Atmospheric Pressure Calculator
Calculates atmospheric pressure using the ICAO International Standard Atmosphere (ISA) barometric formula. Essential for gauge-to-absolute conversions in flow measurement and equipment sizing per AGA and API standards.
Calculation Mode:
Input
ft
Valid range: -1,000 to 36,089 ft (troposphere)
Input
psia
Valid range: 3.28 to 15.5 psia
📚 Learn the Theory
Barometric pressure, altitude corrections, and standard conditions