Length Unit Converter
Convert length and distance between 69 units: meters, feet, inches, miles, nautical miles, light-years, parsecs, survey and historical units. Every pair has its own converter, formula and table.
1 m = 3.280839895 ft
Popular conversions
- Centimeter to Inchcm → in
- Inch to Centimeterin → cm
- Meter to Footm → ft
- Foot to Meterft → m
- Kilometer to Milekm → mi
- Mile to Kilometermi → km
- Millimeter to Inchmm → in
- Inch to Millimeterin → mm
- Meter to Yardm → yd
- Yard to Meteryd → m
- Foot to Inchft → in
- Meter to Centimeterm → cm
- Nautical Mile to KilometerNM → km
- Light Year to Kilometerly → km
- Micrometer to Millimeterµm → mm
- Astronomical Unit to Kilometerau → km
All length units
Pick a unit to see its conversions to every other unit.
Metric (SI)
Imperial & US customary
US survey units
Nautical
Atomic & physics
Historical & cloth
Typography
Need other quantities? Convert weight, temperature, volume, area, speed, data, time, pressure and energy with the Unit Converter.
Frequently asked questions
How many length units can I convert?
69 units, from attometers to megaparsecs, including US survey, nautical, astronomical, typographic and historical units. Every combination has its own page with a formula and conversion table.
How accurate are the conversions?
Factors come from exact definitions where they exist: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 nautical mile = 1,852 m, 1 astronomical unit = 149,597,870,700 m. Results are shown to 10 significant digits.
What's the difference between the international and US survey foot?
The international foot is exactly 0.3048 m. The US survey foot is 1200/3937 m, about 2 parts per million longer. It only matters for very long distances, such as land surveys and state plane coordinates.
Why do some results use × 10ⁿ?
Very large or very small numbers, such as meters to light-years, are shown in scientific notation so no precision is lost.