Meter per Second (m/s)

The SI base unit of speed

The Meter per Second (m/s) is a unit of speed that emerged from the practical needs of transportation, navigation, or scientific measurement. Speed measurement became increasingly important as the Industrial Revolution enabled faster travel by rail and steam, and later by automobiles and aircraft. Today, different speed units persist in different industries and countries: miles per hour for road travel in the US and UK, km/h in most of the world, knots in aviation and maritime contexts, and m/s in scientific applications.

Accurate speed measurement is critical in engineering, science, commerce, and everyday life. Using the correct unit and applying conversions precisely prevents errors that can be costly or dangerous in professional applications.

Conversion Table

UnitSymbol1 m/s =
Kilometer per Hourkm/h3.6 km/h
Mile per Hourmph2.23694 mph
Knotkn1.94385 kn
MachMa0.00291545 Ma

Conversions Involving Meter per Second

Meter per Second → Kilometer per Hour

m/s → km/h

Meter per Second → Mile per Hour

m/s → mph

Meter per Second → Knot

m/s → kn

Meter per Second → Mach

m/s → Ma

Kilometer per Hour → Meter per Second

km/h → m/s

Mile per Hour → Meter per Second

mph → m/s

Knot → Meter per Second

kn → m/s

Mach → Meter per Second

Ma → m/s

Common Uses of the Meter per Second

  • •Automotive — reading speedometers and interpreting speed limits
  • •Aviation — communicating airspeed, cruise speed, and wind speed
  • •Maritime navigation — measuring vessel speed and current velocity
  • •Meteorology — reporting wind speed in weather forecasts
  • •Physics and engineering — describing velocity in dynamics problems

Did You Know?

The fastest human-made objects are NASA's Parker Solar Probe, which reached speeds exceeding 635,000 km/h (395,000 mph) as it orbited close to the Sun. In contrast, the average walking speed is about 5 km/h. The Meter per Second is one of many units used to express the enormous range of speeds observed in nature and engineering.