Speed Converter
Speed measures how fast distance is covered over time. Road speeds use miles per hour or kilometers per hour, physics uses meters per second, and marine and aviation use knots. The SI base is the meter per second.
1 mph = 1.609344 km/h
About speed conversion
Speed conversion is commonly needed when driving, running, cycling, aviation, and weather reports.
Popular conversions
All speed units
| Unit | Symbol | System |
|---|---|---|
| Meter per Second | m/s | SI |
| Kilometer per Hour | km/h | Metric |
| Mile per Hour | mph | Imperial |
| Foot per Second | ft/s | Imperial |
| Knot | kn | Other |
Frequently asked questions
What is the base unit for speed?
Speed conversions on this site are calculated against the meter per second (m/s).
Which speed units can I convert?
You can convert between 5 units, including meter per second, kilometer per hour, mile per hour, foot per second, and more.
Where is speed conversion useful?
It is commonly needed when driving, running, cycling, aviation, and weather reports.
Does this converter mix measurement systems?
The converter supports SI, Metric, Imperial, Other units and keeps their exact definitions separate so results stay accurate.