Velocity
mphtokm/h
Convert miles per hour (mph) to kilometres per hour (km/h).
Factor1 mph = 1.609344 km/h
Converter
mph
Accepts numbers or expressions, e.g. 150 + 14.7
Result
km/h
Rendered to 6 significant figures.
Formula
Formula
km/h = mph × 1.609344
Multiply any value in miles per hour by 1.609344 to obtain the value in kilometres per hour.
Worked example
Convert 60 mph to km/h.
- 01Start with 60 mph.
- 02Multiply by the conversion factor: 60 × 1.609344 = 96.5606 km/h.
Result60 mph = 96.5606 km/h
Conversion table
| mph | km/h |
|---|---|
| 1 | 1.6093 |
| 2 | 3.2187 |
| 5 | 8.0467 |
| 10 | 16.093 |
| 20 | 32.187 |
| 50 | 80.467 |
| 100 | 160.93 |
| 200 | 321.87 |
| 500 | 804.67 |
| 1000 | 1609.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mph to km/h?
1 mph equals 1.609344 km/h. To convert, multiply the value in miles per hour by 1.609344.
How do I convert 1 mph to km/h?
1 mph = 1.60934 km/h. For any value, multiply by 1.609344.
How do I convert km/h back to mph?
Divide by the same factor — or equivalently, multiply by 0.6213712. So 1 km/h = 0.621371 mph.
When would I need to convert mile per hour to kilometre per hour?
Velocity conversions are needed for fluid flow analysis (line velocity targets, erosional limits), gas-stream calculations, and equipment specs that mix m/s, ft/s and engineering speed units.
Is the conversion exact?
Yes. Both mph and km/h are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).