NWS Formula

The National Weather Service (NWS) provides the formula for calculating airport density altitude.

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The Math

Given

 

- Airport barometer setting Pa (inHg)

- Airport altitude h(meters)

- Dew point temperature Td (Celcius)

- Outside air temperature T (Kelvin)

  1. Determine station pressure Pstn

  2. Determine vapor pressure e

  3. Determine virtual temperature T(Kelvin)

  4. Convert virtual temperature Kelvin to Rankine Tr

  5. Solve for density altitude hdensity  in feet

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© 2019  J. Hobbs

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