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Hydrostatic Pressure Calculator

Petrosmart Academy - Petroleum and Industrial Fluid Column Pressure Tool

🧪 Fluid selection

⚙️ Parameters

Fluid density

kg/m3

Column height / depth

Surface pressure (P0)

bar

Gravitational acceleration

m/s2

Pipe / casing inner diameter

Pressure profile visualization

📐 Multi-layer fluid column (up to 5 layers)

Enter each fluid layer from top to bottom. Common in wellbore annuli, storage tanks and pipelines with stratified fluids.

Surface pressure (P0)

bar

🛢️ Wellbore pressure analysis - Petroleum engineering

Calculates bottom-hole pressure (BHP), formation pressure gradient, overbalance/underbalance, equivalent circulating density (ECD) and kill mud weight. Standard petroleum engineering calculations per API RP 13D.

Well total depth (TVD)

Drilling mud density

kg/m3

Surface casing pressure

bar

Formation pressure (known/estimated)

bar

Annular pressure loss (APL)

bar

Fracture gradient

bar/m

Pore pressure gradient (known)

bar/m

Casing shoe depth (TVD)

🔄 Pressure unit converter

Input pressure value

Input unit

🔄 Density / pressure gradient converter

Mud density

kg/m3

Depth

Fluid type

📚 Petroleum and industrial fluid reference - Click to load

Fluid	Density (kg/m3)	SG	Gradient (bar/m)	Gradient (psi/ft)	At 1000m (bar)

📖 Key formulas reference

Hydrostatic pressure: P = P0 + rho x g x h (Pa)
In bar: P (bar) = P0 + rho (kg/m3) x 9.81 x h (m) / 100000
In psi: P (psi) = P0 + 0.4335 x SG x h (ft)
Pressure gradient: G (bar/m) = rho x 9.81 / 100000
Pressure gradient: G (psi/ft) = SG x 0.4335
ECD: ECD (kg/m3) = mud_density + APL x 100000 / (9.81 x TVD)
Kill mud weight: KMW = mud_rho + (SIDPP x 100000) / (9.81 x TVD)
Overbalance: OB = BHP - Pformation
Underbalance: UB = Pformation - BHP (kick conditions)
Fracture pressure: Pfrac = fracture_gradient (bar/m) x TVD
EMW: EMW (kg/m3) = P (bar) x 100000 / (9.81 x TVD)

🎓 Pressure conversion table

From	To bar	To psi	To kPa	To atm
1 bar	1.000	14.504	100.0	0.9869
1 psi	0.06895	1.000	6.895	0.06805
1 kPa	0.01000	0.1450	1.000	0.009869
1 MPa	10.000	145.04	1000.0	9.8692
1 atm	1.01325	14.696	101.325	1.000
1 kgf/cm2	0.98067	14.223	98.067	0.96784
1 m H2O	0.09807	1.4223	9.807	0.09678

petrosmartacademy.com · Hydrostatic pressure calculations per API RP 13D / ISO 10416 · Educational tool only