Speed Converter
Convert between km/h, mph, m/s and knots.
About this calculator
Speed shows up in different units depending on context, a car's speedometer in mph or km/h depending on the country, a weather report's wind speed in knots, a physics problem in metres per second, and mixing them up when planning a drive abroad or interpreting a forecast can lead to real misjudgement. This calculator converts a value between kilometres per hour, miles per hour, metres per second, feet per second and knots by routing through a common base unit of metres per second, so any pair converts exactly using precise multipliers like 0.44704 m/s per mph. It's a quicker and more reliable alternative to mentally scaling by "roughly 0.6" for km/h to mph, especially useful for travellers adjusting to a foreign speed limit, sailors converting knots, or students working through physics problems.
Worked example
100 km/h to mph
Result: 62.14 mph
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