Length Converter

Convert any length between metric and imperial units — type a value, pick the unit, and all conversions appear instantly.

What Does This Tool Do?

Convert any length value between 10 common units including millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles — all shown simultaneously. Click any result to copy it.

Key Features

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10 Units
mm, cm, m, km, in, ft, yd, mi, nmi, μm.
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Live
All units update instantly as you type.
🌍
Metric & Imperial
Both systems covered in one tool.
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Click to Copy
Click any result card to copy the value.

How to Use

  1. Enter the length value.
  2. Select the unit you are converting from.
  3. All other units appear instantly — click any to copy.

Frequently Asked Questions

How many cm in an inch?▾
Exactly 2.54 cm per inch. This is a defined conversion (not approximate).
How many metres in a mile?▾
1 mile = 1609.344 metres exactly.
What is a nautical mile?▾
1 nautical mile = 1852 metres. Used in maritime and aviation navigation, defined as one minute of latitude.