CALCULATORS & CONVERTERS
Length Converter — mm, cm, m, km, in, ft, yd, mi
Convert length and distance between millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles instantly in your browser.
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1 Millimeter = 0.001 Meter
Convert a length between the metric and imperial systems — millimetres, centimetres, metres and kilometres on one side, inches, feet, yards and miles on the other. Type a value once and read every equivalent, so you can move between a European spec sheet and a US tape measure without a lookup table.
The conversions use the exact international definitions, so the result is as accurate as the number you type: one inch is precisely 25.4 mm, and those factors are fixed by definition rather than approximated.
Common length equivalents (exact factors)
| Unit | Equals |
|---|---|
| 1 inch | 2.54 cm (25.4 mm) |
| 1 foot | 30.48 cm (12 inches) |
| 1 yard | 0.9144 m (3 feet) |
| 1 mile | 1.609344 km (1,760 yards) |
| 1 metre | ≈ 3.281 feet ≈ 1.094 yards |
| 1 km | ≈ 0.621 miles |
These are definitions, not measured approximations, which is why they never drift.
Frequently asked questions
- How do I convert kilometres to miles?
- Divide by 1.609344 (or multiply by about 0.621). So 5 km is about 3.11 miles and 10 km is about 6.21 miles. The tool does the exact division for you.
- Is a yard the same as a metre?
- Close but not equal: one metre is about 1.094 yards, and one yard is 0.9144 metres. Over a long distance, such as a running track, that small gap adds up.
- Is anything uploaded?
- No. The conversion is arithmetic in your browser, so nothing leaves your device and it works offline once loaded.