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.

Porosity

Porosity as a fraction between 0 and 1.

Convert porosity n to the void ratio using e = n / (1 - n). 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]

Void ratio

Void ratio (dimensionless).

• 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 Void Ratio Calculator

  Convert void ratio e to porosity using n = e / (1 + e).

• Saturated Density Calculator

  Compute the saturated bulk density from specific gravity and void ratio using rho_sat = (Gs + e) / (1 + e) * rho_w.

• Secondary Compression Settlement Calculator

  Secondary (creep) settlement Ss = H * C_alpha / (1 + e_p) * log10(t2 / t1), where C_alpha is the secondary compression index from the e - log10 t tail of an oedometer test, e_p the void ratio at end of primary consolidation, and t1, t2 the creep time window in years.