km/h to mph Calculator
📚 Examples, Formula, and How To
📝 km/h to mph Formula
km/h to mph
mph = km/h × 0.621371Multiply the speed in kilometers per hour by 0.621371 to get miles per hour
mph to km/h
km/h = mph ÷ 0.621371Divide the speed in miles per hour by 0.621371 to get kilometers per hour
💡 Converting km/h to mph
Example 1
Convert: 100 km/h to mph
Start with the conversion formula: mph = km/h × 0.621371
Substitute the value: mph = 100 × 0.621371
Calculate: 100 × 0.621371 = 62.137
Example 2
Convert: 60 mph to km/h
Start with the conversion formula: km/h = mph ÷ 0.621371
Substitute the value: km/h = 60 ÷ 0.621371
Calculate: 60 ÷ 0.621371 = 96.56
📊 km/h to mph Conversion Table
Common km/h to mph Conversions
| km/h | mph |
|---|---|
| 20 km/h | 12.4 mph |
| 30 km/h | 18.6 mph |
| 50 km/h | 31.1 mph |
| 60 km/h | 37.3 mph |
| 80 km/h | 49.7 mph |
| 100 km/h | 62.1 mph |
| 120 km/h | 74.6 mph |
| 160 km/h | 99.4 mph |
| 200 km/h | 124.3 mph |
All values are rounded to 4 decimal places for practical use
⚙️ How to Convert km/h to mph
Conversion Factor
1 km/h equals 0.621371 mph
This is the standard conversion factor between metric and imperial speed.
km/h to mph
Multiply km/h by 0.621371 to get mph
Enter a value in the km/h field to convert to mph.
mph to km/h
Divide mph by 0.621371 to get km/h
Enter a value in the mph field to convert to km/h.
📚 What are km/h and mph?
📏 Kilometers per Hour(km/h)
Definition:
Kilometers per hour is a unit of speed expressing the number of kilometers traveled in one hour. It is the standard unit of speed in most countries.
History:
The km/h unit became widely used with the adoption of the metric system in the 19th and 20th centuries. It replaced various local speed measurements.
Common Uses:
- Vehicle speedometers in metric countries
- Speed limits on roads and highways
- Weather reports for wind speed
- Athletic performance measurements
- Transportation planning and logistics
Fun Fact:
The fastest land animal, the cheetah, can run at speeds up to 120 km/h! Most cars have speedometers that go up to 200+ km/h.
📏 Miles per Hour(mph)
Definition:
Miles per hour is a unit of speed expressing the number of miles traveled in one hour. It is commonly used in the United States and United Kingdom.
History:
Miles per hour has been used since horse-drawn vehicles and became standardized with the development of automobiles in the early 20th century.
Common Uses:
- Vehicle speedometers in the US and UK
- Speed limits and traffic regulations
- Aviation speeds for small aircraft
- Sports and racing measurements
- Marine navigation and boat speeds
Fun Fact:
The first speed limit was 10 mph in the UK in 1861! Today, some highways in Texas have speed limits of 85 mph (137 km/h).