Water Stable Aggregate Calculator

Calculate water-stable aggregate percentage from wet-sieving test results to assess soil structural health and erosion resistance.

Initial sample weight (g)

Stable aggregate weight (g)

Sand/gravel weight (g)

Soil organic matter (%)

Tab to move between fields

Water-stable aggregates (%)

51.1%

Stability score (0-100)75

Est. mean weight diameter (mm)1.32

Est. infiltration rate (in/hr)3.1

vs. Expected (%)17.1

RatingStable

Erosion RiskModerate

Crust RiskLow

How to Use This Calculator

Collect a representative 100g soil sample and enter the percentage of aggregates that remain stable after wet sieving.
Input your soil texture class and organic matter percentage.
Set the tillage intensity to contextualize the aggregate stability result.
Review the Mean Weight Diameter and the Aggregate Stability Score.
Use the Erosion Risk Rating to decide whether cover crops or reduced tillage are needed.

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