Quick Answer: To convert km/h to mph, multiply by 0.621371 (or divide by 1.609344). For example, 100 km/h = 62.14 mph and 120 km/h = 74.56 mph. Quick mental trick: halve the km/h value and add a tenth of it — 100 → 50 + 10 = 60 mph (close to the exact 62).
km/h to mph Converter
Type a speed in either box; the other updates instantly.
The km/h to mph Formula
Direct Answer: mph = km/h × 0.621371. One mile is exactly 1.609344 km, so dividing by 1.609344 gives the same result.
Example: 80 km/h × 0.621371 = 49.71 mph. Going the other way? Use mph to km/h.
km/h to mph Conversion Chart
| km/h | mph | m/s | Example |
|---|---|---|---|
| 10 km/h | 6.2 | 2.78 | |
| 20 km/h | 12.4 | 5.56 | |
| 25 km/h | 15.5 | 6.94 | EU e-bike assistance limit |
| 30 km/h | 18.6 | 8.33 | |
| 40 km/h | 24.9 | 11.11 | |
| 50 km/h | 31.1 | 13.89 | Typical city limit |
| 60 km/h | 37.3 | 16.67 | |
| 70 km/h | 43.5 | 19.44 | |
| 80 km/h | 49.7 | 22.22 | |
| 90 km/h | 55.9 | 25 | |
| 100 km/h | 62.1 | 27.78 | Common rural road limit |
| 110 km/h | 68.4 | 30.56 | |
| 120 km/h | 74.6 | 33.33 | Common motorway limit |
| 130 km/h | 80.8 | 36.11 | French motorway limit (dry) |
| 140 km/h | 87 | 38.89 | |
| 150 km/h | 93.2 | 41.67 | |
| 160 km/h | 99.4 | 44.44 | |
| 180 km/h | 111.8 | 50 | |
| 200 km/h | 124.3 | 55.56 | |
| 215 km/h | 133.6 | 59.72 | |
| 230 km/h | 142.9 | 63.89 | |
| 250 km/h | 155.3 | 69.44 | |
| 280 km/h | 174 | 77.78 | |
| 300 km/h | 186.4 | 83.33 | High-speed train |
| 320 km/h | 198.8 | 88.89 | TGV / Shinkansen top service speed |
| 350 km/h | 217.5 | 97.22 | |
| 400 km/h | 248.5 | 111.11 |
Where km/h and mph Are Used
Kilometers per hour are used on road signs in almost every country. Miles per hour are used in the United States and the United Kingdom and in a few other countries and territories. Many cars sold in mph countries show both scales on the dial.
Want your live speed instead of a conversion? Open the mph speedometer or the km/h speedometer.
Frequently Asked Questions
How many mph is 100 km/h?
100 km/h is 62.14 mph.
How fast is 120 km/h in mph?
120 km/h is 74.56 mph — a common motorway limit in Europe.
What is 200 km/h in mph?
200 km/h is 124.27 mph.
How fast is 280 km/h in mph?
280 km/h is 173.98 mph.
Is kph the same as km/h?
Yes. kph, kmph, km/hr and km/h all mean kilometers per hour.