🚀 Speed Converter

Speed Unit Converter
( m/s, km/h, mph, knots, Mach )

Convert between meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach number. Enter any value, get instant results.

Converter Tool
m/s
mph
From
    To
      Result
      1 m/s = 2.23694 mph
      2.23694
      mph
      The Formula
      mph = m/s × 2.23694
      1 m/s = 1 m/s, 1 mph = 0.44704 m/s
      1 m/s= 3.6 km/h
      1 mph= 1.609 km/h
      1 knot= 1.852 km/h
      Mach 1≈ 340 m/s
      Unit Reference Table

      All speed units relative to 1 meter per second (m/s).

      Unit NameSymbolValue in m/sCommon Usage

      Understanding Speed Measurement Units

      Speed measures distance traveled per unit of time. The SI unit is meters per second (m/s), but many other units are used in daily life, science, and navigation.

      Common Units

      Kilometers per hour (km/h) are used for road speeds in most countries. Miles per hour (mph) are used in the US and UK. Knots (kn) are used in aviation and maritime – 1 knot = 1 nautical mile per hour = 1.852 km/h. Feet per second (ft/s) is used in some engineering contexts.

      Mach Number

      Mach (M) is a dimensionless unit expressing speed relative to the speed of sound in the local medium. At sea level, Mach 1 ≈ 340.29 m/s, 1225 km/h, or 761 mph. Mach number varies with altitude and temperature.

      • Subsonic: below Mach 0.8
      • Transonic: Mach 0.8–1.2
      • Supersonic: Mach 1.2–5.0
      • Hypersonic: above Mach 5.0
      Frequently Asked Questions
      How do you convert m/s to km/h? +
      Multiply by 3.6. For example, 10 m/s × 3.6 = 36 km/h.
      How many miles per hour is Mach 1? +
      Mach 1 ≈ 761 mph at sea level.
      What is 1 knot in mph? +
      1 knot = 1.15078 miles per hour.
      How many feet per second in 1 m/s? +
      1 m/s ≈ 3.28084 feet per second.
      What is the speed of sound in Mach? +
      By definition, Mach 1 is the speed of sound in the given medium. At sea level, it’s about 340 m/s.
      Why does Mach number change with altitude? +
      The speed of sound depends on air temperature, which decreases with altitude up to the tropopause. So the same Mach number corresponds to a lower actual speed at higher altitude.
      All Speed Conversion Pages

      Browse all 28 dedicated conversion pages, organized by unit.

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