How to use the Speed Converter
- Type the speed you want to convert.
- Choose the unit you're converting from and the unit you want.
- Read the result instantly. Use the swap button to convert the other way.
- Check the tables below for every unit and common values.
What does this tool do?
Road speeds use km/h or mph, science uses meters per second, and ships and aircraft use knots (nautical miles per hour). One knot is exactly 1.852 km/h.
Why use it?
- Convert speed limits when driving abroad.
- Wind speeds for sailing and flying.
- Physics homework in m/s.
Common speed conversions
Quick reference:
| km/h | mph | m/s |
|---|---|---|
| 30 | 18.6 | 8.33 |
| 50 | 31.1 | 13.89 |
| 80 | 49.7 | 22.22 |
| 100 | 62.1 | 27.78 |
| 120 | 74.6 | 33.33 |
The formula
mph = km/h ÷ 1.609344
m/s = km/h ÷ 3.6
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Last reviewed by the M2Toolkit team.