About the Speed Converter
Convert speeds for driving, running, aviation and sailing: km/h, mph, m/s, ft/s and knots.
Key features
- Convert m/s, km/h, mph, knots and ft/s
- Exact factors from defined length units
- Useful for driving, running, aviation and physics
- Swap direction with one click
- See the value in every unit at once
- Free, instant, no sign-up
Speed and velocity conversion
Convert speeds between metric and imperial units for road trips abroad, treadmill settings, wind speeds, boating and physics problems.
Common conversions
| From | To | Multiply by |
|---|---|---|
| km/h | mph | 0.621371 |
| mph | km/h | 1.609344 |
| m/s | km/h | 3.6 |
| km/h | m/s | 0.277778 |
| Knots | km/h | 1.852 |
| Knots | mph | 1.15078 |
| ft/s | m/s | 0.3048 |
Speed limit reference
| km/h | mph |
|---|---|
| 30 | 18.6 |
| 50 | 31.1 |
| 80 | 49.7 |
| 100 | 62.1 |
| 120 | 74.6 |
| 130 | 80.8 |
Interesting speeds
| Example | Speed |
|---|---|
| Walking | ~5 km/h (3.1 mph) |
| Elite marathon pace | ~21 km/h (13 mph) |
| Cheetah sprint | ~110 km/h (68 mph) |
| Commercial jet cruise | ~900 km/h (~485 knots) |
| Speed of sound (sea level, 20 °C) | 343 m/s (1,235 km/h) |
Related converters
Convert distances with the Length Converter and durations with the Time Converter.
How to use the Speed Converter
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.