This speed converter switches between m/s, km/h, mph, and knots with exact factors.
Conversion
Speed Conversion
Convert km/h, m/s, mph and other speed units.
Calculator
About this calculator
Formula notes
1 m/s = 3.6 km/h ≈ 2.237 mph ≈ 1.944 knots.
Worked examples
- Example: 100 km/h ≈ 27.78 m/s ≈ 62.14 mph ≈ 54 knots.
- A speed of 10 m/s equals 36 km/h and approximately 22.37 mph.
How to use it
- Enter the speed in the unit you have.
- Read all other unit equivalents.
- Use knots for aviation and marine contexts.
Frequently asked questions
Why is a knot used at sea?
One knot is one nautical mile per hour, and nautical miles match latitude minutes on charts.
Is mph exact relative to km/h?
Yes. 1 mile = 1.609344 km exactly, so 100 km/h = 62.137 mph.
Limits and interpretation
- The conversion treats speed as a scalar and does not preserve direction, acceleration, or changing velocity over time.
- Average speed over a trip can differ materially from an instantaneous instrument reading.