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Miles to kilometers (mi to km)

To convert miles to kilometers (mi to km): one mile is 1.609344 kilometers, so 10 mi is 16.0934 km.

Swap units: km to mi

In kilometers16.0934 km

Conversion factor Exact by definition. The inch has been exactly 2.54 cm and the pound exactly 0.45359237 kg since the 1959 international yard and pound agreement, so these are not measurements that can drift.
1 mile = 1.609344 kilometers
The other way
1 kilometer = 0.6213711922 miles
Working
10 x 1.609344 = 16.0934
10 mi in every unit
16,093,440 mm 1,609,344 cm 16,093 m 16.093 km 633,600 in 52,800 ft 17,600 yd 10 mi 8.6898 nmi
miles to kilometers
mikm
11.60934
23.21869
58.04672
1016.0934
2540.2336
5080.4672
100160.934

How the Unit Converter works

One mile is 1.609344 kilometers. Both units are defined against the same SI base unit, so the factor is derived from two exact definitions rather than measured. It is exact in principle and does not land on a round number.

Worked through: 10 mi x 1.609344 = 16.0934 km.

Going the other way, one kilometer is 0.6213711922 miles.

For mental arithmetic: Multiply by 8 and divide by 5. 15 miles is 120/5 = 24 km.

Running and driving, mostly. The landmarks worth knowing: a 5K is 3.1 miles, a 10K is 6.2, a half marathon is 13.1 and a marathon is 26.2. Those four cover most of why anyone converts in this direction.

Precision is worth matching to the input. A measurement given as 1 mi carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.

Unit Converter FAQ

How many kilometers are in a mile?

1.609344. The factor is derived from the definitions of both units against the same SI base, so it is exact in principle but not a round number.

What is 10 mi in kilometers?

16.0934 km. Multiply by 1.609344: 10 mi x 1.609344 = 16.0934 km.

How do I convert kilometers back to miles?

Divide by 1.609344, or equivalently multiply by 0.62137119. One kilometer is 0.62137119 miles. The two factors are reciprocals, so you only need to remember one of them.

Is there a quick way to do this in my head?

Multiply by 8 and divide by 5. 15 miles is 120/5 = 24 km. It is close enough for everyday use.

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