Speed Converter

Convert between mph, km/h, m/s, knots, and other speed units

Common Speed Conversions

Kilometers/hour to Miles/hour
1 km/h = 0.62 mph
Miles/hour to Kilometers/hour
1 mph = 1.61 km/h
Meter/second to Kilometers/hour
1 m/s = 3.6 km/h
Knot to Kilometers/hour
1 knot = 1.85 km/h
Feet/second to Miles/hour
1 ft/s = 0.68 mph
Speed of Sound
Mach 1 = 1235 km/h

Speed in Real Life

Walking Speed

≈ 5 km/h (3.1 mph, 1.4 m/s)

Highway Speed

≈ 120 km/h (75 mph, 33 m/s)

Commercial Jet

≈ 900 km/h (560 mph, 250 m/s)

Cheetah

≈ 110 km/h (68 mph, 31 m/s)

About Speed Measurement

Speed is the rate of change of distance with respect to time. It's a scalar quantity measured in units of distance per time, such as meters per second (m/s) in the SI system. Speed conversions are essential in transportation, physics, sports, and engineering applications.

Common Applications

  • • Vehicle speed monitoring and limits
  • • Aviation and maritime navigation
  • • Sports performance analysis
  • • Physics and engineering calculations
  • • Weather and wind speed reporting
  • • Manufacturing and production rates

Speed vs Velocity

  • • Speed: magnitude only (scalar)
  • • Velocity: magnitude + direction (vector)
  • • Average speed: total distance ÷ time
  • • Instantaneous speed: speed at a moment
  • • Relative speed: speed relative to observer

Speed Limits & Records

The speed of light in vacuum is approximately 299,792,458 m/s (about 1.08 billion km/h), which is the ultimate speed limit in the universe. Sound travels at about 343 m/s (1,235 km/h) in air at room temperature. Understanding these reference speeds helps put everyday speeds in perspective.

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