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Atterberg Limits

Liquid limit, plastic limit & plasticity index per ASTM D4318

Test Level
Classification critical
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STEP 1/3
Atterberg Limits Test
Determine liquid limit, plastic limit, and plasticity index
⚖ Test Inputs
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tests
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Enter Limits Data
Input liquid and plastic limits to calculate plasticity index and classify soil.
📝 ASTM D4318 Method
  • Liquid Limit: Moisture content where soil flows 13mm in 25 blows
  • Plastic Limit: Lowest moisture where soil can be rolled without cracking
  • Plasticity Index = LL - PL
  • LL range controls volumetric changes in fine-grained soils
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