Converters
Convert length between metres, kilometres, centimetres, millimetres, inches, feet, and miles — type a value and see all seven units at once.
Results update as you type. No calculate button. All calculations run locally in your browser.
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| Unit | Value |
|---|
All seven units describe the same length; the inch and foot factors below are exact definitions.
Target value = input × source-unit factor ÷ target-unit factor, where factors are metres per unit.
| Unit | Metres per unit |
|---|---|
| Metre (m) | 1 |
| Kilometre (km) | 1,000 |
| Centimetre (cm) | 0.01 |
| Millimetre (mm) | 0.001 |
| Inch (in) | 0.0254 |
| Foot (ft) | 0.3048 |
| Mile (mi) | 1,609.344 |
The inch is defined as exactly 0.0254 m, so the foot (12 inches) and the international mile (5,280 feet) are exact too.
1 m ÷ 0.3048 m/ft = 3.280840 ft, and 1 m ÷ 0.0254 m/in = 39.370079 in. A 5 km run is 5,000 ÷ 1,609.344 = 3.106856 miles.
Negative lengths are rejected as invalid. Display values are rounded to 6 decimal places; the underlying calculation is not rounded. This page uses the international mile; the old US survey mile (about 2 parts per million longer) is not used.
3.28083989501 ft, shown as 3.280840 after display rounding.
Yes: since 1959 the international inch is defined as exactly 25.4 mm.
Not listed separately: 1 yard = 3 feet = 0.9144 m. Enter feet and divide by 3, or enter metres and use the foot result.
Because 1 m is a tiny fraction of a mile (0.000621 mi); 6 decimal places keep it visible instead of rounding to zero.
No — length only. Area and volume have their own converters in the related tools below.
Results are estimates only and do not constitute professional advice.