Speed Converter
Convert speed between miles per hour, kilometers per hour, knots, meters per second.
Loading calculator…
What this tool does
Convert speed between miles per hour, kilometers per hour, knots, meters per second. One knot is one international nautical mile per hour.
How to use the Speed Converter
- Enter or select value.
- Enter or select from unit.
- Enter or select to unit.
- Read the calculated result; change any measurement to compare alternatives.
Formula
result = value × from.factor / to.factor; factors: mph=0.44704; kmh=0.2777777777777778; knots=0.5144444444444445; m-s=1
- value
- Value
- from
- From unit
- to
- To unit
One knot is one international nautical mile per hour.
Worked example
For speed converter, the following measurements illustrate the exact method: Value: 1; From unit: mph; To unit: kmh.
Inputs
- Value1
- From unitMiles per hour
- To unitKilometers per hour
Result
- Converted Kilometers per hour1.61
Speed conversion factors
| Unit | Factor to common base |
|---|---|
| Miles per hour | 0.44704 |
| Kilometers per hour | 0.2777777777777778 |
| Knots | 0.5144444444444445 |
| Meters per second | 1 |
Results explained
- Converted Kilometers per hour
- Converted Kilometers per hour from the formula above. One knot is one international nautical mile per hour.
Frequently asked questions
Select the source and target units. The Swap control exchanges them, retaining the equivalent converted value.
One knot is one international nautical mile per hour. The formula and reference table list all supported definitions.
Only units of the same physical quantity are convertible. The selected group's definitions are fixed and do not depend on location.
The formulas use JavaScript double precision. Display rounding can hide trailing digits, but factors are not rounded before computation.
Yes. A zero amount converts to zero in every unit in this group.