Foot per Second to Mach Converter
Enter a value to instantly convert between speed units.
1 Foot per Second = 0.0009 Mach (at sea level)
Key Formulas
Kilometer per Hour → Mile per Hour
mph = km/h × 0.621371Mile per Hour → Kilometer per Hour
km/h = mph × 1.60934Knot → Mile per Hour
mph = kn × 1.15078Mile per Hour → Knot
kn = mph × 0.868976Formula
Ma = ft/s × 8.957066e-4Aeronautical engineers often measure speeds in feet per second and need to express them as Mach numbers for shock wave analysis and compressibility effects. At sea level standard conditions, 1116.45 ft/s = Mach 1 (speed of sound). This conversion bridges US customary engineering units with the dimensionless Mach scale used universally in aerospace.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A subsonic test aircraft at 500 ft/s = Mach 0.448 — slow transonic research flight.
500 ft/s = 0.448 Ma
Aircraft approaching sound barrier at 1116 ft/s ≈ Mach 1 — transonic effects dominate.
1116 ft/s = 0.9997 Ma
Supersonic flight at 2232 ft/s ≈ Mach 2 — shock waves fully developed.
2232 ft/s = 1.999 Ma
Hypersonic re-entry vehicle at 5580 ft/s = Mach 5 — extreme heating and aerodynamic effects.
5580 ft/s = 5.002 Ma