Common unit conversions
Unit conversion is one of the most frequent everyday calculations. This tool handles length, weight and temperature.
Handy reference values
- 1 inch = 2.54 centimetres
- 1 foot = 30.48 centimetres
- 1 mile = 1.609 kilometres
- 1 kilogram = 2.205 pounds
- 1 ounce = 28.35 grams
Temperature is different
Temperature scales do not simply multiply. Water freezes at 0°C or 32°F and boils at 100°C or 212°F, so the conversion includes an offset. Use the temperature option to get the right answer.
Frequently asked questions
How many cm is an inch?
One inch equals exactly 2.54 centimetres.
How do I convert kg to pounds?
Multiply kilograms by 2.2046, or use the weight option above.
Can I convert Celsius to Fahrenheit?
Yes, choose the temperature category and pick C and F.