Atmospheric Parameters
Enter elevation, QNH, and actual temperature to calculate ISA values
ft
hPa
°C
Method: Pressure altitude uses the ISA barometric formula. Density altitude uses the common linear approximation DA = PA + 118.8 × (OAT − ISA temp), with the ISA temperature taken at the pressure altitude, so it is an estimate rather than an exact density calculation. QNH format is auto-detected (values between 25-35 are treated as inHg, otherwise as hPa).