Speed Converter
Convert speed between kilometres per hour, miles per hour, metres per second, knots and feet per second, with the full conversion table and factor formula.
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About Speed Converter
Kilometres per hour, miles per hour, metres per second, knots and feet per second all measure one thing: metres travelled per second. Each unit is a fixed multiple of that base, so any pair converts with one division of two factors.
Because a knot is defined on the international nautical mile (1,852 metres), sea and air speeds convert on exactly the same table as road speeds. The printed table lists every unit's factor so you can check any pair by hand.
Questions about Speed Converter
Is 100 km/h the same as about 62 mph?
Yes — the mile is longer, so mile-based numbers are smaller. The factor is 0.62137119 mph per km/h, and one mile per hour is exactly 1.609344 kilometres per hour.
How do knots relate to km/h?
One knot is 1.852 kilometres per hour by definition of the international nautical mile. A cruise at 480 knots would be 889 km/h.
What about m/s to km/h?
Multiply metres per second by 3.6, the number of seconds in an hour scaled to kilometres. This is the shortcut used for weather and ball reports.
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