Speed Converter
km/h, mph, knots, m/s and more — convert running pace, wind speed and vehicle speed instantly.
1 km/h = 0.621371 mph
All units
| meter per second (m/s) | 0.277778 |
|---|---|
| kilometer per hour (km/h) | 1 |
| mile per hour (mph) | 0.621371 |
| foot per second (ft/s) | 0.911344 |
| knot (kn) | 0.539957 |
| Mach (sea level) (Mach) | 0.000816297 |
Common conversions
Formula: 1 km/h = 0.621371 mph
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Type the amount you want to convert.
- 2Pick the unit you are converting from and the unit you are converting to.
- 3The result updates as you type — check the table below for every unit at once, or copy the result.
Speed Converter
Convert speed units used by different countries and sports: kilometers per hour, miles per hour, knots for sailing and aviation, meters per second for physics.
Useful when renting a car abroad, reading a marine forecast or comparing treadmill and outdoor paces.
It supports 6 units — meter per second, kilometer per hour, mile per hour, foot per second, knot, Mach (sea level) and more. Everything is calculated in your browser, works offline, and your data never touches a server.
Frequently asked questions
How fast is 100 km/h in mph?
100 km/h = 62.14 mph. The exact factor is 1 mph = 1.609344 km/h.
Is this converter free?
Yes — it runs entirely in your browser. There are no limits, no ads on results and no sign-up.
How accurate are the conversions?
Conversion factors follow international standard definitions (SI and NIST). Results are shown with up to 8 significant digits.
Related tools
Length Converter
Convert length and distance instantly: meters, feet, inches, miles, centimeters and more — right in your browser.
All tools →
Time Unit Converter
Seconds, minutes, hours, days, weeks, months and years — with the month/year caveat explained.
All tools →
Temperature Converter
Celsius to Fahrenheit and Kelvin, instantly. Live results plus freezing and boiling reference points.
All tools →
Pressure Converter
bar, psi, pascal, atmosphere, mmHg and more — for tires, diving, weather and HVAC.
All tools →
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/speed-converter?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — speed-converter" loading="lazy"></iframe>