Unit Converter
Convert length, weight, temperature, area, volume and speed units instantly.
Runs in your browserCommon conversions
| m | 1 |
| km | 0.001 |
| cm | 100 |
| mm | 1000 |
| in | 39.3701 |
| ft | 3.28084 |
| yd | 1.09361 |
| mi | 0.000621371 |
| nmi | 0.000539957 |
About this tool
A single converter covering the unit families people search for most: length, weight, temperature, area, volume and speed. Everything is calculated in your browser, so it works offline and no value you type ever leaves your device.
How to use it
- 1Pick a category such as Length, Weight or Temperature.
- 2Choose the unit you are converting from and the unit you want.
- 3Type a value — the result and a full conversion table update as you type.
Frequently asked questions
How accurate are the results?
Every conversion uses the exact international definitions (for example 1 inch = 25.4 mm exactly). Results are shown to six significant digits, which is far more precision than everyday use needs.
Why does temperature behave differently?
Length and weight conversions are simple multiplications, but temperature scales have different zero points. Celsius, Fahrenheit and Kelvin are converted with the correct offset formulas, not a single ratio.
Can I convert a long list of values at once?
Yes. The conversion table under the result shows the most common neighbouring units for the value you entered, so you can read several conversions without changing the settings.