Speed Converter
Convert m/s, km/h, mph, knots, ft/s.
Enter a value to convert instantly between units of speed — meters per second, kilometers per hour, miles per hour, knots and feet per second. Everything runs locally in your browser.
Your input is processed locally in your browser — nothing is uploaded, stored or logged.
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How it works
- 1 Type a value.
- 2 Pick the units to convert from and to.
- 3 Copy the result, or Swap to reverse.
Common use cases
- Convert km/h and mph for driving.
- Read boat or wind speed in knots.
- Convert running pace inputs.
- Compare speeds across units.
Frequently asked questions
Is my input sent to a server?
No. Every calculation runs locally in your browser — your input is never uploaded, stored or logged.
How fast is a knot?
1 knot = 1 nautical mile per hour = 1.852 km/h ≈ 1.151 mph.
Is it really free?
Yes — free, with no signup and no limits.