Length & Distance Converter
Enter a length or distance in any common unit and see it in all the others instantly: micrometre (µm), millimetre (mm), centimetre (cm), metre (m), kilometre (km), inch (in), foot (ft), yard (yd), statute mile (mi) and nautical mile (nmi). The value is converted to metres internally and then to every unit, so conversions are exact. The imperial units derive from the exact definition 1 inch = 0.0254 m. Handy for everyday measuring (cm ↔ inch), distance and travel (km ↔ mile), construction (m, ft, yd), navigation (nautical mile) and science (µm, mm). Everything is computed locally in your browser.
µm
1,000,000
mm
1,000
cm
100
m (metre)
1
km
0.001
in (inch)
39.370079
ft (foot)
3.2808399
yd (yard)
1.0936133
mi (mile)
0.00062137
nmi (naut.)
0.00053996
How to use
- Type a length or distance value.
- Pick the unit you entered it in.
- Read the value in every other unit and copy whichever you need.
Frequently asked questions
- How many centimetres is one inch?
- 1 inch = 2.54 cm exactly (25.4 mm), because the inch is defined as 0.0254 m. So 1 cm ≈ 0.3937 inch, and a 12-inch (1 ft) ruler is 30.48 cm.
- How many kilometres is a mile?
- 1 statute mile = 1.609344 km exactly, so 1 km ≈ 0.621371 mile. A 5K run is about 3.11 miles, and 100 km/h ≈ 62.14 mph.
- What is a nautical mile and why is it different?
- A nautical mile (nmi) = 1852 m exactly, a bit longer than a statute mile (1609.344 m). It's based on one minute of latitude and is used in aviation and shipping; speed in nautical miles per hour is a knot.
- Are the foot, yard and mile the same everywhere?
- The international foot (0.3048 m), yard (0.9144 m) and mile (1609.344 m) used here are standard worldwide. The tiny historical US survey foot (retired in 2023) differed by about 2 parts per million and only matters for legacy geodetic data.
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