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.

OAT (°C)

Outside air temperature.

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

Speed of sound (kt)

Local speed of sound.

• 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.

• TAS from Mach Temperature Calculator

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

• Groundspeed From Mach Calculator

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

• Density Altitude Calculator

  Compute density altitude from pressure altitude and outside air temperature.