Kilometers to miles converter

Kilometer distances are common on road signs and running routes. Convert the total route length before estimating travel time; distance alone does not include traffic, stops or elevation. Race names may be rounded labels, so use the measured distance when precision matters.

One kilometre is about 0.6213711922 miles. The international mile is exactly 1,609.344 m, which is 5,280 feet.

Multiply the number of kilometers by 0.6213711922. For example, 10 km × 0.6213711922 = 6.213712 mi. To go the other way, divide by 0.6213711922.

Multiply by 0.62. That is 0.2% low of the exact factor 0.6213711922, so 10 km comes out as 6.2 mi instead of 6.2137.

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “10 km to mi” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.