Speed converter
Convert km/h, m/s, mph, knots and feet per second.
Result
0.621371 mph
Equivalence1 km/h = 0.621371 mph
How the calculation works
Pick the source and target units: the value is converted instantly in your browser, using the quantity's base unit as an internal reference.
Frequently asked questions
Are the conversions exact?
We use official conversion factors. The result is rounded for display, but the calculation is precise.
Updated on June 17, 2026 · by Rafael Rossi · Methodology & sources