Use this calculator for flight-planning study or a first-pass cross-check when all inputs describe the same aircraft, atmospheric condition, and phase of flight.

Stalling speed (kt)

Stalling speed in the current configuration.

Estimate the rough-air penetration speed as 1.9 times the stalling speed. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Penetration speed (kt)

Estimated penetration speed for turbulent air, below the maneuvering envelope.

• Do not use a generic calculator in place of the current aircraft flight manual, approved performance data, operating limitations, NOTAMs, weather, or regulations. Real performance changes with configuration, runway condition, altitude, temperature, wind, loading, and technique.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check the result against the aircraft flight manual or approved planning system, then apply the required safety margins. Keep signed wind, heading, altitude, speed, and fuel conventions explicit.

• Groundspeed From Mach Calculator

  Compute true ground speed from Mach number and outside air temperature.

• Max Range Airspeed Calculator

  Estimate the best glide airspeed for maximum range as the square root of three times the minimum-sink speed.

• Range Calculator

  Compute the still-air distance reachable from usable fuel, flow rate, and ground speed.