KM/H to MPH Converter
Convert kilometres per hour to miles per hour in your browser, with a full reference table and the formula behind it. Free, instant, no sign-up.
How to convert kilometres per hour to miles per hour
miles per hour = kilometres per hour × 0.621371
One kilometres per hour is 0.621371 miles per hour, so any conversion is a single multiplication. To go the other way, divide by 0.621371 instead. The converter above is already set to kilometres per hour and miles per hour, so you can type any value and read the answer straight away.
KM/H to MPH conversion table
Common values, worked out in advance:
| Kilometres per hour (km/h) | Miles per hour (mph) |
|---|---|
| 10 km/h | 6.2137 mph |
| 20 km/h | 12.4274 mph |
| 30 km/h | 18.6411 mph |
| 40 km/h | 24.8548 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 80 km/h | 49.7097 mph |
| 100 km/h | 62.1371 mph |
| 120 km/h | 74.5645 mph |
| 140 km/h | 86.992 mph |
The quick mental version
For a rough answer without a calculator, remember that 1 mph is about 1.6093 km/h. That is usually close enough for shopping, travel and DIY, and the converter above gives you the exact figure when it matters.
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Frequently asked questions
How many miles per hour are in 1 km/h?
One km/h is 0.621371 mph. The table above covers the values people look up most often.
What is the formula to convert kilometres per hour to miles per hour?
miles per hour = kilometres per hour × 0.621371. One kilometres per hour is 0.621371 miles per hour, so any conversion is a single multiplication. To go the other way, divide by 0.621371 instead.
Is this km/h to mph converter accurate?
Yes. It uses the exact internationally defined conversion factors and calculates in your browser, so nothing is rounded until the result is displayed.
Can I convert miles per hour back to kilometres per hour here?
Yes. Use the swap button in the converter to reverse the direction, or pick any other pair of units from the two dropdowns.