Common conversions
| From | To |
|---|---|
| 100 km/h | 62.14 mph |
| 60 mph | 96.56 km/h |
| 1 m/s | 3.6 km/h |
| 1 knot | 1.852 km/h = 1.151 mph |
| Mach 1 | ≈ 1,225 km/h at sea level |
Knots are used in aviation and at sea; m/s in science and weather (wind speed). Mach uses the speed of sound at sea level in standard conditions; at altitude it is lower.
Frequently asked questions
How fast is 120 km/h in mph?
About 74.6 mph.
Why do ships and planes use knots?
A nautical mile relates to latitude, which makes navigation calculations easier.
Is Mach a fixed speed?
No, it depends on air temperature; the value here is for sea level.