Hydrostatic Pressure Calculator

Calculate wellbore pressure from fluid density and depth for drilling and well control operations

Pressure Parameters

Enter depth and fluid properties

Calculate pressure with multiple fluid layers (e.g., spacer + cement + mud)

Pressure Results

Enter parameters and click Calculate

Pressure Gradient Reference

Fluid Density (ppg) Gradient (psi/ft)
Fresh Water8.340.433
Sea Water8.560.445
Normal Pore Pressure9.00.465
Typical OBM12.00.624
Heavy Mud16.00.832

Formula Reference

Basic Hydrostatic Pressure

P = 0.052 x MW x TVD Where: P = Hydrostatic pressure (psi) MW = Mud weight (ppg) TVD = True Vertical Depth (ft) 0.052 = Conversion constant (psi/ft per ppg)

With SI Units

P = rho x g x h Where: P = Pressure (Pa) rho = Density (kg/m3) g = 9.81 m/s2 (gravitational acceleration) h = Height/depth (m)

Pressure Gradient

Gradient (psi/ft) = 0.052 x MW (ppg) Gradient (psi/ft) = 0.433 x SG

Multi-Fluid Column

P_total = Sum of (0.052 x MW_i x h_i) for each layer Where h_i = thickness of layer i

Equivalent Mud Weight (EMW)

EMW = P / (0.052 x TVD) Used to express any pressure as an equivalent mud weight at a given depth