KM/H to MPH Converter
Convert kilometers per hour (km/h) to miles per hour (mph) instantly. Free online speed converter with conversion table and formula.
Why Convert Speed from KM/H to MPH?
While most of the world uses kilometers per hour (km/h), the United States and United Kingdom still use miles per hour (mph) for road speeds. Converting km/h to mph is essential when traveling to these countries, reading American or British vehicle specifications, or understanding speed references in US/UK media.
Whether you're planning a road trip in the US, watching American motorsports, or importing a vehicle, knowing how to convert km/h to mph is essential.
What is Kilometers per Hour (km/h)?
Kilometers per hour (km/h) is the standard unit of speed used in most countries worldwide. It represents the number of kilometers traveled in one hour.
- One kilometer equals 0.621371 miles
- 1 km/h = 0.621371 mph
- Standard unit for road speed limits in most countries
- Used in international shipping and aviation (along with knots)
What is Miles per Hour (mph)?
Miles per hour (mph) is a unit of speed used primarily in the United States, United Kingdom, and a few other countries. It represents the number of miles traveled in one hour.
- One mile equals 1.609344 kilometers
- 1 mph = 1.609344 km/h
- Used for road speed limits in the US and UK
- Standard in American automotive industry
KM/H to MPH Conversion Formula
To convert kilometers per hour to miles per hour, use the following formula:
Or equivalently:
Conversion Table: KM/H to MPH
Here is a quick reference table for common speed conversions:
| Kilometers per Hour (km/h) | Miles per Hour (mph) | Common Use |
|---|---|---|
| 10 km/h | 6.21 mph | Walking speed |
| 20 km/h | 12.43 mph | Cycling speed |
| 30 km/h | 18.64 mph | School zone limit |
| 50 km/h | 31.07 mph | Urban area limit |
| 80 km/h | 49.71 mph | Rural road speed |
| 100 km/h | 62.14 mph | Highway speed |
| 110 km/h | 68.35 mph | Autobahn advisory |
| 120 km/h | 74.56 mph | European motorway limit |
| 130 km/h | 80.78 mph | High-speed motorway |
| 200 km/h | 124.27 mph | High-performance vehicles |
| 300 km/h | 186.41 mph | Formula 1 racing |
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About KM/H to MPH Converter
Our free KM/H to MPH converter tool makes it easy to convert speed measurements from kilometers per hour to miles per hour. Whether you're traveling to the US or UK, comparing vehicle specifications, or understanding American speed limits, this tool provides instant and accurate conversions.
How to Use This Tool
- Enter the speed in kilometers per hour (km/h)
- The conversion to miles per hour will appear automatically
- View the result instantly
Common Uses
- Travel: Understanding speed limits in the US and UK
- Automotive: Converting European car specs for US market
- Sports: Understanding American motorsports speeds
- Shipping: International logistics speed calculations
Quick Reference
- 50 km/h = 31.07 mph
- 100 km/h = 62.14 mph
- 120 km/h = 74.56 mph
- 200 km/h = 124.27 mph