Kilometers per Hour to Miles per Hour (km/h to mph)
Divide kilometers per hour by 1.609344 to get miles per hour. 100 km/h is 62.1 mph and 50 km/h, a common urban limit, is 31.1 mph. The converter updates as you type in either box.
Convert km/h to mph
Result
km/h to mph
100 km/h = 62.1371 mph
1 km/h = 0.621371 mph · 1 mph = 1.60934 km/h
Show the mathHow it was calculated
mph = km/h ÷ 1.609344
Uses exact legal definitions; results are rounded to 6 significant figures for display.
How to convert km/h to mph
mph = km/h ÷ 1.609344
One mile per hour is exactly 1.609344 kilometers per hour, so divide by 1.609344. If you'd rather multiply, use 0.621371 (rounded).
Worked example: converting 100 km/h:
- mph = km/h ÷ 1.609344
- 100 km/h ÷ 1.609344 = 62.1371 mph
Km/h to mph conversion table
Common values, each computed with the exact formula and rounded to 6 significant figures.
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 5 km/h | 3.10686 mph |
| 10 km/h | 6.21371 mph |
| 15 km/h | 9.32057 mph |
| 20 km/h | 12.4274 mph |
| 25 km/h | 15.5343 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 |
| 70 km/h | 43.496 mph |
| 80 km/h | 49.7097 mph |
| 90 km/h | 55.9234 mph |
| 100 km/h | 62.1371 mph |
| 110 km/h | 68.3508 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7783 mph |
| 140 km/h | 86.992 mph |
| 150 km/h | 93.2057 mph |
| 160 km/h | 99.4194 mph |
| 180 km/h | 111.847 mph |
| 200 km/h | 124.274 mph |
| 250 km/h | 155.343 mph |
| 300 km/h | 186.411 mph |
| 320 km/h | 198.839 mph |
Quick reference: everyday kilometers per hour in miles per hour
Typical town-center limit
30 km/h = 18.6411 mph
Common European urban limit
50 km/h = 31.0686 mph
Common highway limit in Canada
100 km/h = 62.1371 mph
French motorway limit (dry)
130 km/h = 80.7783 mph
High-speed train service speed
300 km/h = 186.411 mph
Driving abroad: km/h limits in mph
Rental cars in metric countries show km/h first, and some have no mph scale at all. A few values are worth memorizing. 30 km/h is 18.6 mph, typical in town centers and school zones. 50 km/h (31.1 mph) is the usual urban limit in much of Europe. 90 km/h (55.9 mph) is common on rural roads. 130 km/h (80.8 mph) is the motorway limit in France in dry weather.
Speed cameras in metric countries enforce the posted km/h figure, often with only a small tolerance. Rounding 50 km/h to '30 mph' feels close, but 31 mph in a 50 zone is right at the limit. Keep the speedometer's km/h scale in view rather than converting on the move.
High-speed trains, wind and sports
High-speed rail figures are almost always given in km/h. Lines running at 300 km/h are carrying passengers at 186 mph, and 320 km/h is 199 mph. Tennis serve speeds and football shot speeds on international broadcasts may also be shown in km/h. A 200 km/h serve is 124 mph.
Wind forecasts outside the US use km/h or m/s. A 50 km/h gust is 31 mph, strong enough to make an umbrella hard to hold. To get m/s from km/h, divide by 3.6, so 50 km/h is 13.9 m/s.
Frequently asked questions
What's a quick way to convert km/h to mph in my head?
Multiply by 6 and drop the last digit, which is the same as multiplying by 0.6. For 100 km/h that gives 60 mph, against an exact 62.1 mph. The shortcut reads about 3.4% low. Multiplying by 0.62 is within 0.3%, so add a couple of mph at highway speeds.
How do I convert km/h to meters per second?
Divide by 3.6. An hour has 3,600 seconds and a kilometer has 1,000 meters, so 1 km/h = 1,000 ÷ 3,600 m/s. 36 km/h is exactly 10 m/s and 100 km/h is 27.8 m/s. To go from m/s back to km/h, multiply by 3.6.
How do I convert a running pace in min/km to mph?
First turn the pace into km/h by dividing 60 by the minutes per kilometer, then divide by 1.609344. A 5:00/km pace is 12 km/h, which is 7.46 mph. A 6:00/km pace is 10 km/h, or 6.21 mph. Treadmills in the US use the mph figure.