Speed Converter
Convert between 7 speed units: m/s, km/h, mph, ft/s, knots, Mach and the speed of light, with live results and the exact formula shown.
How speed conversion works
All units convert through meters per second, the SI unit. Each unit has one fixed factor (1 mph = 0.44704 m/s exactly), so any pair converts in a single step.
Knots and Mach
A knot is one nautical mile per hour (1.852 km/h), used in aviation and sailing. Mach 1 is the speed of sound, about 1,225 km/h at sea level, though it varies with temperature and altitude.