How to convert miles per hour to kilometers per hour
Miles per Hour and Kilometers per Hour both measure speed, so converting is a single multiplication. One mph equals 1.609343 km/h, so you multiply your miles per hour value by 1.609343.
Formula: kilometers per hour = miles per hour × 1.609343. For example, 10 mph = 16.093427 km/h.
Miles per Hour to Kilometers per Hour conversion table
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 1 | 1.609343 |
| 2 | 3.218685 |
| 5 | 8.046714 |
| 10 | 16.093427 |
| 25 | 40.233568 |
| 50 | 80.467136 |
| 100 | 160.934271 |
| 1,000 | 1,609.342713 |
Miles per Hour and Kilometers per Hour explained
Miles per Hour (mph): The imperial speed unit for vehicles in the US and UK.
Kilometers per Hour (km/h): The metric speed unit for vehicles in most of the world.
When you'd convert miles per hour to kilometers per hour
You'll convert miles per hour to kilometers per hour whenever a measurement is given in one unit but you need it in the other — comparing miles per hour and kilometers per hour figures across regions, following a recipe or spec, or double-checking a number. Because 1 mph is exactly 1.609343 km/h, the result is precise every time.
Frequently asked questions
How many kilometers per hour are in a miles per hour?
One mph equals 1.609343 km/h. Multiply your miles per hour figure by 1.609343 to get kilometers per hour.
What is the formula to convert miles per hour to kilometers per hour?
kilometers per hour = miles per hour × 1.609343. The factor 1.609343 is exact.
What is 2 miles per hour in kilometers per hour?
2 mph = 3.218685 km/h. You can enter any value in the converter above to get an instant result.
Is this Miles per Hour to Kilometers per Hour converter accurate?
Yes. It uses the standard conversion factor (1 mph = 1.609343 km/h) defined by BIPM — SI Brochure (derived units), so results are exact to several decimal places.