Free Online Length Converter

1. Pick the unit you have in the From dropdown.
2. Pick the unit you want in the To dropdown.
3. Type a value in either field; the other updates instantly.
4. Tap the swap button to flip the direction in one click.

The metre is the SI base unit of length, defined since 1983 as the distance light travels in 1/299,792,458 of a second. Every other length unit in this tool resolves to the metre through a fixed factor: 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 mile = 1609.344 m, 1 nautical mile = 1852 m exactly.

Travellers reading road signs, machinists converting drawings between imperial and metric, runners comparing 5K times to mile splits and architects sizing rooms from a US listing all reach for the same multi-unit utility. Pick the unit you have on one side, the unit you want on the other, and read off the factor so you can sanity-check the result in your head next time.

Everything runs locally in your browser. The formula is shown alongside the answer so you can verify the maths or memorise the ratio.