Speed Converter
Convert between m/s, km/h, mph, knots and ft/s instantly.
Your conversions appear here
Enter a speed and pick its unit. Every other unit is calculated live as you type — right here in your browser, with nothing sent to a server.
Runs entirely in your browserConvert any speed unit, locally
This converter turns a single speed value into every other supported unit at once. Type a number, choose the unit it is in, and the full conversion table updates as you type. It covers metres per second, kilometres per hour, miles per hour, knots and feet per second. Each conversion goes through metres per second as a common base, so results stay consistent no matter which unit you start from. A knot is one nautical mile per hour, common in aviation and marine use. Everything runs in your browser and nothing you type is uploaded anywhere.
Common questions
How do I convert km/h to mph?
Enter your speed, select km/h, and read the mph row. One kilometre per hour is about 0.621371 miles per hour, so 100 km/h is roughly 62.1 mph.
What is a knot in mph?
One knot is about 1.15078 mph (it equals one nautical mile per hour). Enter 1 and select knot to see it in mph, km/h and m/s at once.
Which units does this speed converter support?
Metres per second (m/s), kilometres per hour (km/h), miles per hour (mph), knots (kn) and feet per second (ft/s).
Why do I see “—” instead of results?
That appears when the value box is empty or is not a valid number. Enter a finite number and the full conversion list appears instantly.
Are the values I type sent anywhere?
No. All conversions run entirely in your browser with JavaScript. Nothing you enter is uploaded or stored on a server.