Miles per Hour to Kilometers per Hour (mph to km/h)
1 mile per hour equals 1.609344 kilometers per hour — multiply the number of miles per hour by 1.609344 to convert to km/h. Because one mile is defined as exactly 1.609344 kilometers, the same factor applies to speed. The conversion is exact.
The formula
To convert miles per hour to kilometers per hour, multiply by the exact factor:
km/h = mph × 1.609344
For example, 60 mph × 1.609344 = 96.56 km/h. To reverse it, multiply km/h by 0.621371 to get mph.
Conversion table
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 1 | 1.609344 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
| 100 | 160.9344 |
How to convert online
- Type the number of miles per hour into the first box.
- Read the km/h value instantly in the second box.
- Or enter a km/h value to convert back to mph — it works both ways.
Use the Mile per Hour to Kilometer per Hour Converter — free and instant in your browser.
Where this conversion is used
This is one of the most-searched speed conversions, essential for driving abroad, reading car speedometers, comparing race and running paces, and interpreting weather and wind speeds between the US/UK (mph) and the rest of the world (km/h).
Worked example
Suppose a US speed limit sign reads 65 mph and you are driving a car with a km/h speedometer. Apply the formula: 65 × 1.609344 = 104.6 km/h, so you should sit at about 105 km/h. A brisk 30 mph residential limit is 30 × 1.609344 = 48.28 km/h. Reversing it, a 130 km/h motorway limit is 130 × 0.621371 = 80.78 mph. Because a mile is defined as exactly 1.609344 km, these conversions are precise, which matters when a few km/h can be the difference between legal and speeding.
FAQ
How many km/h are in a mph?
One mile per hour equals 1.609344 km/h. Multiply mph by 1.609344 — for example, 10 mph = 16.09344 km/h.
What is 60 mph in km/h?
60 mph = 96.56064 km/h, roughly 97 km/h.
How do I convert km/h back to mph?
Multiply km/h by 0.621371 (or divide by 1.609344). So 100 km/h = 62.14 mph.
What is 70 mph in km/h?
70 mph equals 112.65408 km/h, roughly 113 km/h — useful when a 70 mph motorway limit meets a metric speedometer. A 50 mph limit is 80.4672 km/h.
Related converters
- Kilometer per Hour to Mile per Hour Converter
- Mile per Hour to Meter per Second Converter
- Mile per Hour to Knot Converter
- Mile per Hour to Foot per Second Converter
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