Convert between kilometers per hour and miles per hour instantly. Includes step-by-step working and a quick reference speed table for common road speeds.
Below is a handy reference table for the most common speed limits and driving speeds, showing the equivalent in both kilometers per hour and miles per hour.
| km/h | mph | Context |
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This speed converter uses the standard conversion factor between kilometers per hour and miles per hour. One kilometer per hour equals approximately 0.621371 miles per hour. Conversely, one mile per hour equals 1.60934 kilometers per hour. These conversion factors are derived from the relationship between kilometers and miles: 1 mile = 1.60934 kilometers.
Speed conversion between km/h and mph is essential for many real-world situations. If you're driving in a country that uses a different speed measurement system, this converter helps you understand local speed limits. For example, if you're traveling from the United States (mph) to Europe (km/h), you can quickly convert posted speed limits to your familiar unit. This is also useful for comparing vehicle performance specifications, understanding weather reports for wind speeds, and working with international engineering data.
Kilometers per hour (km/h) is the standard unit of speed used in most countries around the world, including Europe, Asia, Africa, Australia, and South America. It represents the number of kilometers traveled in one hour.
Miles per hour (mph) is used primarily in the United States, the United Kingdom, and a few other countries. It represents the number of miles traveled in one hour. The UK uses mph for road signs but many other contexts in the UK use km/h.
For a rough mental conversion, you can use these approximate rules:
• To convert km/h to mph, divide by 1.6 (or multiply by 5/8). For example, 100 km/h ≈ 100 ÷ 1.6 ≈ 62.5 mph.
• To convert mph to km/h, multiply by 1.6 (or by 8/5). For example, 60 mph ≈ 60 × 1.6 ≈ 96 km/h.
These rough estimates are close enough for most everyday situations, but our calculator gives you the precise value using the exact conversion factor.