One Converter for Everyday Units

Recipes in cups, tyre pressure in psi, a download size in GiB, a run in miles: units get in the way all the time. Pick a category, type a value and choose the units. The result updates as you type, and a table shows the same value in every unit of the category.

• Ten categories: Length, weight/mass, temperature, area, volume, speed, time, data size, pressure and energy.
• Data sizes done right: Decimal units (kB, MB, GB) and binary units (KiB, MiB, GiB) are listed separately and clearly labeled.
• All units at once: See the value in every unit of the category without changing the selection.
• Clean numbers: Results show up to 10 significant digits, with exponent notation for very large or very small values.

How accurate are the conversions?

Exact Factors Where They Exist

Many units are defined exactly in terms of metric ones: 1 inch is exactly 0.0254 m, 1 pound is exactly 0.45359237 kg and 1 US gallon is exactly 3.785411784 L. The converter uses these definitions, so converting back and forth returns the value you started with.

Temperature Uses Formulas

Celsius, Fahrenheit and Kelvin do not share a zero point, so they cannot be converted with a simple factor. The tool uses the standard formulas: 100 °C is 212 °F and 373.15 K, and -40 is the same in Celsius and Fahrenheit.

Frequently Asked Questions