Tool
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s and Mach. Live reference table for all speed units.
About the Speed Converter
Speed units vary by context: km/h and mph for road speeds, knots for maritime and aviation, m/s for physics and science, and Mach for supersonic flight. Road signs and speedometers in the US and UK use mph while most of the world uses km/h.
Common uses: understanding speed limits when travelling abroad, converting weather wind speeds, comparing vehicle performance specifications across regions, and aviation/sailing navigation.
Quick reference: 60 mph = 96.6 km/h, 100 km/h = 62.1 mph, 30 mph = 48.3 km/h. In aviation, speed is measured in knots — 1 knot = 1.852 km/h = 1.151 mph. In science and engineering, metres per second is the standard unit: 1 m/s = 3.6 km/h. Mach 1 at sea level is approximately 1,235 km/h (767 mph), though it varies with altitude and temperature.
Wind speeds in weather forecasts use km/h in most countries and mph in the US and UK. The Beaufort scale uses knots as its baseline. Car and motorcycle performance figures are usually given in both mph and km/h in manufacturer specifications. This converter handles all of those contexts in one place.
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