How does the Biodiversity Index (Shannon) work?

pᵢ = nᵢ/N for each species Then: H = −Σ(pᵢ × ln pᵢ) Then: H_max = ln(S) · Evenness J = H/H_max.

Can you give an example of how to use the Biodiversity Index (Shannon)?

Example: Input Species counts: 50, 30, 20 gives a result of H = 1.03 · J = 0.94 (High evenness despite only 3 species).

Is the Biodiversity Index (Shannon) free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Biodiversity Index (Shannon)?

Our Biodiversity Index (Shannon) uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Biodiversity Index (Shannon)

🌿Biodiversity Index (Shannon-Wiener)

Individual counts per species (comma separated)

e.g. 10, 20, 30, 5

The Shannon-Wiener diversity index H' measures biodiversity combining species richness and evenness. H' = −Σ(pᵢ × ln pᵢ).

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Did You Know?

The Amazon rainforest has Shannon indices exceeding 5 — extraordinary species richness. A monoculture farming system has H=0.

References

›Diversity index — Wikipedia

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Biodiversity Index (Shannon)

🌿Biodiversity Index (Shannon-Wiener)

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🌿Biodiversity Index (Shannon-Wiener)