Speed Converter

Convert between different units of speed including mph, km/h, m/s, knots, and feet per second with precision.

Popular Conversions

Speed Units

Meters per second (m/s)
SI base unit of speed, used in scientific applications
Kilometers per hour (km/h)
Common metric unit for road speed limits and vehicle speeds
Miles per hour (mph)
Imperial unit commonly used in US for road speeds
Knots (kn)
Nautical unit, 1 knot = 1.852 km/h, used in aviation and maritime
Feet per second (ft/s)
Imperial unit for measuring projectile or bullet speeds
Mach
Speed relative to sound, Mach 1 = 343 m/s at sea level

Conversion Tips

  • 1 km/h = 0.277778 m/s = 0.621371 mph
  • 1 mph = 1.60934 km/h = 0.44704 m/s
  • 1 knot = 1.852 km/h = 0.514444 m/s
  • Speed of sound (Mach 1) ≈ 343 m/s at sea level