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Ma
Speedaviationscientific

What is a mach?

Speed relative to the speed of sound — Mach 1 = 1225 km/h

Definition

Mach is the ratio of an object's speed to the local speed of sound. Mach 1 at sea level in standard conditions = 1225 km/h (340.29 m/s). Supersonic starts at Mach 1; hypersonic at Mach 5. The Concorde cruised at Mach 2.04; the X-15 reached Mach 6.7.

Common uses

  • Military and supersonic-aircraft speeds
  • Aerospace engineering
  • Hypersonic missile specifications

🌍 Real-world scale

Concorde: Mach 2.04. F-16 fighter: Mach 2. SR-71 Blackbird: Mach 3.3. Space re-entry: Mach 25+.

Convert from Mach

9 conversions
Mach to Kilometer per Hour1 Ma = 1,225.04 km/hMach to Meter per Second1 Ma = 340.29 m/sMach to Mile per Hour1 Ma = 761.207 mphMach to Knot1 Ma = 661.471 knMach to Foot per Second1 Ma = 1,116.44 ft/sMach to Centimeter per Second1 Ma = 34,029 cm/sMach to Yard per Minute1 Ma = 22,328.74 yd/minMach to Inch per Minute1 Ma = 804,468.09 in/minMach to Beaufort Scale1 Ma = 340.29 Bft

Convert to Mach

9 conversions
Kilometer per Hour to Mach1 km/h = 0.0008163 MaMeter per Second to Mach1 m/s = 0.002939 MaMile per Hour to Mach1 mph = 0.001314 MaKnot to Mach1 kn = 0.001512 MaFoot per Second to Mach1 ft/s = 0.0008957 MaCentimeter per Second to Mach1 cm/s = 2.9387e-5 MaYard per Minute to Mach1 yd/min = 4.4785e-5 MaInch per Minute to Mach1 in/min = 1.2431e-6 MaBeaufort Scale to Mach1 Bft = 0.002939 Ma

Tips

  • Mach 1 = ~1225 km/h at sea level, standard conditions.
  • Local speed of sound decreases with altitude (colder air) — true Mach value varies.
  • Mach 0.8+ is "transonic"; Mach 1+ supersonic; Mach 5+ hypersonic.

Common mistakes

  • Assuming Mach 1 is a fixed speed — depends on altitude and temperature.
  • Multiplying Mach values as simple ratios across altitudes.
  • Using Mach for subsonic everyday speeds — not practical.

FAQ about the mach

What is a mach?
Mach is the ratio of an object's speed to the local speed of sound. Mach 1 at sea level in standard conditions = 1225 km/h (340.29 m/s). Supersonic starts at Mach 1; hypersonic at Mach 5. The Concorde cruised at Mach 2.04; the X-15 reached Mach 6.7.
Where is the mach used?
The mach is commonly used for: Military and supersonic-aircraft speeds; Aerospace engineering; Hypersonic missile specifications.
What is an example of a mach in real life?
Concorde: Mach 2.04. F-16 fighter: Mach 2. SR-71 Blackbird: Mach 3.3. Space re-entry: Mach 25+.
What category does the mach belong to?
The mach is a unit of speed, part of the 10-unit speed category on UnitConv.
How accurate are mach conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 speed units and their conversions.🚀 Speed hub →