How to convert lengths
- Type the value you want to convert.
- Choose the unit you have in From and the unit you want in To.
- Read the result at the top. The table shows the same value in every length unit, and the rows give the exact factor both ways.
The address bar keeps your settings, so you can bookmark or share a conversion.
How it works
Each unit is stored as an exact number of meters. To convert, the tool multiplies by the size of the “from” unit and divides by the size of the “to” unit. That means going from miles to kilometers uses 1,609.344 ÷ 1,000 = 1.609344, with no hidden rounding step.
| Unit | Exact size in meters |
|---|---|
| millimeter | 0.001 |
| centimeter | 0.01 |
| inch | 0.0254 |
| foot | 0.3048 |
| yard | 0.9144 |
| mile | 1,609.344 |
| nautical mile | 1,852 |
Worked example
How far is a 10 km run in miles, feet and yards?
- Miles: 10 × 1,000 ÷ 1,609.344 = 6.2137 mi.
- Feet: 10,000 ÷ 0.3048 = 32,808.4 ft.
- Yards: 10,000 ÷ 0.9144 = 10,936.1 yd.
Choose km as the “from” unit and mi as the “to” unit and the table lists all three at once.
Common length facts
- 12 inches make a foot, 3 feet make a yard and 1,760 yards make a mile.
- A meter is about 3.28 feet or 1.09 yards.
- Screen sizes and tires use inches, and most rulers and maps outside the US use centimeters and kilometers.
- US survey feet differ from international feet by two parts per million, which only matters in land surveying.
Popular pairs
For the most searched conversions, open centimeters to inches or miles to kilometers, each with a table of common values. To convert weights, use the weight converter, and for road speeds, the speed converter.
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