Miles per hour to Kilometres per hour
Type a value in Miles per hour and get the result in Kilometres per hour, calculated exactly.
100 Miles per hour = 160.9344 Kilometres per hour
Precision
Exact factorThis result is exact.
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Formula
km/h = mph × 1.609344
To convert Miles per hour to Kilometres per hour, multiply the value by 1.609344.
Worked examples
- 1 mph × 1.609344 = 1.609344 km/h
- 100 mph × 1.609344 = 160.9344 km/h
- 50 mph × 1.609344 = 80.4672 km/h
This factor is exact by definition.
Conversion table
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 1 | 1.609344 |
| 2 | 3.218688 |
| 3 | 4.828032 |
| 4 | 6.437376 |
| 5 | 8.04672 |
| 6 | 9.656064 |
| 7 | 11.265408 |
| 8 | 12.874752 |
| 9 | 14.484096 |
| 10 | 16.09344 |
| 15 | 24.14016 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
| 75 | 120.7008 |
| 80 | 128.74752 |
| 90 | 144.84096 |
| 100 | 160.9344 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Kilometres per hour to Miles per hour
| Kilometres per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 | ≈ 0.6213712 |
| 2 | ≈ 1.242742 |
| 3 | ≈ 1.864114 |
| 4 | ≈ 2.485485 |
| 5 | ≈ 3.106856 |
| 6 | ≈ 3.728227 |
| 7 | ≈ 4.349598 |
| 8 | ≈ 4.97097 |
| 9 | ≈ 5.592341 |
| 10 | ≈ 6.213712 |
| 15 | ≈ 9.320568 |
| 20 | ≈ 12.42742 |
| 25 | ≈ 15.53428 |
| 30 | ≈ 18.64114 |
| 40 | ≈ 24.85485 |
| 50 | ≈ 31.06856 |
| 60 | ≈ 37.28227 |
| 70 | ≈ 43.49598 |
| 75 | ≈ 46.60284 |
| 80 | ≈ 49.7097 |
| 90 | ≈ 55.92341 |
| 100 | ≈ 62.13712 |
Unit definitions
- Miles per hour mph
- One mile per hour: exactly 0.44704 metres per second.
- Kilometres per hour km/h
- 1000 metres in 3600 seconds: exactly 5/18 of a metre per second.
Questions people ask
Miles per hour to Kilometres per hour: what is the conversion factor?
One mph is 1.609344 km/h.
How do I convert Miles per hour to Kilometres per hour?
Use the formula above. For example, 100 mph = 160.9344 km/h.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.