MTMasterTool

Density Altitude Calculator

Estimate density altitude from pilot-entered data.

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What this tool does

Estimate density altitude from pilot-entered data. Troposphere ideal-gas estimate including dew-point humidity. Not an approved aircraft-performance computation.

How to use the Density Altitude Calculator

  1. Enter or select field elevation (ft).
  2. Enter or select altimeter setting (inhg).
  3. Enter or select air temperature (°c).
  4. Enter or select dew point (°c).
  5. Read the calculated result; change any measurement to compare alternatives.

Formula

pressure altitude≈elevation+(29.92−altimeter)×1000; vapor pressure=6.1078×10^(7.5×dew/(237.3+dew)); moist density=(pressure−vapor)/(Rd×T)+vapor/(Rv×T); density altitude from ISA density inversion
elevation
Field elevation (ft)
altimeter
Altimeter setting (inHg)
temp
Air temperature (°C)
dew
Dew point (°C)

Troposphere ideal-gas estimate including dew-point humidity. Not an approved aircraft-performance computation.

Worked example

For density altitude calculator, the following measurements illustrate the exact method: Field elevation (ft): 5000; Altimeter setting (inHg): 29.92; Air temperature (°C): 30; Dew point (°C): 10.

Inputs

  • Field elevation (ft)5000
  • Altimeter setting (inHg)29.92
  • Air temperature (°C)30
  • Dew point (°C)10

Result

  • Estimated density altitude (ft)7,979.15
  • Estimated pressure altitude (ft)5,000

Results explained

Estimated density altitude (ft)
Estimated density altitude (ft) from the formula above. Troposphere ideal-gas estimate including dew-point humidity. Not an approved aircraft-performance computation.
Estimated pressure altitude (ft)
Estimated pressure altitude (ft) from the formula above. Troposphere ideal-gas estimate including dew-point humidity. Not an approved aircraft-performance computation.

Frequently asked questions

pressure altitude≈elevation+(29.92−altimeter)×1000; vapor pressure=6.1078×10^(7.5×dew/(237.3+dew)); moist density=(pressure−vapor)/(Rd×T)+vapor/(Rv×T); density altitude from ISA density inversion

Troposphere ideal-gas estimate including dew-point humidity. Not an approved aircraft-performance computation.

No. Verify every result against the aircraft's official Pilot's Operating Handbook, current weather and official flight-planning information before flight.

Use current aircraft-specific records, approved POH data and official weather. Generic defaults are not approved aircraft limits.

No. You must supply current verified conditions; calculations are entirely local.