Mach Speed Calculator
Speed (Mach)
Altitude (m)
Mach number is the ratio of object speed to the local speed of sound. At sea level (15°C), Mach 1 ≈ 340 m/s (1,225 km/h). The speed of sound decreases with altitude and temperature.
- 1Speed of sound in air = 331.3 × √(1 + T°C/273.15) m/s
- 2Speed = Mach × Speed of sound
- 3Subsonic: < Mach 1; Supersonic: > Mach 1; Hypersonic: > Mach 5
- 4At 11,000m altitude: sound speed ≈ 295 m/s
Mach 2 at sea level (15°C)=Speed = 2 × 340 = 680 m/s = 2,448 km/h
| Object | Mach number | km/h |
|---|---|---|
| Concorde (cruise) | Mach 2.0 | ~2,179 |
| SR-71 Blackbird | Mach 3.3 | ~3,540 |
| X-15 rocket plane | Mach 6.7 | ~7,274 |
| Space Shuttle reentry | Mach ~25 | ~30,000 |
References
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