Use this aerodynamics calculator to calculate the hydrostatic equation for your aerodynamics problems.
Formula:
dp = -ρ g d hg
where,ρ - Air density (kg/m3),
g - Gravitational acceleration at a certain altitude (g = 9.81m/s2) (m/s2),
hg - Height above the ground (Geometric height) (m)
dp - hydrostatic equation