Length Converter

Convert length in both directions with clearly named units.

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From one unit to anotherInstant conversion

From value

From unit

To value

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Conversion

1 Metres (m)
= 0.001 Kilometres (km)

Edit either value to convert in the other direction.

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How Length Converter works

International inch = 0.0254 m; international foot = 0.3048 m.

Try an example

1 mile = 1.609344 kilometres.

Good to know

Values use double-precision arithmetic and are rounded to 13 significant digits. Named definitions matter; choose the intended unit.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use the length converter when a measurement needs to move between metric, imperial or smaller engineering units with the unit names kept visible.

How to use it

Enter a value and choose the source unit.
Choose the destination unit and read the reciprocal conversion by changing either side.
Copy the result together with its unit and sensible displayed precision.

Checks before you rely on the result

Definitions such as inch, foot and metre are fixed conversion factors; a real-world measurement still has its own uncertainty.
Displayed rounding is not extra accuracy.
For engineering, construction or safety work, confirm the governing standard and significant figures.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Length Converter instructions

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