Speed GunGUIDE · UNITS
km/h, mph, and m/s: Speed Unit Conversion at a Glance
Korean baseball broadcasts use km/h, while Major League Baseball in the US uses mph. Scientific calculations use m/s. The same speed can look very different in different units, so convert to the same unit before comparing.
Conversion formulas
- 1 mph = 1.609344 km/h
- 1 m/s = 3.6 km/h
- km/h → mph: km/h ÷ 1.609344
- mph → km/h: mph × 1.609344
- m/s → km/h: m/s × 3.6
Common speed conversion chart
| km/h | mph | m/s | Reference |
|---|---|---|---|
| 80 | 49.7 | 22.2 | Little League pitcher |
| 100 | 62.1 | 27.8 | |
| 120 | 74.6 | 33.3 | High school breaking ball range |
| 130 | 80.8 | 36.1 | |
| 140 | 87.0 | 38.9 | |
| 145 | 90.1 | 40.3 | Around the KBO average fastball |
| 150 | 93.2 | 41.7 | |
| 160 | 99.4 | 44.4 | Flamethrower |
| 200 | 124.3 | 55.6 | Pro tennis serve |
Quick mental math
To convert km/h to mph, just remember "multiply by 0.6" (0.621 to be exact). 150 km/h is about 90 mph, and 100 mph is about 160 km/h. To convert m/s to km/h, multiply by 3.6.
Changing units in the app
The Speed Gun app automatically picks km/h or mph based on your phone's region, and you can switch to km/h, mph, or m/s in Settings. Tap the unit label on the measurement screen to switch instantly.