Speed Converter
Convert speed between kilometers per hour, miles per hour, meters per second, and knots. The form asks for a Value, From unit, and To unit, then displays the selected result and the equivalent values in every supported unit.
Use it for road speeds, wind speeds, running analysis, navigation, aviation, or physics. For distance-specific shortcuts, see the miles to kilometers calculator, knots to MPH calculator, or feet per second to meters per second calculator.
How to use this calculator
- Enter the speed value.
- Select km/h, mph, m/s, or knots as the source unit.
- Choose the target unit.
- Read the rounded result and reference conversions.
Conversion formula
The calculator generally converts through km/h, with a few direct directional factors for knots.
| Conversion | Factor |
|---|---|
| 1 mph | 1.60934 km/h |
| 1 m/s | 3.6 km/h |
| 1 knot | 1.852 km/h |
| 1 km/h | 0.621371 mph |
Worked example: 100 km/h × 0.621371 = 62.1371 mph, shown as 62.14 mph. The same speed is 100 ÷ 3.6 = 27.78 m/s.
Speed is distance per time. If your problem involves changing speed, the acceleration converter may be the better tool.