Convert miles per hour to kilometers per hour
Converting miles per hour to kilometers per hour is a common speed task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 mph equals 1.60934 km/h, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert miles per hour to kilometers per hour
To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.60934. For example, 10 mph × 1.60934 = 16.0934 km/h.
km/h = mph × 1.60934
- Write down the value in miles per hour you want to convert.
- Multiply it by 1.60934 (the exact mph→km/h factor).
- The result is your value in kilometers per hour. Check it below with the converter or the table.
Conversion table
Common values of miles per hour and their equivalents in kilometers per hour:
| mph | km/h |
|---|---|
| 1 | 1.60934 |
| 2 | 3.21869 |
| 3 | 4.82803 |
| 4 | 6.43738 |
| 5 | 8.04672 |
| 10 | 16.0934 |
| 20 | 32.1869 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.934 |
| 250 | 402.336 |
| 500 | 804.672 |
About these units
Mile per Hour (mph). Miles per hour is the road speed unit in the United States and the United Kingdom, expressing how many statute miles are covered in one hour. One mph equals exactly 0.44704 m/s.
Kilometer per Hour (km/h). Kilometers per hour is the standard speed unit for road traffic in metric countries, expressing how many kilometers are covered in one hour. Speed limits and car speedometers use km/h.
Frequently asked questions
How do I convert miles per hour to kilometers per hour?
To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.60934. For example, 10 mph × 1.60934 = 16.0934 km/h. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many kilometers per hour are in 1 mile per hour?
1 mph = 1.60934 km/h. That is the fixed relationship used by this converter and by international standards.
How many miles per hour are in 1 kilometer per hour?
1 km/h = 0.621371 mph. If you are converting in the opposite direction, use our Kilometer per Hour to Mile per Hour converter for the dedicated table and FAQ.
Is the miles per hour to kilometers per hour conversion exact?
Yes. Both units are defined by international agreement, so the factor of 1.60934 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is mile per hour used for?
Miles per hour is the road speed unit in the United States and the United Kingdom, expressing how many statute miles are covered in one hour. One mph equals exactly 0.44704 m/s.