Speed Converter
Convert between metres per second, kilometres per hour, miles per hour, feet per second, knots, and Mach. Used in physics, aviation, automotive, and meteorology.
1 m/s = 3.59999712 km/h
1 m/s in all units
| Unit | Value |
|---|---|
| m/sinput | 1 |
| km/h | 3.59999712 |
| mph | 2.236936292 |
| ft/s | 3.280839895 |
| Knot (kn) | 1.943846172 |
| Mach | 0.002915451895 |
How to Use the Speed Converter
- 1
Select the speed unit you want to convert FROM (e.g. mph).
- 2
Enter the numeric value.
- 3
Select the unit you want to convert TO (e.g. km/h).
- 4
The result appears instantly.
- 5
Use the ⇄ swap button to reverse.
- 6
See all units in the table below.
Speed Conversion Formulas
1 mph = 1.60934 km/h = 0.44704 m/s
1 knot = 1.852 km/h = 0.514444 m/s
1 Mach = 343 m/s (at sea level, 20°C)
1 km/h = 0.277778 m/sFrequently Asked Questions
How do I convert mph to km/h?
Multiply by 1.60934. For example, 60 mph = 96.56 km/h. To convert km/h to mph, multiply by 0.62137.
What is a knot?
A knot is 1 nautical mile per hour = 1.852 km/h = 1.15078 mph. Used in aviation and maritime navigation.
What is Mach 1?
Mach 1 is the speed of sound — approximately 343 m/s (1,235 km/h) at sea level and 20°C. It varies with altitude and temperature.
How fast is the speed of light?
The speed of light is approximately 299,792,458 m/s ≈ 1,079,252,849 km/h ≈ 670,616,629 mph.