MPH to km/h Converter
Convert mph to km/h instantly — 60 mph = 96.56 km/h (1 mile = 1.609344 km exactly). US speed limits to metric, both directions.
About the MPH to km/h Converter
This free MPH to km/h converter multiplies by the exact factor 1.609344. Enter miles per hour to get kilometers per hour, or type km/h to convert back — both directions update live.
It is the go-to conversion for reading American and British speeds in metric: a 65 mph interstate limit is 104.6 km/h, the 70 mph UK motorway limit is 112.7 km/h, and a 25 mph school zone is 40.2 km/h. It also converts hurricane wind speeds, baseball pitch speeds (95 mph = 152.9 km/h) and treadmill or cycling stats from US fitness apps.
The table covers the standard US limits — 25, 55, 65, 70, 80 mph — alongside their metric equivalents.
How to Use the MPH to km/h Converter
- 1Enter a speed in mph — km/h appears instantly.
- 2Or type km/h to convert back to mph.
- 3Copy the result, or scan the table of US speed limits in metric.
Frequently Asked Questions
How many km/h is 60 mph?
60 mph equals 96.56 km/h — just under the 100 km/h highway limits used in metric countries. That's why 0–60 mph and 0–100 km/h times are close but not identical.
What is 70 mph in km/h?
70 mph is 112.65 km/h — the UK motorway limit and a common US interstate limit. Also useful: 55 mph = 88.5 km/h, 65 mph = 104.6 km/h and 80 mph = 128.7 km/h.
How do I convert mph to km/h quickly in my head?
Multiply by 1.6: 30 mph ≈ 48 km/h, 50 mph ≈ 80 km/h, 100 mph ≈ 160 km/h (exact: 160.9). Adding 60% to the mph number gets you within half a percent of the true value.
How fast is 100 mph in km/h?
100 mph equals 160.93 km/h. Sports references: a 95 mph fastball is 152.9 km/h, and a 150 mph tennis serve is 241.4 km/h.
Why is the factor exactly 1.609344?
The 1959 international yard and pound agreement fixed the yard at 0.9144 m, making the mile (1,760 yards) exactly 1,609.344 m. So mph × 1.609344 = km/h with zero rounding error in the definition.