Convert mile per hour to kilometre per hour
1 mile per hour = 1.609344 kilometres per hour. Enter any value below for an exact conversion.
1 mph =
1.609344 km/h
kilometres per hour
Need the reverse? Convert kilometre per hour to mile per hour →
Formula
1 mile per hour = 1.609344 kilometres per hour kilometre per hour = miles per hour × 1.609344 mile per hour = kilometres per hour × 0.6213712
mile per hour to kilometre per hour conversion table
About converting miles per hour to kilometres per hour
Miles per hour to kilometres per hour is needed when reading US or UK speeds on metric speedometers and signs. A 60 mph limit is about 97 km/h. Multiply mph by 1.609 to get km/h.
Method & sources
Conversions use exact legal definitions rather than rounded approximations: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg (fixed by the 1959 international yard and pound agreement), 1 mile = 1.609344 km, and 1 US liquid gallon = 3.785411784 litres. Temperatures convert with °F = °C × 9⁄5 + 32 and K = °C + 273.15. Results are rounded only for display.
- NIST Special Publication 811 — Guide for the Use of the SI
- NIST Handbook 44, Appendix C — General Tables of Units of Measurement
Page last updated: October 1, 2026
Frequently asked questions
How many kilometres per hour are in a mile per hour?
One mile per hour equals 1.609344 kilometres per hour. So 10 miles per hour is 16.09344 kilometres per hour. Use the converter above for any value.
What is the formula to convert miles per hour to kilometres per hour?
1 mile per hour = 1.609344 kilometres per hour kilometre per hour = miles per hour × 1.609344 mile per hour = kilometres per hour × 0.6213712
Is the mile per hour-to-kilometre per hour conversion exact?
Yes. The conversion factor between miles per hour and kilometres per hour is defined exactly, so results are precise — only rounded for display.
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