Mile per Hour to Kilometer per Hour Converter
Quickly and accurately convert speed measurements from miles per hour to kilometers per hour with our free online MPH to KPH Converter. Perfect for travel, sports, automotive, and more.
Common Conversions
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 1 mph | 1.60934 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 15 mph | 24.1401 km/h |
| 25 mph | 40.2335 km/h |
| 30 mph | 48.2802 km/h |
| 55 mph | 88.5137 km/h |
| 65 mph | 104.6071 km/h |
| 70 mph | 112.6538 km/h |
How It Works
Converting from miles per hour (mph) to kilometers per hour (km/h) is a common speed conversion, especially for international travel, sports, and automotive applications. This conversion bridges the imperial system (miles) and the metric system (kilometers).
Conversion Formula:
1 mile per hour = 1.60934 kilometers per hour
To convert miles per hour to kilometers per hour, multiply the miles per hour value by 1.60934:
Kilometers per Hour = Miles per Hour × 1.60934
Example Calculation:
To convert 55 miles per hour to kilometers per hour:
Kilometers per Hour = 55 mph × 1.60934 = 88.5137 km/h
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 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.
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.
Why would I need to convert miles per hour to kilometers 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 your familiar mph speeds to km/h to understand local speed limits.
How accurate is this converter?
Our converter uses the standard conversion factor of 1.60934 kilometers per hour per mile 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 mph and km/h?
- Average walking speed: 3.1 mph (5 km/h)
- Average running speed: 5-7.5 mph (8-12 km/h)
- US residential speed limit: 25 mph (40 km/h)
- US highway speed limit: 55-70 mph (89-113 km/h)
- UK motorway speed limit: 70 mph (113 km/h)
- Commercial aircraft cruising speed: ~560 mph (900 km/h)
How do I convert kilometers per hour back to miles per hour?
To convert from kilometers per hour to miles per hour, multiply the kilometers per hour value by 0.621371. Alternatively, you can use our Kilometer per Hour to Mile per Hour Converter for quick and accurate conversions.