Results use defined factors, while clothing and shoe sizes remain approximate because brands use different fits. Choose a tool below to get started—no account required.
Length Converter
Convert between common metric, imperial, and nautical lengths.
Weight Converter
Convert metric and imperial mass units.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin, and Rankine.
Area Converter
Convert metric and imperial area units.
Volume Converter
Convert metric, US customary, and imperial volume units.
Speed Converter
Convert metric, imperial, and nautical speed units.
Time Converter
Convert milliseconds through weeks.
Angle Converter
Convert degrees, radians, gradians, turns, and arcminutes.
Data Storage Converter
Compare decimal and binary data-storage units.
Data Transfer Rate Converter
Convert common bit and byte transfer rates.
Pressure Converter
Convert pascals, bar, psi, atmospheres, and millimeters of mercury.
Energy Converter
Convert joules, calories, watt-hours, and BTU.
Power Converter
Convert watts, horsepower, and BTU per hour.
Force Converter
Convert newtons, pounds-force, kilogram-force, and dynes.
Torque Converter
Convert metric and imperial torque units.
Density Converter
Convert common metric and imperial density units.
Frequency Converter
Convert hertz, metric frequencies, and revolutions per minute.
Fuel Economy Converter
Convert US and imperial MPG, liters per 100 km, and km/L.
Typography Unit Converter
Convert CSS typography units using a configurable base font size.
Cooking Measurement Converter
Convert common US cooking volume measurements.
Shoe Size Converter
Estimate adult shoe sizes from US, UK, EU, or foot length.
Clothing Size Converter
Estimate common international women’s clothing sizes.
Acceleration Converter
Convert metric, imperial, and standard-gravity acceleration units.
Flow Rate Converter
Convert common metric, US, and imperial volumetric flow rates.
Illuminance Converter
Convert lux, phot, nox, and foot-candles.
Viscosity Converter
Convert common dynamic-viscosity units.
Electrical Unit Converter
Convert SI prefixes for voltage, current, resistance, and capacitance.
Coordinate Converter
Convert latitude and longitude between decimal degrees and DMS.