Calculators & everyday math
Mph vs. Km/h: Converting Road Speeds
Road speeds are given in miles per hour in the US and UK and in kilometers per hour almost everywhere else. The conversion uses the same exact factor as miles and kilometers, and a quick rule of thumb covers everyday driving.
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The exact factor
1 mph is exactly 1.609344 km/h, and 1 km/h is about 0.6213711922 mph. 60 mph is therefore exactly 96.56064 km/h.
Kilometers per hour to mph
| km/h | mph |
|---|---|
| 30 | 18.64113577 |
| 50 | 31.06855961 |
| 80 | 49.70969538 |
| 100 | 62.13711922 |
| 120 | 74.56454307 |
Mph to kilometers per hour
| mph | km/h |
|---|---|
| 20 | 32.18688 |
| 30 | 48.28032 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
Quick rules
- mph to km/h: multiply by 1.6.
- km/h to mph: multiply by 5/8 (or 0.6).
Mph vs. Km/h FAQ
- What is 100 km/h in mph?
- About 62.1 mph (62.13711922).
- What is 70 mph in km/h?
- Exactly 112.65408 km/h.
- Is km/h the same as kph?
- Yes. “kph” is an informal abbreviation; km/h is the standard symbol.
- How do I convert quickly while driving?
- Multiply mph by 1.6 for km/h, or multiply km/h by 0.6 for mph.
- Is the factor the same as miles to kilometers?
- Yes, because both speeds are per hour: only the distance unit changes.
Related guides
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