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Length Converter

Convert length between 14 units with the formula, a reverse conversion and a quick-reference table.

To convert length, enter a value and pick the units. The result appears instantly with the exact conversion formula, the reverse conversion, a quick-reference table of common values and every one of the 14 supported units. The inch is defined as exactly 25.4 mm and the mile as exactly 1609.344 m, so metric–imperial length conversions are exact rather than approximate.

Runs in your browser
Units supported
14
Base unit
m
Precision
Adjustable from 1 to 15 significant figures
Shows
Formula, reverse conversion and a common-values table
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How accurate is this length converter?

Conversions use exact SI definitions where one exists and are computed in double-precision floating point. You can raise the displayed precision to 15 significant figures, and the unrounded result is shown separately. The inch is defined as exactly 25.4 mm and the mile as exactly 1609.344 m, so metric–imperial length conversions are exact rather than approximate.

Can I reverse the conversion without retyping?

Yes — the swap toggle reverses the two units in place. The reverse rate is also shown in the detail section, so you can read it either way without changing anything.

Is my data sent anywhere?

No. The conversion is plain JavaScript running in your browser. No value you type is transmitted, logged or stored.

Can I link to a specific conversion?

Yes. The URL updates as you type, so you can bookmark or share a link that reopens with exactly the same conversion.

How to use the length converter

  1. 1Set the value.
  2. 2Choose the from.
  3. 3Choose the to.
  4. 4Turn "Swap direction" on or off as needed.
  5. 5Set the significant figures.
  6. 6The result appears immediately — copy or download it.

Embed this tool

Put the working length converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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