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Length Converter
Convert between 12 units of length — metric and imperial — instantly.
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How to Use This Converter
Type a value in either box and pick the units. The other box updates instantly. Use the swap button to reverse the direction.
- All 12 units are supported in both directions.
- Results update live as you type — no button to press.
- Values are formatted for readability while staying precise.
Frequently Asked Questions
How do I convert miles to kilometers?
Multiply miles by 1.609344. One mile is exactly 1,609.344 meters.
Is a nautical mile the same as a land mile?
No. A nautical mile is 1,852 meters — used for sea and air navigation. A land mile is 1,609.344 meters.
Why are there so many length units?
Different fields standardized on different units: construction uses feet, science uses meters, navigation uses nautical miles.
How accurate are these conversions?
Every conversion uses exact or official definitions, so results are accurate to the last displayed digit.
Practical Example
Convert 2 miles to kilometers. Because 1 mile = 1,609.344 meters exactly, 2 × 1.609344 = 3.218688 km.
- 3.218688 km × 1,000 = 3,218.688 meters
- 3,218.688 m ÷ 0.3048 = 10,560 feet
- In nautical miles: 3,218.688 ÷ 1,852 = 1.738 nmi
What Your Results Mean
- Meters (m) — the SI base unit of length, used throughout science.
- Feet / Inches — imperial units with exact metric definitions (1 ft = 0.3048 m).
- Nautical mile — 1,852 m, used for sea and air navigation.
- Astronomical unit (AU) — the average Earth–Sun distance, 149,597,870.7 km.
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