Units

Unit Converter

Convert length, mass, temperature, area, volume, energy, and more.

Free to use — no sign-up or login.

From

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This free Unit Converter covers Convert length, mass, temperature, area, volume, energy, and more.

Enter the Unit Converter fields, then read the output. Units calculators on this site keep the formula visible beside the form, with no account required.

Using the Unit Converter

Convert length, mass, temperature, area, volume, energy, and more. Fill the labeled fields on the Unit Converter and read the result. The formula stays in How it works rather than being repeated here.

Worked example

Length: 1 meter = 3.28084 feet (scale through meters as the base). Temperature is not a single factor: 0 °C = 32 °F = 273.15 K using the offset formulas in How it works.

\[ 1\,\mathrm{m}=3.28084\,\mathrm{ft};\quad 0^{\circ}\mathrm{C}=32^{\circ}\mathrm{F} \]

FAQ

Why is temperature different from length?

Length and mass conversions are proportional. Celsius, Fahrenheit, and Kelvin differ by slope and offset, so you cannot multiply by one constant the way you convert meters to feet.

Where are single-family converters?

Dedicated pages (for example area or length converters) live under the Converters hub. This tool keeps several families in one UI.

Sources

https://en.wikipedia.org/wiki/Conversion_of_units

How it works

Unit conversion expresses the same physical quantity in a different measuring system. Most families use proportional factors; temperature uses offset-and-scale relationships.

For length and mass, convert to a shared base unit, then scale to the target unit.

\[ x_{\text{to}} = x_{\text{from}} \times \frac{f_{\text{from}}}{f_{\text{to}}} \]
Temperature scales are related by linear transforms. Celsius, Fahrenheit, and Kelvin differ by both slope and offset.

\[ ^{\circ}\!F = ^{\circ}\!C \times \tfrac{9}{5} + 32 \]
Kelvin is Celsius shifted by absolute zero.

\[ K = ^{\circ}\!C + 273.15 \]

Reference → Tutorial: How to Convert Units → Formula sheet: Units formulas →