💨 Speed Converter
mph, kph, m/s, knots and Mach
About this calculator
Convert between km/h, mph, m/s, knots, and ft/s. Enter a speed in any unit and see the rest — essential when a recipe, spec sheet, or weather report uses the "wrong" system. Uses exact factors based on the international mile, and also covers pace units like minutes per kilometre for runners plus Mach numbers for the aviation-curious.
Tip: 100 km/h is about 62 mph, and 1 m/s equals 3.6 km/h — the two conversions that come up most often in daily life.