Speed Converter
Convert between any two units of speed — miles per hour, kilometres per hour, metres per second, knots, feet per second and more.
60 Miles per hour (mph) =
96.56
Converted via 0.44704 m/s per mph and 0.2777777777777778 m/s per km/h. Imperial factors are exact under the 1959 International Yard and Pound Agreement; the nautical mile is 1852 m exactly (ISO 80000-3).
How to use this calculator
Enter your speed, choose its unit in the "From" dropdown, then pick the unit you want in the "To" dropdown. The result updates as you type.
How the calculation works
Every unit converts via a single intermediate value in metres per second. We multiply your input by the m/s factor for the source unit, then divide by the factor for the target. The mile-based factor is exact (1 mile = 1609.344 m, 1959 yard agreement) and the nautical mile is exact (1852 m, ISO 80000-3), so mph ↔ km/h ↔ knots conversions are exact to floating-point precision.
Worked example
60 mph → km/h: 60 × 0.44704 m/s per mph = 26.8224 m/s, ÷ (1000/3600) m/s per km/h = 96.5606 km/h.
Frequently asked questions
How many km/h is 60 mph?
60 mph = 96.5606 km/h. The exact conversion factor is 1.609344 km per mile (1959 international yard agreement), so multiply mph by 1.609344 to get km/h.
What is a knot?
One knot is one nautical mile per hour. A nautical mile is exactly 1852 metres (ISO 80000-3), giving 1 knot = 0.514444 m/s ≈ 1.852 km/h ≈ 1.151 mph. Knots are used in marine and aviation navigation because one nautical mile is roughly one minute of arc of latitude.
What does Mach 1 mean here?
Mach 1 is the speed of sound. We use the ICAO standard atmosphere value at sea level, 15 °C dry air: 340.29 m/s (≈ 761.2 mph, 1225.0 km/h). Real-world Mach 1 varies with altitude and air temperature — it is roughly 295 m/s at the cruise altitude of a passenger jet.
How is the speed of light defined?
The speed of light in vacuum is exactly 299,792,458 metres per second. This is not a measured value — since 1983 the metre has been defined in terms of the second and this fixed speed, so c is exact by SI definition.
How accurate are the results?
Results use full IEEE-754 double-precision arithmetic. The display rounds for readability, but the underlying conversion factors are exact for mph, km/h, m/s, ft/s, knots and the speed of light. Mach 1 depends on atmospheric conditions, so the value shown assumes ICAO standard sea level.