Convert Miles per Hour to Kilometers per Hour — Instantly
Convert miles per hour to kilometers per hour (km/h) instantly using the formula km/h = mph × 1.609344. Includes a calculator, conversion table, worked examples, and FAQs.
Miles per hour to kilometers per hour converter
Quick Reference
Miles per Hour to Kilometers per Hour Conversion Table
Common mph to km/h conversions at a glance, using the exact relationship 1 mph = 1.609344 km/h.
| Miles per Hour (mph) | Calculation | Kilometers per Hour (km/h) |
|---|---|---|
| 1 mph | 1 × 1.609344 | 1.609344 km/h |
| 5 mph | 5 × 1.609344 | 8.04672 km/h |
| 10 mph | 10 × 1.609344 | 16.09344 km/h |
| 20 mph | 20 × 1.609344 | 32.18688 km/h |
| 30 mph | 30 × 1.609344 | 48.28032 km/h |
| 40 mph | 40 × 1.609344 | 64.37376 km/h |
| 50 mph | 50 × 1.609344 | 80.4672 km/h |
| 60 mph | 60 × 1.609344 | 96.56064 km/h |
| 70 mph | 70 × 1.609344 | 112.65408 km/h |
| 80 mph | 80 × 1.609344 | 128.74752 km/h |
| 100 mph | 100 × 1.609344 | 160.9344 km/h |
| 120 mph | 120 × 1.609344 | 193.12128 km/h |
Step-by-Step
How to Convert Miles per Hour to Kilometers per Hour
Converting mph to km/h is simple when you multiply the speed by 1.609344.
The Formula
Miles per hour and kilometers per hour are both standard units of speed used in transport, driving, motorsports, logistics, and technical measurements. The exact relationship is 1 mph = 1.609344 km/h.
To convert kilometers per hour back to miles per hour, divide by 1.609344.
How to Turn mph into km/h — Step by Step
Write down the speed value
Identify the number of miles per hour you want to convert — for example, 70 mph.
Multiply by 1.609344
70 mph × 1.609344 = 112.65408 km/h. This gives you the equivalent speed in kilometers per hour.
Label your answer
Always write the unit (km/h) after the number so the result is clear and unambiguous.
mph vs km/h
What Is the Difference Between Miles per Hour and Kilometers per Hour?
Miles per hour and kilometers per hour are both units of speed. Miles per hour are commonly used in the United States and a few other places for road speeds, while kilometers per hour are widely used internationally for roads, transport, and vehicle specifications.
The relationship used on this page is: 1 mph = 1.609344 km/h. To convert miles per hour to kilometers per hour, multiply the number of mph by 1.609344.
For example, 30 mph = 48.28032 km/h, 60 mph = 96.56064 km/h, and 100 mph = 160.9344 km/h.
This conversion is exact and is commonly used for driving, road speed limits, travel planning, car specifications, motorsports, and international transport.
Worked Examples
Sample mph to km/h Calculations
Here is how to calculate miles per hour to kilometers per hour for commonly searched values.
10 mph to km/h
10 × 1.609344 = 16.09344 km/h. Ten miles per hour equals about 16.09 kilometers per hour.
20 mph to km/h
20 × 1.609344 = 32.18688 km/h. Twenty miles per hour equals about 32.19 kilometers per hour.
30 mph to km/h
30 × 1.609344 = 48.28032 km/h. Thirty miles per hour equals about 48.28 kilometers per hour.
40 mph to km/h
40 × 1.609344 = 64.37376 km/h. Forty miles per hour equals about 64.37 kilometers per hour.
50 mph to km/h
50 × 1.609344 = 80.4672 km/h. Fifty miles per hour equals about 80.47 kilometers per hour.
60 mph to km/h
60 × 1.609344 = 96.56064 km/h. Sixty miles per hour equals about 96.56 kilometers per hour.
70 mph to km/h
70 × 1.609344 = 112.65408 km/h. Seventy miles per hour equals about 112.65 kilometers per hour.
100 mph to km/h
100 × 1.609344 = 160.9344 km/h. One hundred miles per hour equals about 160.93 kilometers per hour.
FAQ
Frequently Asked Questions
Everything you need to know about converting miles per hour to kilometers per hour.