Units, Measurement & Converters Calculators

Convert length, weight, temperature, speed, area and more.

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Length ConverterConverts lengths exactly between metric, imperial and nautical units — with the international…

Speed ConverterConverts speeds exactly between m/s, km/h, mph, knots and ft/s, with an optional pace mode…

Temperature ConverterConvert temperature instantly between Celsius, Fahrenheit and Kelvin with this free,…

Area ConverterConvert area between units like square metres, square feet and acres instantly with this free…

All Units, Measurement & Converters Calculators (17)

Guide to Units Calculators

This hub converts between physical quantities that trip people up because the same word hides different bases: "weight" spans mass and force, "power" and "energy" get muddled, and fuel economy inverts (litres/100 km falls as MPG rises). It serves students checking coursework, tradespeople and engineers reconciling metric and imperial spec sheets, and makers sizing screens, paper or torque.

Everyday size, weight and temperature

Reach for these for cooking, travel, shipping and school work — the common metric/imperial swaps most people need day to day.

Length Converter Weight Converter Temperature Converter Area Converter Volume Converter Speed Converter

Mechanical and engineering quantities

Use these when a spec sheet or datasheet is involved; note force (newtons), pressure (pascals/psi), torque (Nm) and power vs energy are distinct quantities that do not interconvert.

Force Converter Pressure Converter Torque Converter Power Converter Energy Converter

Motion, angles and fuel

Pick fuel economy when comparing MPG against litres/100 km (they move in opposite directions), speed for travel, and angle for degrees, radians or gradians in geometry and surveying.

Fuel Economy Converter Speed Converter Angle Converter

Digital, print and display

Specialist converters for makers and designers: data storage for file and drive sizes, PPI for screen sharpness, and GSM for paper stock weight.

Data Storage Converter Screen PPI Calculator Paper Weight (GSM) Calculator Time Converter

Important calculation notice

These calculators are intended for education, estimation and preliminary checks. Verify all inputs, units, assumptions, material properties and applicable standards. Safety-critical or final engineering designs should be checked by a suitably qualified professional.

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