Metric and imperial, side by side
Length is the unit people convert most: a height in feet and inches into centimetres, a run in miles into kilometres, or a measurement on a plan from millimetres to inches. This converter covers the full range — millimetre, centimetre, metre, kilometre, inch, foot, yard and mile — and switches between them instantly.
How it works
Every unit is converted through a common base (the metre), which keeps the maths exact and consistent. Pick the unit you have, the unit you want, type a value, and the result updates. It's handy for travel, DIY, sewing, sport and schoolwork alike.
Common conversions
- 1 inch = 2.54 cm
- 1 foot = 30.48 cm
- 1 mile ≈ 1.609 km
- 1 metre ≈ 3.281 feet
Frequently asked questions
Which units are supported?
mm, cm, m, km, inch, foot, yard and mile.
How precise is it?
It converts using exact factors and shows several decimals.
Is my data private?
Yes — everything is calculated in your browser.