Altimetry

Pression altitude calculator:

QNH altitude	QNH	Pression alt.
FT		0 FT*

*0 + (1013 - 1013) x 27

Pressure altitude is the height above a theoretical level where the weight of the atmosphere is 1013.2 hPa as measured by a barometer in the International Standard Atmosphere (ISA).

Density altitude calculator:

Pression alt.	STD temperature	Actual temperature	Density alt.
FT	15 °C	°C	0 FT**

**0 + 120 x (15 - (15))

Density altitude is pressure altitude adjusted for a non-standard temperature.

Decision altitude (altimeter temperature error correction):

Decision alt.	RWY alt.	Actual temperature	Indicated alt.
FT	FT	°C	200 FT

Decision altitude is a specified altitude at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

J Charles Aviation

Altimetry

Pression altitude calculator:

Density altitude calculator:

Decision altitude (altimeter temperature error correction):

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