Convert between mph, km/h, knots, meters per second, and Mach. Instant results.
To convert miles per hour to kilometers per hour, multiply by 1.60934. For example, 60 mph = 60 × 1.60934 = 96.56 km/h. To go the other way, multiply by 0.621371.
Mach 1 (the speed of sound in air) is approximately 767 mph or 1,235 km/h at sea level at 15°C. It varies with temperature and altitude.
100 mph equals approximately 86.9 knots. One knot equals 1 nautical mile per hour, which is approximately 1.15078 mph or 1.852 km/h.
MPH (miles per hour) is used primarily in the United States and United Kingdom. KPH or km/h (kilometers per hour) is used in most other countries. 1 mph = 1.60934 km/h.
100 km/h equals approximately 62.14 mph. This is a common highway speed limit in many countries, equivalent to about 62 mph.