Soil Mechanics & Lab Tests

Soil Phase Relationships & Weight-Volume Calculator

Solve all fundamental soil phase and index properties (w, e, n, Sr, Gs, γ, γd, γsat, γ') with bidirectional solver and interactive 3-phase soil block diagram.

ASTM D854ASTM D2216ASTM D7263

Inputs

Demo

Enter Known Soil Parameters

Enter any 3 to 4 independent properties. The engine automatically solves all remaining relationships.

Moisture Content, w (%)

Specific Gravity, Gs

Void Ratio, e

Degree of Saturation, Sr (%)

Porosity, n (%)

Bulk Unit Wt, γ (kN/m³)

Dry Unit Wt, γd (kN/m³)

Saturated Unit Wt, γsat (kN/m³)

Results

Please specify at least 3 independent soil properties to solve the phase system.

Theory and formulae

Fundamental Soil Phase Equations

About this calculator

This free soil phase relations calculator runs entirely in your browser: what you enter is never uploaded. Use the calculation steps and the theory section to check the working, and print a calculation sheet with the inputs, results and formulae for your records.

Methods and references: ASTM D854, ASTM D2216, ASTM D7263.

Topics: phase relationships, weight-volume, void ratio, porosity, saturation, specific gravity, moisture content, dry density, unit weight, 3-phase diagram.

Engineering notice: Results are for preliminary estimation, screening and education. All inputs and outputs must be independently verified by a qualified professional engineer before use in any design or construction decision. Read the full disclaimer