The kilometer per hour
The kilometer per hour (km/h) is the standard speed unit on road signs almost everywhere except the United States and the United Kingdom. To convert to meters per second, divide by 3.6 (since 1 km = 1000 m and 1 h = 3600 s).
25 Kilometers per hour to Miles per hour
25 km/h = 15.5343 mph
25 kilometers per hour (km/h) equals 15.5343 miles per hour (mph). The conversion uses the exact factor 0.621371: 25 × 0.621371 = 15.5343.
Formula
Miles per hour = Kilometers per hour × 0.621371Quick
How to convert kilometers per hour to miles per hour
Take your value
Start with your value in kilometers per hour.
Multiply by 0.621371
Multiply the kilometer per hour value by 0.621371. This is the exact conversion factor from kilometers per hour to miles per hour.
Read the result
The product is your value in miles per hour. For example, 5 km/h × 0.621371 = 3.10686 mph.
Conversion formula
The exact factor from kilometers per hour to miles per hour is 0.621371.
Miles per hour = Kilometers per hour × 0.621371
Kilometers per hour to Miles per hour conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 km/h | 0.62137 mph |
| 2 km/h | 1.2427 mph |
| 3 km/h | 1.8641 mph |
| 4 km/h | 2.4855 mph |
| 5 km/h | 3.1069 mph |
| 6 km/h | 3.7282 mph |
| 7 km/h | 4.3496 mph |
| 8 km/h | 4.971 mph |
| 9 km/h | 5.5923 mph |
| 10 km/h | 6.2137 mph |
| 12 km/h | 7.4565 mph |
| 15 km/h | 9.3206 mph |
| 18 km/h | 11.185 mph |
| 20 km/h | 12.427 mph |
| 22 km/h | 13.67 mph |
| 25 km/h | 15.534 mph |
| 28 km/h | 17.398 mph |
| 30 km/h | 18.641 mph |
| 32 km/h | 19.884 mph |
| 35 km/h | 21.748 mph |
| 40 km/h | 24.855 mph |
| 45 km/h | 27.962 mph |
| 50 km/h | 31.069 mph |
| 55 km/h | 34.175 mph |
| 60 km/h | 37.282 mph |
| 65 km/h | 40.389 mph |
| 70 km/h | 43.496 mph |
| 75 km/h | 46.603 mph |
| 80 km/h | 49.71 mph |
| 85 km/h | 52.817 mph |
| 90 km/h | 55.923 mph |
| 95 km/h | 59.03 mph |
| 100 km/h | 62.137 mph |
| 110 km/h | 68.351 mph |
| 120 km/h | 74.565 mph |
| 130 km/h | 80.778 mph |
| 140 km/h | 86.992 mph |
| 150 km/h | 93.206 mph |
| 160 km/h | 99.419 mph |
| 180 km/h | 111.85 mph |
| 200 km/h | 124.27 mph |
| 220 km/h | 136.7 mph |
| 250 km/h | 155.34 mph |
| 280 km/h | 173.98 mph |
| 300 km/h | 186.41 mph |
| 350 km/h | 217.48 mph |
| 400 km/h | 248.55 mph |
| 500 km/h | 310.69 mph |
| 700 km/h | 434.96 mph |
| 1000 km/h | 621.37 mph |
Real-world reference
Urban speed limits are typically 50 km/h. Highway speed limits range from 100 to 130 km/h in most of Europe. In miles per hour, that gives you: 1 km/h = 0.621371 mph, 10 km/h = 6.21371 mph, 100 km/h = 62.1371 mph.
Frequently asked questions
- How many miles per hour are in 1 kilometer per hour?
- 1 kilometer per hour equals 0.621371 miles per hour.
- How do I convert kilometers per hour to miles per hour?
- Multiply the kilometer per hour value by 0.621371. So x km/h × 0.621371 = the equivalent in mph.
- What is 5 kilometers per hour in miles per hour?
- 5 kilometers per hour equals 3.10686 miles per hour.
- What is 10 kilometers per hour in miles per hour?
- 10 kilometers per hour equals 6.21371 miles per hour.
- What is 100 kilometers per hour in miles per hour?
- 100 kilometers per hour equals 62.1371 miles per hour.
- How do I convert back from miles per hour to kilometers per hour?
- Multiply the mile per hour value by 1.60934. For example, 1 mph = 1.60934 km/h.
- Is the kilometer per hour bigger than the mile per hour?
- No. 1 kilometer per hour is smaller than 1 mile per hour. It takes 1.60934 kilometers per hour to equal 1 mile per hour.
- Are these conversion factors exact?
- Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (0.621371) is exact within IEEE 754 double precision.
About the kilometer per hour and the mile per hour
The mile per hour
The mile per hour (mph) is the customary speed unit in the United States and the United Kingdom. The conversion 1 mph = 0.44704 m/s is exact, derived from 1 mile = 1609.344 m. A useful mental shortcut: multiply mph by 1.6 to get a close km/h estimate.