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LithoLab/ Tools/ Grain Size Classifier

Grain Size Classifier

Classify sediment grain size using the Wentworth Scale. Enter a grain diameter in millimetres, micrometres, or phi (Ξ¦) units to identify sediment class, depositional environment, and phi equivalent. Based on the Udden-Wentworth grain size classification system widely used in sedimentology and stratigraphy.

Wentworth Scale Sedimentology mm Β· ΞΌm Β· Ξ¦ Input Depositional Environment Free Β· Browser-Based

Input Parameters

Enter a positive value in your chosen unit below.
Quick Examples

Classification Result

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Enter a grain diameter above and click Classify Grain to see the result.

Wentworth Scale Reference

Class Size (mm) Phi (Ξ¦) Typical Depositional Setting