Kilometer per Hour to Mile per Hour Converter
Quickly and accurately convert speed measurements from kilometers per hour to miles per hour with our free online KPH to MPH Converter. Perfect for travel, sports, automotive, and more.
Common Conversions
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 1 km/h | 0.621371 mph |
| 5 km/h | 3.106856 mph |
| 10 km/h | 6.213712 mph |
| 20 km/h | 12.427424 mph |
| 30 km/h | 18.641136 mph |
| 50 km/h | 31.06856 mph |
| 60 km/h | 37.282272 mph |
| 100 km/h | 62.13712 mph |
| 120 km/h | 74.564544 mph |
How It Works
Converting from kilometers per hour (km/h) to miles per hour (mph) is a common speed conversion, especially for international travel, sports, and automotive applications. This conversion bridges the metric system (kilometers) and the imperial system (miles).
Conversion Formula:
1 kilometer per hour = 0.621371 miles per hour
To convert kilometers per hour to miles per hour, multiply the kilometers per hour value by 0.621371:
Miles per Hour = Kilometers per Hour × 0.621371
Example Calculation:
To convert 100 kilometers per hour to miles per hour:
Miles per Hour = 100 km/h × 0.621371 = 62.1371 mph
Our converter handles this calculation automatically and provides results with up to 9 decimal places for precision. It also formats the result to remove unnecessary trailing zeros for better readability.
Frequently Asked Questions
What is a kilometer per hour?
A kilometer per hour (km/h or kph) is a unit of speed in the metric system, representing the number of kilometers traveled in one hour. It’s the standard unit of speed in most countries around the world, used for vehicle speed limits, weather reports (wind speed), and sports.
What is a mile per hour?
A mile per hour (mph) is a unit of speed in the imperial and US customary systems, representing the number of miles traveled in one hour. It’s commonly used in the United States, United Kingdom, and some other countries for measuring vehicle speeds, wind speeds, and in sports.
Why would I need to convert kilometers per hour to miles per hour?
This conversion is commonly needed when traveling between countries that use different measurement systems, when reading international car specifications, or when comparing speeds in international sports events. For example, if you’re from the US traveling in Europe, you might need to convert the speed limits from km/h to mph to better understand them.
How accurate is this converter?
Our converter uses the standard conversion factor of 0.621371 miles per hour per kilometer per hour, which is accurate to the commonly accepted international standard. The calculator can display results with up to 9 decimal places for high precision needs.
What are some common speed benchmarks in both km/h and mph?
- Average walking speed: 5 km/h (3.1 mph)
- Average running speed: 8-12 km/h (5-7.5 mph)
- Typical urban speed limit: 50 km/h (31 mph)
- Highway speed limit in many countries: 100 km/h (62 mph)
- Autobahn recommended speed: 130 km/h (81 mph)
- Commercial aircraft cruising speed: ~900 km/h (560 mph)
How do I convert miles per hour back to kilometers per hour?
To convert from miles per hour to kilometers per hour, multiply the miles per hour value by 1.60934. Alternatively, you can use our Mile per Hour to Kilometer per Hour Converter for quick and accurate conversions.