Speed Converter
Convert speeds between km/h, mph, m/s, knots and ft/s instantly.
Enter a speed in any unit and the rest update instantly. Covers km/h, mph, m/s, knots and ft/s, with one-click copy — runs entirely in your browser.
Speed Converter
Convert speeds between km/h, mph, m/s, knots and ft/s instantly.
About this tool
Enter a speed in any unit and the rest update instantly. Covers km/h, mph, m/s, knots and ft/s, with one-click copy — runs entirely in your browser.
FAQ
Common questions and answers about this topic.
Why is Mach not included?
The speed of sound changes with temperature and altitude — about 340 m/s at sea level on a 15°C day, but roughly 295 m/s at cruising altitude. A single fixed factor would look precise while being wrong, so this tool leaves Mach out rather than pretending.
What exactly is a knot?
One knot is one nautical mile per hour, which is exactly 1.852 km/h. It is the standard unit in shipping and aviation because a nautical mile matches one minute of latitude on a chart.
How do I convert km/h to m/s in my head?
Divide by 3.6. So 36 km/h is 10 m/s, and 100 km/h is about 27.8 m/s. Going the other way, multiply by 3.6.