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.

Indicated altitude (ft)

Indicated altitude where the correction applies.

OAT (°C)

Outside air temperature in degrees Celsius.

Estimate the altitude correction for cold temperatures against the ISA atmosphere. 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]

Temperature correction (ft)

Altitude to add for true altitude; negative when colder than ISA.

• 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.

• Corrected Altitude Calculator

  Compute what an altimeter would indicate for a known true altitude under non-standard temperature — the inverse of the cold-weather altitude correction.

• Density Altitude ISA Correction Calculator

  Estimate density altitude from pressure altitude and outside air temperature using the ISA lapse rate.

• Altimeter Correction Calculator

  Compute the cold-weather altimeter correction so the altimeter reads true altitude in colder-than-standard air.