Speed Converter
Convert between km/h, mph, meters per second, knots, feet per second and other speed units.
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Popular speed conversions
Speed units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the meter per second (m/s).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Centimeter per second | cm/s | SI | = 0.01 m/s |
| Meter per second | m/s | SI | Base unit |
| Kilometer per hour | km/h | metric | ≈ 0.2777777778 m/s |
| Kilometer per second | km/s | SI | = 1000 m/s |
| Mile per hour | mph | US customary | = 0.44704 m/s |
| Foot per second | ft/s | US customary | = 0.3048 m/s |
| Knot | kn | other | ≈ 0.5144444444 m/s |
| Speed of light in vacuum | c | SI | = 299792458 m/s |
Meter per second quick reference
| Meter per second | Kilometer per hour | Mile per hour | Foot per second |
|---|---|---|---|
| 1 m/s | = 3.6 km/h | ≈ 2.236936292 mph | ≈ 3.280839895 ft/s |
| 10 m/s | = 36 km/h | ≈ 22.36936292 mph | ≈ 32.80839895 ft/s |
| 100 m/s | = 360 km/h | ≈ 223.6936292 mph | ≈ 328.0839895 ft/s |
| 1000 m/s | = 3600 km/h | ≈ 2236.936292 mph | ≈ 3280.839895 ft/s |
Among the 8 speed units on this page, the smallest is the centimeter per second (cm/s) and the largest is the speed of light in vacuum (c).
More speed conversions
- Meter per second to Kilometer per hourm/s → km/h
- Kilometer per hour to Meter per secondkm/h → m/s
- Knot to Kilometer per hourkn → km/h
- Meter per second to Mile per hourm/s → mph
- Kilometer per hour to Knotkm/h → kn
- Knot to Mile per hourkn → mph
- Mile per hour to Meter per secondmph → m/s
- Mile per hour to Knotmph → kn
- Foot per second to Meter per secondft/s → m/s
- Meter per second to Foot per secondm/s → ft/s
About speed units
Speed is distance per time. The SI unit is the meter per second; road speeds are usually given in kilometers per hour or miles per hour.
All factors here are exact. One mile per hour is exactly 0.44704 m/s and one knot is exactly 1852 meters per hour.
Frequently asked questions
- How do I convert km/h to mph quickly?
- Multiply by about 0.62 (or divide by about 1.61). For exact results use the converter above.
- What is a knot?
- One nautical mile per hour, exactly 1.852 km/h. It is used at sea, in aviation and for wind speeds.
- How many kilometers per hour are in one meter per second?
- One meter per second = 3.6 km/h (kilometers per hour).
- How many miles per hour are in one meter per second?
- One meter per second ≈ 2.236936292 mph (miles per hour).
- How many feet per second are in one meter per second?
- One meter per second ≈ 3.280839895 ft/s (feet per second).