Miles per Hour to Kilometers per Hour Converter
One Miles per Hour equals 1.609343999 Kilometers per Hour (1 mph = 1.609343999 kph). Multiply a Miles per Hour value by 1.609343999 to get the equivalent in Kilometers per Hour. The calculator is above; the formula and worked examples are below.
Formula
kph = mph × 1.609343999
Multiply the Miles per Hour value by 1.609343999 to get the equivalent value in Kilometers per Hour.
Example Conversions
1 Miles per Hour (mph)
1.609343999 Kilometers per Hour (kph)
5 Miles per Hour (mph)
8.046719994 Kilometers per Hour (kph)
10 Miles per Hour (mph)
16.09343999 Kilometers per Hour (kph)
25 Miles per Hour (mph)
40.23359997 Kilometers per Hour (kph)
100 Miles per Hour (mph)
160.9343999 Kilometers per Hour (kph)
Conversion Table
| Miles per Hour (mph) | Kilometers per Hour (kph) |
|---|---|
| 0.1 | 0.1609343999 |
| 0.5 | 0.8046719994 |
| 1 | 1.609343999 |
| 2 | 3.218687997 |
| 5 | 8.046719994 |
| 10 | 16.09343999 |
| 25 | 40.23359997 |
| 50 | 80.46719994 |
| 100 | 160.9343999 |
| 250 | 402.3359997 |
| 500 | 804.6719994 |
| 1000 | 1609.343999 |
How to Convert Manually
Use these steps to convert Miles per Hour values to Kilometers per Hour without the calculator.
- Write down the value in Miles per Hour (mph) that you want to convert.
- Multiply that value by 1.609343999.
- For example, 10 Miles per Hour × 1.609343999 = 16.09343999 Kilometers per Hour.
- Label the result as Kilometers per Hour (kph).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Miles per Hour and one Kilometers per Hour.
About Miles per Hour and Kilometers per Hour
The mile per hour is exactly 1.609344 kilometers per hour, the road speed unit of the US and UK. Tennis serves, baseball pitches, and hurricane winds are also quoted in mph. The kilometer per hour is the road speed unit of most of the world, exactly 1/3.6 of a meter per second. Speed limits, car speedometers, and rail and cycling speeds use it outside the US and UK. One Miles per Hour equals 1.609343999 Kilometers per Hour (1 mph = 1.609343999 kph). Miles per Hour is used in US and UK speed limits and in ball sports speeds (pitches, serves). Kilometers per Hour is used in road speed limits outside the US and UK.
Precision and Rounding:Most speed factors are exact because they derive from exact length and time definitions (1 mph = 1.609344 km/h precisely); Mach is the exception, since the speed of sound varies with temperature and altitude. The figure used here is 343 m/s, the sea-level value at 20 °C. One decimal place covers driving and running; aviation and ballistics carry more.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Miles per Hour equals24.14015998Kilometers per Hour.
15 mph × 1.609343999 = 24.14015998 kph
FAQ
How do I convert Miles per Hour to Kilometers per Hour?
Multiply the Miles per Hour value by 1.609343999 to get the equivalent value in Kilometers per Hour.
What is the formula for Miles per Hour to Kilometers per Hour?
The formula is kph = mph × 1.609343999.
How many Kilometers per Hour are in 1 Miles per Hour?
1 Miles per Hour equals 1.609343999 Kilometers per Hour.
Can I convert Kilometers per Hour back to Miles per Hour?
Yes. 1 Kilometers per Hour equals 0.6213711927 Miles per Hour, and the related converter can reverse the calculation.
What are common names for Miles per Hour and Kilometers per Hour?
Miles per Hour is shown as mph and may also be searched as mi/h, miles/hour. Kilometers per Hour is shown as kph and may also be searched as km/h, kmh, kilometers/hour.
Was this page helpful?
Let us know if this converter met your needs.