Speed Converter
Convert speed — m/s, km/h, mph, feet per second, knots and Mach.
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What Is the Speed Converter?
The Speed Converter converts between meters per second, kilometers per hour, miles per hour, feet per second, knots and Mach. Enter a value in any unit and read the equivalent in all the others. Everything runs in your browser.
How It Works
Type a speed, choose the unit it's in and the unit you want, and the result updates instantly. The swap button reverses the pair and the table shows every unit at once.
When to Use It
Use it for driving (km/h ↔ mph), running and cycling pace, aviation and sailing (knots, Mach), wind speeds, or physics homework.
Frequently Asked Questions
- What is Mach based on?
- Mach 1 is the speed of sound, which varies with air conditions. This tool uses the sea-level value of about 343 m/s, so Mach figures are approximate.
- What's a knot?
- One knot is one nautical mile per hour (≈1.852 km/h), used in aviation, shipping and meteorology.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.
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