Formula
mph to km/h conversion formula
Use this relationship for a direct conversion:
km/h = mph x 1.609344
Worked example
2 mph = 3.218688 km/h.
All listed factors are fixed by exact length and time definitions.
Speed conversion
Convert Mile per hour to Kilometer per hour
1 mile per hour (mph) equals 1.609344 kilometer per hour (km/h). Enter any value below to convert from mph to km/h.
Enter a value and choose units. Results update instantly.
1 mph = 1.609344 km/h
All Speed units
From 1 mph| Unit | Value |
|---|---|
| Meter per second m/s | 0.44704 |
| Kilometer per hour km/h | 1.609344 |
| Mile per hour mph | 1 |
| Knot kn | 0.8689762419 |
| Foot per second ft/s | 1.4666666667 |
| Centimeter per second cm/s | 44.704 |
| Speed of light c | 0.0000000015 |
Recent conversions
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Quick reference
Mile per hour to Kilometer per hour table
| Mile per hour (mph) | Kilometer per hour (km/h) |
|---|---|
| 0.01 | 0.01609344 |
| 0.1 | 0.1609344 |
| 1 | 1.609344 |
| 2 | 3.218688 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 1,000 | 1,609.344 |
From unit
About the mile per hour
One international mile traveled in one hour.
Symbol: mph
To unit
About the kilometer per hour
One kilometer traveled in one hour.
Symbol: km/h
Keep converting
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Conversion standard
Definitions are checked against BIPM SI Brochure and international unit definitions. Calculations use full internal precision before display rounding.
View the complete speed converterQuestions
mph to km/h FAQ
How do you convert mile per hour to kilometer per hour?
Use the formula km/h = mph x 1.609344. 1 mile per hour (mph) equals 1.609344 kilometer per hour (km/h).
Is the mph to km/h conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.