Convert velocity between metric, imperial, nautical, and scientific units.
Result
1 km/h = 0.6213711922 mph
1 km/h in every supported unit.
| Unit | Value |
|---|---|
| Metre per secondm/s | 0.2777777778 |
| Kilometre per hourkm/h | 1 |
| Mile per hourmph | 0.6213711922 |
| Knotkn | 0.5399568035 |
| Foot per secondft/s | 0.9113444153 |
Complete tool guide
The Speed Converter is a free online conversion tool for translating a speed value from one measurement unit into another. Convert velocity between metric, imperial, nautical, and scientific units. Enter a number once to see the selected result and a comparison table covering every supported unit.
Unit conversion is useful whenever a specification, recipe, report, product label, instrument, dataset, or instruction uses a measurement system different from the one you need. The converter applies the defined mathematical relationship consistently and avoids the common mistakes caused by moving decimal points or relying on a remembered approximate factor.
Enter the source number exactly as supplied, including any required decimal precision.
Choose the original unit in the From field and verify its symbol; similarly named units can represent different quantities.
Choose the required destination unit in the To field and read the live result. Use Swap when you need the reverse relationship.
Review the all-conversions table, then copy the labeled result and retain the source value for traceability.
Speeds are normalized through metres per second. For example, 1 km/h equals 1/3.6 m/s, 1 mph equals 0.44704 m/s, and 1 knot equals one nautical mile per hour.
Speed values are normalized through metres per second.
This converter supports Metre per second (m/s), Kilometre per hour (km/h), Mile per hour (mph), Knot (kn), Foot per second (ft/s).
The result describes the same rate of travel in another distance-per-time unit.
Speed is magnitude only, while velocity also includes direction. Average trip speed is not necessarily the same as instantaneous speed.
Displayed values are rounded for readability. A converted number cannot be more accurate than the source measurement, so do not treat extra decimal places as additional instrument precision.
Convert velocity between metric, imperial, nautical, and scientific units. Supported choices are Metre per second (m/s), Kilometre per hour (km/h), Mile per hour (mph), Knot (kn), Foot per second (ft/s). Select the unit attached to the source value and the unit required for the result.
The calculator uses the factors and formulas described above and retains precision internally. The practical accuracy still depends on the source measurement, correct unit selection, displayed rounding, and whether the context uses the same unit definition.
Check for a rounded factor, a different regional unit, an incorrect source unit, or a distinction such as decimal versus binary, US versus imperial, gauge versus absolute, or mass versus volume. Compare the complete unit name and method.
Only some metric-prefix conversions work that way. Imperial relationships, offset temperature scales, reciprocal fuel economy, area, volume, and many cross-system conversions require specific formulas. Use the defined converter rather than assuming a power of ten.
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