Speed Converter — Free Online Tool
Convert speed units online for free. Supports mph, km/h, m/s, knots, and Mach number. Perfect for travel, physics, aviation, and sports speed conversion.
About Speed Converter
Speed conversion is needed across many fields: road travel (miles per hour vs kilometres per hour), aviation (knots and Mach numbers), physics and science (metres per second), maritime navigation, and sports performance measurement. Our speed converter supports kilometres per hour, miles per hour, metres per second, knots (nautical miles per hour), feet per second, and Mach number. Enter any speed value and see all equivalents instantly.
Frequently Asked Questions
How many km/h in 1 mph?
1 mph = 1.60934 km/h. Conversely, 1 km/h = 0.621371 mph.
What is a knot?
A knot is 1 nautical mile per hour = 1.852 km/h = 1.15078 mph. Used in maritime and aviation navigation.
What is Mach 1?
Mach 1 is the speed of sound at sea level = approximately 343 m/s = 1235 km/h = 767 mph.
How fast is the speed of light?
The speed of light is approximately 1,079,252,848 km/h.
What units do Formula 1 teams use?
F1 uses km/h for speed measurement.