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Speed Converter

Conversion Results

International System of Units (SI)

Meter per second (m/s)-
Kilometer per hour (km/h)-
Kilometer per second (km/s)-

Imperial units

Miles per hour (mph)-
Feet per second (ft/s)-
Inches per second (in/s)-

Nautical & special units

Knot (kn)-
Mach (Ma)-
Speed of light (c)-

About the Speed Converter

Supported unit systems:

  • SI: m/s, km/h, km/s
  • Imperial: mph, ft/s, in/s
  • Nautical/aerospace: kn, Ma
  • Special: c

Key conversions:

  • 1 km/h = 0.27778 m/s
  • 1 km/s = 1000 m/s
  • 1 mph = 0.44704 m/s
  • 1 kn = 0.51444 m/s
  • 1 Ma ≈ 343 m/s (sea level, standard atmosphere)
  • 1 c = 299,792,458 m/s (vacuum)

Note: Mach number depends on the local speed of sound, which varies with temperature and altitude.