Plasticity Chart (Atterberg Limits) Calculator

Plot and classify fine-grained soils on Casagrande's plasticity chart using liquid limit (LL) and plasticity index (PI) to distinguish silts from clays per USCS and ASTM D2487.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
Advertisement

How It Works

Plot and classify fine-grained soils on Casagrande's plasticity chart using liquid limit (LL) and plasticity index (PI) to distinguish silts from clays per USCS and ASTM D2487

Each component has a specific meaning:

  • Liquid limit — The liquid limit recorded for the patient or scenario being assessed.
  • Plasticity index — The plasticity index recorded for the patient or scenario being assessed.

Note: Interpret the plasticity chart result against the clinical thresholds and context described above.

How to Use

Enter the liquid limit, plasticity index for the patient or scenario you are assessing. Plot and classify fine-grained soils on Casagrande's plasticity chart using liquid limit (LL) and plasticity index (PI) to distinguish silts from clays per USCS and ASTM D2487. Use the plasticity chart result to inform your clinical assessment.

Frequently Asked Questions