Hydrostatic Pressure Calculator

Hydrostatic Pressure Calculator converts fluid density to pressure gradient and hydrostatic pressure at true vertical depth, accepting mud weight in whichever unit your fluid report already uses — pounds per gallon, pounds per cubic foot, specific gravity, or API gravity. Run it in reverse to solve for the mud weight needed to hit a target pressure at a given depth.

How It Works

Hydrostatic pressure (psi) = fluid density (ppg) × .052 × true vertical depth (ft) — the standard field-unit gradient relation, with additional direct conversions for lb/ft³ and API Gravity inputs.

See every formula worked through in detail on the Completion Engineering Formulas reference.

When You'd Use It

Before running a job, engineers convert a mud report's fluid weight into a pressure gradient and hydrostatic pressure at depth to check it against formation pressure — or work backward from a target bottomhole pressure to the mud weight needed to hit it.

Key Features

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