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 The ISA datum is a theoretical reference level where the weight of the atmosphere is 29.92 "Hg (1013.25 mb/hPa) as measured by a barometer. This calculator computes the 1976 ISA Pressure and Temperature (above this ISA datum) from the given altitude. The formula used is as follows: where Pb = reference pressure (Pa) Tb = reference temperature (K) Lb = temperature lapse rate (K/m) in ISA h = height at which pressure is calculated (m) hb = height of reference level b (meters) R = universal gas constant: 8.3144598 J/(mol·K) g0 = gravitational acceleration: 9.80665 m/s2 M = molar mass of Earth's air: 0.0289644 kg/mol