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.

Mach number

Flight Mach number.

OAT (°C)

Outside air temperature in degrees Celsius.

Convert a Mach number and outside air temperature to true airspeed via the local speed of sound. 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]

TAS (kt)

True airspeed through the airmass.

• 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.

• Speed of Sound Calculator

  Compute the local speed of sound from the outside air temperature.

• Mach Number Calculator

  Compute the Mach number from true airspeed and temperature.