Earthworm Count Calculator

Estimate earthworm population density per acre from field sample counts with moisture corrections.

Worms found per sample

Sample area (ft²)

Number of samples taken

Soil moisture condition

Tab to move between fields

Worms per ft²

Worms per acre522,720

Worm biomass (lb/ac)1,152.6

Soil processed (tons/ac/yr)24

Health score (0-100)50

Biomass G Per (m²)129.17

RatingModerate

Sampling CVModerate

How to Use This Calculator

Dig a 12-inch cube of soil and count all earthworms found.
Enter your earthworm count and the soil moisture percentage at sampling.
Input the soil temperature at the time of sampling.
Review the Earthworms per Cubic Foot and the Soil Health Rating.
Use the Recommended Count Threshold to determine if biological activity is adequate for your crop system.

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