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.

Bulk volume

Bulk volume of the plug in cubic centimetres.

Grain volume

Helium grain volume of the plug in cubic centimetres.

Compute helium-pycnometry porosity from bulk volume and helium-measured grain volume, both in cubic centimetres. 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]

Pore volume

Pore volume in cubic centimetres.

Porosity

Porosity as a volume fraction.

• 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.

• Bulk Density From Porosity Calculator

  Compute dry bulk density as the product of grain density and (1 - porosity).

• Decompacted Thickness Calculator

  Grain-volume-conserving decompaction of a compacted unit: t' = t * (1 - porosity) / (1 - target porosity). Porosities are fractions.

• Porosity From Bulk Density Calculator

  Compute porosity as n = 1 - (bulk density / grain density) for a rock or soil sample.