Speed Converter
Convert between mph, km/h, m/s and knots.
Speed limits, pace, wind speed, and vehicle specs all get reported in different units depending on the country and context — this converts between mph, km/h, m/s, and knots.
Where knots still matter
Knots remain the standard unit in aviation and maritime navigation worldwide, even in countries that otherwise use metric for everything else.
Frequently asked questions
Why do some countries post speed limits in km/h and others in mph?
It follows each country's broader unit system — most of the world uses km/h, a small number including the US and UK still use mph.
Is a knot the same as a mile per hour?
No — a knot is based on a nautical mile, so 1 knot ≈ 1.15 mph, not exactly equal.