Length Converter
Convert mm, cm, m, km, inches, feet, miles.
Enter a value to convert instantly between metric and imperial units of length — millimeters, centimeters, meters, kilometers, inches, feet, yards and miles. Everything runs locally in your browser.
Your input is processed locally in your browser — nothing is uploaded, stored or logged.
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How it works
- 1 Type a value.
- 2 Pick the unit to convert from and to.
- 3 Copy the result, or use Swap to reverse.
Common use cases
- Convert measurements for DIY or sewing.
- Switch between metric and imperial.
- Check distances in miles or kilometers.
- Convert dimensions for shipping.
Frequently asked questions
Is my input sent to a server?
No. Every calculation runs locally in your browser — your input is never uploaded, stored or logged.
Which conversion factors are used?
Exact international definitions, e.g. 1 inch = 2.54 cm and 1 mile = 1609.344 m.
Is it really free?
Yes — free, with no signup and no limits.