UnitConMPH to KM/H Converter
Convert miles per hour to kilometers per hour for driving speeds, vehicle specifications, and international road sign interpretation. This is one of the most searched speed conversions for travelers between the US and metric-system countries.
Formula
Multiply miles per hour by 1.60934 to get kilometers per hour. To reverse, divide kilometers per hour by 1.60934 to get miles per hour.
Quick reference
| Mile per Hour (mph) | Kilometer per Hour (km/h) |
|---|---|
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.6541 |
| 80 | 128.7475 |
| 90 | 144.841 |
| 100 | 160.9344 |
| 120 | 193.1213 |
About these units
Mile per Hour
Miles per hour became the standard road speed unit in the US and UK as the automobile spread in the early 20th century. It ties directly to the statute mile, which dates to English law of 1593.
Kilometer per Hour
Kilometers per hour emerged as the standard road speed unit in metric countries during the 20th century. It is now the official unit on road signs in over 170 countries and is required by EU law for vehicle speedometers.
Frequently asked questions
60 × 1.60934 ≈ 96.56 km/h.
100 ÷ 1.60934 ≈ 62.14 mph.
Multiply by 1.6. For example, 50 mph × 1.6 = 80 km/h (exact: 80.47 km/h).