Speed converter
Km/h, mph, metres per second, knots.
Runs in your browserNo sign-upNo watermark
Quick answer
To convert speed units, type a number, choose the unit you have and the unit you want. The answer updates as you type.
1 km/h = 0.6213711922 mph
1 km/h in every speed unit
| Metre per second | 0.2777777778 m/s |
|---|---|
| Kilometre per hour | 1 km/h |
| Mile per hour | 0.6213711922 mph |
| Knot | 0.5399568035 kn |
| Foot per second | 0.9113444153 ft/s |
| Mach (at sea level) | 0.0008162972105 Ma |
How to use the speed tool
- Type the number you want to convert.
- Choose the unit you have in "From" and the one you want in "To".
- Read the answer. The ⇄ button swaps the two units, and the table shows every unit at once.
This speed converter uses exact conversion factors and shows the result with up to 10 significant digits.
Common questions
How do I convert km/h to mph?
Divide by 1.609. So 100 km/h is about 62.1 mph.
What is a knot?
One nautical mile per hour, which is 1.852 km/h. Ships and aircraft use it.
How accurate is it?
It uses the exact defined conversion factors and shows up to 10 significant digits, so rounding noise is hidden but real precision is kept.
Does it work offline?
Once the page has loaded, yes: it calculates in your browser and sends nothing anywhere.