A US speed limit
A 65 mph limit is about 105 km/h.
Use mph to km/h
Converts miles per hour to kilometres per hour in this tab, with nothing sent anywhere.
Runs entirely on your deviceThe conversion happens in this browser tab. Nothing you type is uploaded, logged or stored, which is worth knowing for anything you would not paste into a search box.
A 65 mph road sign converts to 104.61 km/h, usually rounded to 105 for a quick comparison. Do not substitute that rounded number for the posted limit when setting cruise control or judging enforcement tolerance.
Explore general converters
Find related browser-local tools for nearby tasks without starting another search.
Browse all general convertersAbout mph to km/h
Miles per hour reads on US and UK speedometers and road signs, but most of the world, and all of motorsport's data, uses kilometres per hour. Converting mph to km/h turns an imperial speed into the metric figure the majority of drivers see. One mph is 1.6093 km/h, so a 70 mph motorway limit is about 113 km/h. Driving abroad flips the problem: a US licence-holder used to mph reads the km/h figure to match the speed the local signs and the rental car's dashboard both use. Wind speeds in a US forecast come in mph, and converting to km/h lets a sailor or pilot abroad match them to the metric limits their charts use. Converting a posted speed limit changes its unit, not the legal limit or the accuracy of a speedometer. For example, 60 mph is 96.56064 kph, not exactly 100 kph. The common mental shortcut is useful for estimates but not for comparing precise limits.
Using mph to km/h
- Type a number of mph. You can paste a value with its unit; the tool reads the number.
- The exact factor is applied and the result is shown as km/h, updating live as you type.
- Copy the answer, or switch to the reverse converter to go from km/h back to mph.
Where mph to km/h helps
Both directions
Need the opposite? The km/h-to-mph converter is linked below and uses the exact inverse factor.
Apply the same factor to an interval
A speed of 60 mph converts to 96.56064 km/h because the factor is 1.609344. An increase of 10 mph is therefore an increase of 16.09344 km/h. Round for display only after converting; multiplying a previously rounded value can introduce avoidable differences when comparing speed logs. The result is a speed measurement and does not determine a road's legal speed limit. Preserve the original unit in exported records so a later reader can reproduce the conversion.
Before you use the result
- The result is rounded for readability, so a value converted and then converted back may differ in the last decimal place. The underlying factor is exact.
- Units in your input are ignored - only the number is read - so make sure the figure you type is really in mph.
Questions about mph to km/h
How fast is 60 mph in km/h?
Sixty miles per hour is about 96.6 km/h. The rule of thumb multiplies by 1.6, which lands just under the exact figure.
Is my data uploaded?
No. mph to km/h does the arithmetic in this browser tab; the value is calculated on your device and is not sent to a server.
Related tools
km/h to mph
Convert kph, kmh or km/h to mph with worked speed examples and a conversion formula. Compare road, cycling and treadmill speeds in kilometres and miles.