Unit Converters100% Free21 tools

Free Unit Converters for Every Measurement

Convert length, area, volume, weight, temperature, speed, pressure, energy, power, data size, time and more. Every converter shows the answer and the value in every other unit.

Length and area

Length ConverterConvert metres between 19 units. Area ConverterConvert square metres between 12 units.

Volume and mass

Volume ConverterConvert cubic metres between 17 units. Weight and Mass ConverterConvert kilograms between 13 units. Density ConverterConvert kilogram per cubic metres between 8 units.

Temperature and speed

Temperature ConverterConvert kelvins between 4 units. Speed ConverterConvert metre per seconds between 7 units.

Pressure, energy and power

Pressure ConverterConvert pascals between 10 units. Energy ConverterConvert joules between 11 units. Power ConverterConvert watts between 8 units. Force ConverterConvert newtons between 6 units. Torque ConverterConvert newton metres between 6 units. Flow Rate ConverterConvert litre per minutes between 7 units.

Angle, time and frequency

Angle ConverterConvert degrees between 7 units. Time ConverterConvert seconds between 12 units. Frequency ConverterConvert hertzs between 8 units.

Data and computing

Data Storage ConverterConvert bytes between 12 units. Fuel Economy ConverterConvert litres per 100 kms between 4 units.

Light and radiation

Illuminance ConverterConvert luxs between 6 units. Radioactivity ConverterConvert becquerels between 8 units. Radiation Dose ConverterConvert sieverts between 7 units.

How These Unit Converters Work

Every converter on this site runs in your browser with JavaScript. The numbers you type are processed on your own device. Nothing is uploaded, stored or logged, and no outside service is involved.

Each tool stores its units as multiples of one reference unit, such as the metre or the kilogram. A conversion multiplies into the reference unit and divides out into the target unit, so any pair of units works, and a table shows the same value in every unit.

Which Converter Should I Use?

Travel and shopping: try the length converter, the weight converter and the temperature converter.
Cooking and home: use the volume converter, the power converter and the energy converter.
Cars and engines: see the fuel economy converter, the torque converter and the pressure converter.
Computers: use the data storage converter and the frequency converter.

More free tools are in our math calculators, text tools and website tools. The units themselves are defined by the International Bureau of Weights and Measures.