📏 Miles per hour to Kilometers per hour Converter
Convert miles per hour (mph) to kilometers per hour (km/h) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 mile per hour (mph) = 1.609344 kilometers per hour (km/h). Formula: km/h = mph × 1.609344.
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Miles per hour to Kilometers per hour Converter inputs
Result
Miles per hour to Kilometers per hour conversion table
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 0.1 mph | 0.1609344 km/h |
| 0.5 mph | 0.804672 km/h |
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
| 1,000 mph | 1,609.344 km/h |
Other speed conversions
How to convert miles per hour to kilometers per hour
Multiply the number of miles per hour by 1.609344 to get kilometers per hour: km/h = mph × 1.609344.
Example: 5 mph = 8.04672 km/h.
The mile per hour (mph) and the kilometer per hour (km/h) are both units of speed. Need the opposite direction? Use the km/h to mph converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many kilometers per hour are in a mile per hour?
1 mile per hour = 1.609344 kilometers per hour.
How do I convert miles per hour to kilometers per hour?
Use the formula km/h = mph × 1.609344. For example, 5 mph = 8.04672 km/h.
How do I convert kilometers per hour back to miles per hour?
1 kilometer per hour = 0.62137119 miles per hour. Use the km/h to mph converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.