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Aviation Calculators

Pressure Altitude Calculator

Pressure altitude from field elevation and altimeter setting, in hPa or inches of mercury.

Enter values

Results update as you type.

Result

Pressure altitude

1,723 ft

Correction applied
223 ft
Altimeter setting
1,005 hPa
In inches of mercury
29.678
Difference from standard
-8.25 hPa
Equivalent flight level
17 FL

About the Pressure Altitude Calculator

Pressure altitude from field elevation and altimeter setting, in hPa or inches of mercury.

Also known as: pa calculator, altimeter setting conversion, qnh to pressure altitude, flight level calculator.

How to use this calculator

  1. Enter field elevation, altimeter units.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

PA = field elevation + (1013.25 − QNH) × 27 ft per hPa

Worked example

Using the values pre-filled in the calculator above:

  • Field elevation = 1,500 ft
  • Altimeter units: hPa / millibars
  • Altimeter setting = 1,005 hPa

the calculator returns:

  • Pressure altitude: 1,723 ft
  • Correction applied: 223 ft
  • Altimeter setting: 1,005 hPa
  • In inches of mercury: 29.678