Miles per Hour to Speed of Sound Converter

Convert MPH to Mach Number (Speed of Sound)

0.651662 Mach
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Understanding Speed of Sound

The speed of sound, also known as Mach 1, is approximately 767 miles per hour at sea level and 68°F (20°C). This speed varies with altitude and temperature. When an object travels faster than the speed of sound, it creates a sonic boom.

Common Speed References

  • Subsonic: Below Mach 1 (slower than sound)
  • Transonic: Around Mach 1 (speed of sound)
  • Supersonic: Mach 1-5 (faster than sound)
  • Hypersonic: Above Mach 5 (five times the speed of sound)

Formula

Mach Number = Miles per Hour × 0.001303