MPH to km/h
Miles per hour to km/h, both ways, speed limits included.
How it works
- 01Type the speed in miles per hour.
- 02Kilometers per hour appear as you type. Type in the km/h box to convert the other way.
- 03Check the chart for common speed limits, or switch to knots or meters per second.
Questions
›What are some common mph to km/h conversions?
10 mph = 16.0934 km/h, 25 mph = 40.2336 km/h, 40 mph = 64.3738 km/h, 55 mph = 88.5139 km/h, 70 mph = 112.654 km/h and 100 mph = 160.934 km/h.
›How many km/h is 1 mph?
Exactly 1.609344 km/h, because a mile is exactly 1.609344 kilometers.
›How do I convert in my head?
Multiply mph by 1.6, or by 8/5: 50 mph is about 80 km/h. To go from km/h to mph, multiply by 0.6 or by 5/8.
›Which countries use mph?
Road signs in the United States and the United Kingdom use miles per hour, as do a few smaller countries and territories. Most of the rest of the world uses km/h.
›Is my data uploaded anywhere?
No. This tool runs entirely in your browser, and Rounder never sends what you type or drop in to a server, ours or anyone else's. Once the page has loaded, along with any AI model the tool uses, it even works offline.
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