Speed Converter
Convert among m/s, km/h, miles per hour (mph), feet per second (ft/s), and knots (kn).
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Formula
km/h = mph × 1.609344
Example
Example: convert 70 miles per hour to kilometers per hour.
70 mph = 112.65408 km/h
Conversion table
| miles per hour (mph) | kilometers per hour (km/h) |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
Explanation
Miles per hour are used in the United States and the United Kingdom for road speeds, while Kilometers per hour are used in most countries for road speed limits.
How to convert miles per hour to kilometers per hour
- Start with the value in miles per hour (mph).
- Multiply it by 1.609344.
- The result is the measurement in kilometers per hour (km/h).
Example: 70 mph → 112.65408 km/h
Frequently Asked Questions
How much is 70 miles per hour in kilometers per hour?
70 miles per hour is about 112.654 kilometers per hour.
How many kilometers per hour is 1 mile per hour?
1 mile per hour equals 1.609344 kilometers per hour.
How many miles per hour is 1 kilometer per hour?
1 kilometer per hour is about 0.621371 miles per hour.
What is the difference between miles per hour and kilometers per hour?
Both measure speed, but they use different distance and time units. Miles per hour express speed in miles and hours (mph). Kilometers per hour express it in kilometers and hours (km/h).
Where are miles per hour and kilometers per hour used?
Miles per hour are used for road speeds and speed limits in the US and in some UK contexts. Kilometers per hour are used mainly for road-vehicle speeds and transport (in most countries).
Why does 1 mile per hour equal 1.609344 kilometers per hour?
Because the units are defined from distance and time units (for example, kilometers/hours or feet/seconds), which determines the conversion factor.