Length Converter
Converts any length or distance between metric and imperial units. Every factor here is exact by definition — an inch has been exactly 25.4 mm since the 1959 international yard and pound agreement, so these are not approximations.
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The formula
result = value × (from factor ÷ to factor)
Each length unit is defined by its size relative to the metre, so converting between any two is a single multiplication.
Every length unit
| Unit | Symbol | In one metre |
|---|---|---|
| millimetre | mm | 1,000 |
| centimetre | cm | 100 |
| metre | m | 1 |
| kilometre | km | 0.001 |
| inch | in | 39.370079 |
| foot | ft | 3.2808399 |
| yard | yd | 1.0936133 |
| mile | mi | 0.00062137119 |
| nautical mile | nmi | 0.0005399568 |
Frequently Asked Questions
How many feet are in a metre?
One metre is 3.28084 feet. Going the other way, one foot is exactly 0.3048 metres.
Why is a nautical mile different from a mile?
A nautical mile is 1,852 metres — originally one minute of latitude along a meridian, which is why it is used for sea and air navigation. A statute mile is 1,609.344 metres.
Are these conversions exact?
Yes, for the imperial units. Inch, foot, yard and mile are all defined in terms of the metre by international agreement, so the factors are exact rather than measured.