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Aviation
Density Altitude Calculator
Enter pressure altitude and temperature to get the density altitude.
Density altitude
—
Performance altitude.
| ISA temperature | — |
|---|---|
| Temp deviation | — |
| Pressure altitude | — |
| OAT | — |
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Enter your figures above to see the step-by-step working.
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How the Density Altitude Calculator Works
Density altitude is the altitude the air “feels like” to your aircraft — pressure altitude corrected for temperature. Hot air is thin, so on a warm day the engine, wings and propeller all perform as if you were much higher. A common approximation adds about 120 feet of density altitude for every degree Celsius the temperature is above standard.
Enter the pressure altitude and outside air temperature; the calculator finds the standard (ISA) temperature for that altitude, the deviation from it, and the resulting density altitude. High density altitude means longer take-off rolls and reduced climb.
density altitude ≈ pressure altitude + 120 × (OAT − ISA temp)
Frequently Asked Questions
What is density altitude?
Pressure altitude corrected for non-standard temperature — the altitude at which the air density matches what your aircraft is actually experiencing.
Why does density altitude matter?
High density altitude thins the air, cutting engine power, lift and propeller thrust, so take-off and climb performance drop sharply.
How is it estimated?
Add roughly 120 feet per °C that the temperature is above the standard (ISA) temperature for your pressure altitude.
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