Popular conversions
2 pairsKilometer per Hour ↔ Meter per Second
km/h ↔ m/s
Mile per Hour ↔ Kilometer per Hour
mph ↔ km/h
Unit guides
3 unitsDetailed guide to Speed
Speed describes how fast a distance is covered over time.
Different industries and countries use different units, so reliable conversion is important for traffic, testing, fluid flow and machinery.
- Physical quantity
- Speed
- Common SI-based unit
- Meter per second
- Road unit
- Kilometer per hour
- Imperial unit
- Mile per hour
- Typical use
- Transport, flow and equipment motion
What is speed?
Speed is the ratio of distance traveled to elapsed time.
It is used for vehicles, conveyors, fluids, rotating systems and motion analysis.
Meters per second, kilometers per hour and mph
Meters per second are common in physics and engineering. Kilometers per hour are common in road transport, while mph is still used in countries that rely on imperial road units.
All three units can be converted exactly through their definitions in meters and seconds.
How are speed units converted?
Speed conversions preserve the same physical motion while changing the numerical representation.
For example, 1 km/h equals about 0.27778 m/s, and 1 mph equals 1.609344 km/h.
Speed units
| Unit | Symbol | Information |
|---|---|---|
| Meter per Second | m/s | View unit guide |
| Kilometer per Hour | km/h | View unit guide |
| Mile per Hour | mph | View unit guide |
Sources
The definitions and conversion relationships on this page are aligned with standard metrology and SI reference material.