Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Water column

Height of the water column above the point in meters.

Unit weight

Unit weight of water in kN per cubic meter.

Compute hydrostatic pore water pressure in kilopascals as unit weight of water times the height of the water column above the point. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

u

Hydrostatic pore water pressure in kilopascals.

• Geological models are scale-, site-, method-, and calibration-dependent. Heterogeneity, anisotropy, sampling, diagenesis, pressure-temperature history, instrument response, boundary conditions, and empirical-correlation range can dominate the result.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Effective Stress Calculator

  Compute Terzaghi effective stress as the total vertical stress minus the pore water pressure, both in kPa.

• Hydrostatic Pressure Gradient Brine Calculator

  Compute the hydrostatic pressure gradient of a brine column from its density and local gravity.

• Mud Weight Required Calculator

  Determine the mud density needed to balance a known pore pressure at depth, including an optional trip margin.