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Free Length Converter – Convert Meters, Feet & More

Convert between metric and imperial units of length and distance.

Length Converter What is this? ↓
About the Length Converter

What is the Length Converter?

A length converter translates any distance between metric units such as millimetres and kilometres and imperial units such as inches, feet and miles.

Why use this calculator?

Shopping abroad, following a foreign blueprint or reading a vintage manual all require quick, accurate length conversion.

How to use it

  1. Enter the length value.
  2. Pick the source and target units.
  3. Read the converted length.

Formula

Every unit is defined relative to the meter, the SI base unit of length.
The inch is defined as exactly 25.4 mm, so all imperial length units follow from it.
Frequently Asked Questions
How many feet are in a meter?
One meter equals about 3.28084 feet.
What is a nautical mile?
It is 1,852 meters, historically one minute of latitude, and is still used in aviation and marine navigation.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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