Unit Converter

Choose what you are converting, enter a value and pick the units.

Result

Enter values and press Calculate to see the result.

Formula

1 in=2.54 cm,1 lb=0.45359237 kg1\ \text{in} = 2.54\ \text{cm},\quad 1\ \text{lb} = 0.45359237\ \text{kg}

US and imperial units are defined exactly in metric units, so conversions are exact before rounding.

°F=°C×95+32°F = °C \times \tfrac{9}{5} + 32

Temperature scales have different zero points, so they use a formula rather than a single factor.

How to use this calculator

  1. Choose the kind of quantity, then the units to convert from and to.
  2. US customary units are used for cups, pints and gallons.

Worked example

Convert 1 mile to kilometres

1 mile is exactly 1609.344 metres.

So 1 mile = 1.609344 km.

Frequently asked questions

Are gallons US or UK?

US gallons (3.785411784 L). A UK gallon is 4.54609 L.

How accurate is it?

Conversion factors are exact definitions; the only rounding is to the decimal places you choose.