Soil Gradation Calculator: Calculate Cu & Cc for Soil Classification

The Soil Gradation Calculator is a powerful tool for determining the Coefficient of Uniformity (Cu) and Coefficient of Curvature (Cc)—two critical parameters in soil mechanics. Cu indicates the range of particle sizes in a soil sample, while Cc reflects the shape of the particle size distribution curve. Together, they help engineers classify soils as well-graded or poorly graded according to the ASTM D2487-17 Unified Soil Classification System. By inputting the percentage of soil passing through standard sieve sizes, the calculator automatically computes D10, D30, and D60, from which Cu and Cc are derived. These values are essential for evaluating soil properties such as permeability, compaction, and stability—key factors in designing foundations, pavements, and other civil structures. Whether for academic purposes, field analysis, or construction planning, this calculator ensures fast, precise, and reliable assessment of soil gradation.

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