Speed Converter
Convert mph, km/h, knots, meters per second and feet per second.
Converted to every unit
About this speed converter
Speed limits, weather reports, flight and boating speeds and physics problems all use different units. This converter switches between miles per hour, kilometers per hour, knots, meters per second and feet per second.
Knots are nautical miles per hour and are standard in aviation and marine weather forecasts.
How to use the Speed Converter
- Type the value you want to convert.
- Choose the unit you're converting from and the unit you want.
- Read the result — the table below shows the value in every other unit.
- Use Swap to reverse the conversion.
Conversion factors
1 mph = 1.609344 km/h · 1 kn = 1.852 km/h · 1 m/s = 3.6 km/h
Meters per second are the base. 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s, 1 knot = 1,852 m per hour (≈ 0.5144 m/s) and 1 ft/s = 0.3048 m/s.
Worked example
A 65 mph highway speed is 65 × 1.609344 = 104.6 km/h. A 30-knot wind is about 34.5 mph.
Common conversions
| Miles per hour → Kilometers per hour | 1 mph = 1.609344 km/h | 5 mph = 8.04672 km/h | 10 mph = 16.09344 km/h |
|---|---|---|---|
| Kilometers per hour → Miles per hour | 1 km/h = 0.621371 mph | 5 km/h = 3.106856 mph | 10 km/h = 6.213712 mph |
| Knot → Miles per hour | 1 kn = 1.150779 mph | 5 kn = 5.753897 mph | 10 kn = 11.507794 mph |
| Meters per second → Kilometers per hour | 1 m/s = 3.6 km/h | 5 m/s = 18 km/h | 10 m/s = 36 km/h |
Tips for better results
- To estimate km/h from mph, multiply by 1.6.
- Divide km/h by 3.6 to get meters per second.
Frequently asked questions
Is a knot faster than a mile per hour?
Yes. One knot is about 1.15 mph.
What is 100 km/h in mph?
About 62.14 mph.
Last reviewed: October 2026 · Results are calculated in your browser.