Speed, Distance & Time Formulas
Speed = Distance ÷ Time | Distance = Speed × Time | Time = Distance ÷ Speed
Speed Unit Conversions
- 1 mph = 1.60934 km/h = 0.44704 m/s
- 1 km/h = 0.62137 mph = 0.27778 m/s
- 1 m/s = 3.6 km/h = 2.23694 mph
- 1 knot = 1.852 km/h = 1.15078 mph
Frequently Asked Questions
How fast is the speed of sound? About 343 m/s (1,235 km/h or 767 mph) at sea level in dry air at 20°C.
How fast is the speed of light? 299,792,458 m/s (approximately 300,000 km/s or 186,000 mi/s).