Value, From, To
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How this calculator works
Since the 1959 international yard and pound agreement, the inch is defined as exactly 25.4 mm, so conversions between metric and US customary or imperial lengths are exact. The calculator converts your value to meters and then to every other unit.
Formula
- 1 in = 2.54 cm (exact)
- 1 ft = 12 in = 0.3048 m
- 1 yd = 3 ft = 0.9144 m
- 1 mi = 5,280 ft = 1.609344 km
- 1 nautical mile = 1,852 m
Worked example
1 mi to km
- Value
- 1
- From
- Mile (mi)
- To
- Kilometer (km)
Result1.609344 km
1 mi = 1.609344 km. 1 mi = 1.609344 km.
Frequently asked questions
How many centimeters are in an inch?
Exactly 2.54 cm. That definition has been fixed internationally since 1959.
How many kilometers are in a mile?
1 mile is exactly 1.609344 km, and 1 km is about 0.621371 miles.
What is a nautical mile?
A unit used at sea and in aviation, defined as exactly 1,852 meters. It is about 1.15 statute miles.
Sources
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Results are estimates based on the values you enter and the published method shown above. They do not replace professional medical, financial or legal advice. Method reviewed October 7, 2026. About this site