How many miles per hour are in 1 kilometer per hour?

1 kilometer per hour equals 0.621371 mph.

How do I convert miles per hour back to kilometers per hour?

Use the reverse converter: 1 mile per hour equals 1.60934 km/h.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert kilometers per hour to miles per hour, multiply the value by 0.621371192.

mph = km/h × 0.621371192

40 km/h × 0.621371192 = 24.85 mph

Kilometer Per Hour (km/h): Used for road speed limits and vehicle speeds in most countries.
Mile Per Hour (mph): Used for road speed limits in the US and UK. Exactly 0.44704 metres per second.

How do I convert kilometers per hour to miles per hour?: To convert kilometers per hour to miles per hour, multiply the value by 0.621371192.
How many miles per hour are in 1 kilometer per hour?: 1 kilometer per hour equals 0.621371 mph.
How many miles per hour are in 10 kilometers per hour?: 10 km/h equals 6.21371 mph.
How do I convert miles per hour back to kilometers per hour?: Use the reverse converter: 1 mile per hour equals 1.60934 km/h.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.