Convert length units
cm to inches, feet to metres, km to miles, live.
Files stay on your device. No accounts. Free.
Loading tool...
About this tool
Type a number, pick the two units and read the answer instantly: millimetres, centimetres, metres and kilometres on the metric side, inches, feet, yards and miles on the imperial side, converted in any direction.
The unit rate is shown underneath, so 1 cm = 0.3937 in stays visible while you work, and one click swaps the direction. Everything computes locally in your browser.
How it works
- Type an amount and pick your currencies.
- The result updates live as you type.
- Swap the direction with one click.
Frequently asked questions
How many centimetres are in an inch?
An inch is exactly 2.54 centimetres, so divide centimetres by 2.54 to get inches. The converter does this live for any value you type.
How accurate are the conversions?
Exact. Modern imperial units are defined in terms of the metre (an inch is exactly 0.0254 m), so the factors used here are definitions, not approximations. Only the display is rounded.
Can I convert between two imperial units, like miles to feet?
Yes, any unit converts to any other, metric to metric, imperial to imperial or across systems. Pick the pair and the math is instant.