- TAS Calculations -

Start with calculating your True Air Speed (TAS) from Indicated Air Speed (IAS), your Altitude, local QNH and OAT.

True Air Speed
IAS	Kts
Altitude (MSL)	Feet
QNH	inHg  hPa
Temp (OAT)	°F  °C
True Air Speed	Kts

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Below an air speed indicator capable of showing IAS and TAS.

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