Miles per hour to kilometres per hour (mph to km/h)
Convert miles per hour to kilometres per hour (× 1.609344), with a table of common speed limits.
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km/h = mph × 1.609344, the length of a mile in kilometres, because both are "per hour". The UK motorway limit of 70 mph is 112.65 km/h, a US 65 mph limit is 104.6 km/h and a 30 mph urban limit is 48.28 km/h.
Drivers renting a car in the US or UK, reading a speedometer with only an mph scale, or comparing car top speeds between brochures are the typical users. Going the other way, divide km/h by 1.609344: 120 km/h is 74.56 mph.
How to use it
- Type the value in the first box; the converted value appears in the second box as you type.
- Or type in the second box to convert the other way.
- Use the Decimals menu to round, and the quick-reference table for common values.
Frequently asked questions
How many km/h is 1 mph?
Exactly 1.609344 km/h.
How many km/h is 70 mph?
112.65 km/h.
How do I convert mph to km/h in my head?
Multiply by 1.6: 60 mph → 96 km/h (exact 96.56).
What about m/s or knots?
Use the speed converter: 1 mph = 0.44704 m/s and 0.868976 knots.
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