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.

Grain density

Grain (solid particle) density in kg/m3.

Porosity

Porosity as a fraction between 0 and 1.

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

Bulk density

Dry bulk density in kg/m3.

• Geotechnical correlations and idealized failure models depend on stratigraphy, sampling disturbance, drainage, stress history, groundwater, density, anisotropy, scale, construction sequence, and laboratory or field method. Site-specific design requires investigation and code factors.
• 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.

• Porosity From Bulk Density Calculator

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

• Core Porosity Helium Calculator

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

• Dry Density Calculator

  Compute dry density from wet (bulk) density and gravimetric water content using rho_d = rho / (1 + w).