Convert MPH to KMH, Free
Type any MPH value and see the KMH result instantly. No button press needed.
How to convert MPH to KMH
Miles per hour (mph) is the speed unit used in the United States and United Kingdom, while kilometers per hour (km/h) is the standard in most of the rest of the world. The conversion factor is exactly 1.60934: one mile per hour equals approximately 1.609 kilometers per hour.
Enter a speed in mph and the converter multiplies by 1.60934 to give the km/h equivalent. This is useful for reading foreign speed limit signs, comparing car performance specs, or converting running pace between imperial and metric units.
Enter the speed in mph
Type the speed value in miles per hour into the input field.
Read the km/h result
The equivalent in kilometers per hour appears instantly.
Copy the result
Use the copy button to paste the value into your document or calculation.
Frequently asked questions
How many km/h is 60 mph?
60 mph is approximately 96.6 km/h. A quick mental approximation is to multiply mph by 1.6.
How many km/h is 100 mph?
100 mph equals approximately 160.9 km/h.
What is the speed of light in km/h?
The speed of light is approximately 670,616,629 mph, which equals about 1,079,252,849 km/h (roughly 1.08 billion km/h).
What is the conversion formula?
Multiply mph by 1.60934 to get km/h. To go the other way, divide km/h by 1.60934 (or multiply by 0.62137).
How many km/h is 30 mph?
30 mph equals approximately 48.3 km/h. A UK residential speed limit of 30 mph corresponds to about 48 km/h.