The speed converter works like this: it converts between km/h, mph, m/s, knots and feet per second. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Speed Converter
Enter or paste the source value.
Confirm the source and target units or formats.
Read the converted result, which updates live as you type.
Copy the output when you are happy with it.
Features
Convert mph to km/h, knots, meters per second
Instant result, no page reload
Works in any modern browser, desktop or mobile
Free with no signup
Common mistakes to avoid
Selecting a near-neighbor unit instead of the intended one
Forgetting whether a value is a rate or a total
Examples
Input
Result
100 km/h
62.137 mph · 27.778 m/s · 53.996 knots
Best used for
Getting a reliable answer for speed converter without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Conversion runs locally in your browser tab.
Frequently asked questions
Why do aviation and maritime use knots?
One knot is one nautical mile per hour, matching latitude-minute navigation - speed and position share the same units.
When do I need knots instead of km/h?
Aviation and marine speeds are quoted in knots (nautical miles per hour) worldwide - the converter handles the exact 1.852 factor between them.
How fast is 1 m/s in everyday terms?
One metre per second is 3.6 km/h or about 2.24 mph, which makes the conversion a quick sanity check between physics units and road signs.