Conversion guide
Miles per hour to kilometers per hour
Convert road, running, or vehicle speed from miles per hour to kilometers per hour. Because both units use the same hour, the exact mile-to-kilometer factor transfers directly to speed.
Formulas in both directions
km/h = mph × 1.609344mph = km/h ÷ 1.609344One international mile is exactly 1.609344 km and the time unit is unchanged, so multiply mph by exactly 1.609344.
Common conversion values
| mile per hour (mph) | kilometer per hour (km/h) |
|---|---|
| 1 mph | 1.609344 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 15 mph | 24.14016 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.56064 km/h |
| 70 mph | 112.65408 km/h |
| 100 mph | 160.9344 km/h |
Worked real-world examples
Example 1
A US road has a 55 mph speed limit. Convert it to km/h for a visiting driver.
55 × 1.609344 = 88.5139255 mph = 88.51392 km/hExample 2
A car is traveling at 70 mph. Convert the speed for a metric dashboard comparison.
70 × 1.609344 = 112.6540870 mph = 112.65408 km/hWhat the units mean
mile per hour (mph)
One mile per hour is the speed that covers one international mile in one hour. It is abbreviated mph.
kilometer per hour (km/h)
One kilometer per hour is the speed that covers one kilometer in one hour. Its standard symbol is km/h, though kph is common in plain text.
Where these units are used
Road signs and speedometers use mph in the United States and United Kingdom. Most other countries display road speeds in km/h; international vehicles often show both scales.
Important distinctions
This conversion assumes the international statute mile. Knots are nautical miles per hour and are different. Also distinguish speed from pace, such as minutes per mile.
Accuracy and rounding
Whole km/h is adequate for reading a road sign. Testing, athletics, or telemetry may need one or more decimals; retain the unrounded value for subsequent calculations.
Frequently asked questions
How fast is 60 mph in km/h?
60 mph is exactly 96.56064 km/h, commonly rounded to 96.6 or 97 km/h.
Can I multiply mph by 1.6?
Yes for a quick estimate. Use 1.609344 when an accurate value is required.
Is kph different from km/h?
They describe the same unit. km/h is the standards-based symbol; kph is an informal text abbreviation.
Are knots the same as mph?
No. A knot is one nautical mile per hour and equals 1.852 km/h.