Length Converter
Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.
Your figures
Result
How to use this tool
- Enter your own figures over the defaults — Value, From.
- The answer updates as you type. There is no button, and nothing is sent anywhere.
- Change one input at a time to see how sensitive the answer is to it.
An inch is defined as exactly 25.4 mm, so metric and imperial conversions are exact rather than approximate.
How it works
This takes 2 inputs — value, from — and returns metres, centimetres, inches, feet, kilometres and miles. The whole calculation happens in this page as you type: there is no submit button, no request, and nothing stored.
A worked example
Worked through with the figures the page already has in it: value of 100 and from of cm, giving metres of 1.0000. These numbers come from running the calculator’s own code, not from being typed in here, so they cannot drift away from what you see on screen.
Starting from:
- Value: 100
- From: cm
| Result | Value |
|---|---|
| Metres | 1.0000 |
| Centimetres | 100.00 |
| Inches | 39.370 |
| Feet | 3.281 |
| Kilometres | 0.00100 |
| Miles | 0.00062 |
Length Converter — frequently asked questions
How many cm in an inch?
Exactly 2.54 — the inch has been defined as precisely 25.4 mm since 1959.
How many feet in a metre?
About 3.28084 feet, or one foot equals exactly 0.3048 metres.
What about nautical miles?
A nautical mile is 1,852 metres, distinct from the statute mile of 1,609.344 metres.
Is this calculator free?
Yes, with no account, no limits and no data collection. It runs entirely in your browser.
Should I rely on this for a financial or medical decision?
No. It is a planning estimate built on standard formulas and stated assumptions. For decisions that matter, speak to a qualified professional who can account for your full circumstances.
Is this calculator accurate?
The arithmetic is exact — it uses the standard formula. What limits accuracy is the assumptions: the figures you enter, and factors the formula does not model such as fees, taxes and rule changes.
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Nothing is sent anywhere. The figures you type stay in this page and are never transmitted or stored — how that works.
Disclaimer. The formula is exact; the answer is only as good as the figures and assumptions above. Not financial, tax, medical or legal advice. Full disclaimer.