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Speed Converter
Convert between 5 different speed units instantly. Free, accurate, and easy to use.
Available Speed Units
Meter/Second
mps
Kilometer/Hour
kph
Mile/Hour
mph
Knot
kn
Foot/Second
fps
Popular Speed Conversions
Frequently Asked Questions
How do I convert km/h to mph?
To convert kilometers per hour to miles per hour, multiply by 0.621371. For example, 100 km/h = 62.14 mph.
What is a knot in speed terms?
A knot is one nautical mile per hour, equal to approximately 1.852 km/h or 1.151 mph. It is used in maritime and aviation navigation.
How fast is Mach 1?
Mach 1 is the speed of sound, approximately 1,235 km/h (767 mph) at sea level and 20°C. It varies with temperature and altitude.