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Geotechnical Toolbox

Soil Mechanics & Lab Tests

Particle Size Distribution (PSD) Plotter

Interactive grain size analysis tool supporting standard ASTM sieves, manual entry, CSV upload, envelope ranges, D10/D30/D60/D90 calculation, Cu, Cc, and soil fraction percentages.

ASTM D422ASTM D6913

Inputs

Sieve Analysis & Percent Passing Inputs

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Sieve DesignationOpening Diameter (mm)Sample A (% Passing)

Results

Enter sieve analysis opening diameters and percent passing values above, or click Load Demo Sieve Curve at the top to plot the PSD curve.

Theory and formulae

Gradation & PSD Equations

About this calculator

This free gradation plotter 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 D422, ASTM D6913.

Topics: sieve analysis, psd, grain size, gradation curve, cu, cc, d10, d60, envelope.

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