KM/H to MPH Converter
Convert kilometers per hour (km/h) to miles per hour (mph). One kilometer per hour equals 0.621371 miles per hour, so multiply a value in kilometers per hour by 0.621371 to get miles per hour.
Formula: multiply the source value by 0.62137119
Quick Conversions
About this tool
One kilometer per hour is 1,000 meters covered in 3,600 seconds. One mile per hour is 1,609.344 meters covered in 3,600 seconds. Because 1 mile per hour is 1.609344 kilometers per hour, one kilometer per hour is 1 ÷ 1.609344 = 0.621371192237 miles per hour.
How to use it
- Type a value in kilometers per hour in the first field. The unit menus start on km/h → mph.
- Read the result in miles per hour. It updates as you type; use Precision to choose how many decimals are shown.
- Press the swap button, or open the MPH to KM/H converter, to convert miles per hour back to kilometers per hour.
mph = km/h × 0.621371192237
km/h = mph ÷ 0.621371192237
Examples
50 km/h to mph (a common urban speed limit)
50 km/h × 0.621371 = 31.0686 mph.
100 km/h to mph
100 km/h × 0.621371 = 62.1371 mph.
130 km/h to mph
130 km/h × 0.621371 = 80.7783 mph.
Kilometers per hour to miles per hour conversion table
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 | 0.621371 |
| 2 | 1.24274 |
| 3 | 1.86411 |
| 4 | 2.48548 |
| 5 | 3.10686 |
| 10 | 6.21371 |
| 15 | 9.32057 |
| 20 | 12.4274 |
| 25 | 15.5343 |
| 50 | 31.0686 |
| 100 | 62.1371 |
| 250 | 155.343 |
| 500 | 310.686 |
| 1,000 | 621.371 |
Miles per hour to kilometers per hour (reverse)
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 1 | 1.60934 |
| 5 | 8.04672 |
| 10 | 16.0934 |
| 50 | 80.4672 |
| 100 | 160.934 |
FAQ
How many miles per hour are in one kilometer per hour?
One kilometer per hour is 0.621371 miles per hour. The unrounded factor is 0.621371192237.
How do I convert miles per hour back to kilometers per hour?
Divide by 0.621371, or multiply by 1.60934. For example, 10 mph is 16.0934 km/h.
What are common speed limits in mph?
Multiply by 0.621371: 50 km/h is about 31.07 mph, 100 km/h is about 62.14 mph, and 130 km/h is about 80.78 mph.
Is the conversion exact?
Yes, before rounding. Each unit is an exact distance (1 km, 1,609.344 m, 1 m, or 1,852 m) over an exact time, so the factors are exact ratios.