Atmosphere & weather
True altitude
Correct indicated altitude for temperature error.
- True altitude
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- Temperature correction
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- ISA deviation
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The link carries your inputs, share it and the tool opens pre-filled.
How it works
Correction (ft) ≈ 4 × ISA deviation × (height above the altimeter-setting source ÷ 1,000); true altitude = indicated + correction. Warmer than ISA → you are higher than indicated; colder → lower. An approximation; for terrain-critical cold-weather operations use the AIP/ICAO tables.
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