Type a number of miles per hour and this converter shows the answer in kilometers per hour instantly (1 mph = 1.60934 km/h). Below the converter you will find a ready-made mph to km/h table, and further down the formula with a worked example.
Speed limits in the United States and the UK are posted in mph, and car reviews quote 0–60 mph times and top speeds in mph. Converting to km/h helps visitors respect limits (a 70 mph UK motorway limit is 112.7 km/h, a 55 mph US highway is 88.5 km/h) and lets you compare performance figures with metric publications.
How to use the MPH to KMH tool
- Enter the value in miles per hour in the Value box. Decimals such as 30.5 are fine.
- The result in kilometers per hour appears straight away, rounded to six significant digits.
- Check the formula line under the result to see exactly how it was calculated.
- Press ⇄ to convert kilometers per hour back to miles per hour, or pick any other unit from the lists.
- Use Copy result, or look up common values in the conversion table.
Why use ToolOrca MPH to KMH
- Exact factor: 1 mph = 1.60934 km/h
- Conversion table: mph to km/h
- Formula and worked example included
- Instant result as you type
- Converts to every other speed unit too
- Free, private and works offline
How to convert miles per hour to kilometers per hour
One mile per hour is exactly 1.609344 km/h, or 0.44704 m/s. One kilometer per hour is 1,000 meters in 3,600 seconds, so 3.6 km/h equals 1 m/s. So 1 mph = 1.609344 km/h exactly, and 1 km/h = 0.621371192 mph.
To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.609344.
Worked example: 60 mph × 1.609344 = 96.5606 km/h.
Quick mental math for mph to km/h
Add 60%: 50 mph + 30 = 80 km/h (exact 80.5). Or multiply by 8 and divide by 5: 30 mph × 8 ÷ 5 = 48 km/h.
Need the opposite direction? Use the kilometers per hour to miles per hour converter, or switch units with the ⇄ button above.
Frequently asked questions
How many kilometers per hour is 60 mph?
60 mph is 96.5606 km/h (60 × 1.609344 = 96.5606).
How many kilometers per hour is 70 mph?
70 mph is 112.654 km/h (70 × 1.609344 = 112.654).
How many kilometers per hour is 30 mph?
30 mph is 48.2803 km/h (30 × 1.609344 = 48.2803).
What is the formula to convert miles per hour to kilometers per hour?
To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.609344. To go the other way, use the kilometers per hour to miles per hour converter.