40 mph to km/h
64.37 km/h
40 miles per hour equals 64.3738 kilometres per hour.
How the conversion works
One mph is 1.609344 km/h, so multiply:
40 × 1.609344 = 64.3738 km/h
Going the other way, divide by 1.609344 instead: 65 km/h to mph — the closest published value to 64.37 km/h.
Convert a different speed
mph =64.37 km/h
Open the full speed converter for every other unit.
Nearby values
Questions
- What is 40 mph in km/h?
- 40 mph is 64.37 km/h (64.3738 km/h to four decimal places).
- How do you convert mph to km/h?
- Multiply by 1.609344. One mph is 1.609344 km/h, so 40 × 1.609344 = 64.3738 km/h.
- What does 40 mph actually mean?
- It sits between 30 and 55 mph; the table on this page shows how those compare.