Fish Biodiversity Index Calculator

Calculate Shannon-Wiener diversity (H'), Simpson's index, Pielou's evenness, and Margalef's richness from species abundance data.

Species 1 count

Species 2 count

Species 3 count

Species 4 count

Species 5 count

Species 6 count

Species 7 count

Species 8 count

Tab to move between fields

Shannon-Wiener H'

1.72

Simpson's diversity (1-D)0.78

Simpson's D (dominance)0.22

Pielou's evenness (J')0.83

Species richness (S)8

Total individuals (N)130

Margalef's index1.44

How to Use This Calculator

Enter the number of species observed in the survey transect or station.
Input the abundance (individual count) for each species.
Review the Shannon diversity index (H'), Simpson's index (D), and species evenness (J').
Compare indices across sites or time periods to assess biodiversity change.
A Shannon H' above 3 indicates high diversity; below 1.5 indicates low diversity or dominance.

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