How to use (3 steps)
- Select an example or enter a count table (labels and counts).
- Adjust Shannon log base or display options if needed.
- Shannon, Simpson, and (optional) Hill numbers/evenness are shown.
Diversity indices depend on sampling and preprocessing (filtering, normalization, etc.). Interpret results together with conditions.
Input (count table)
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Input mode
| label | count | Actions |
|---|
Paste (TSV/CSV)
Two columns: label, count (header optional).
Paste (TSV/CSV)
First column is label, remaining columns are samples (header recommended).
Display options
Results (Shannon & Simpson)
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N (total)
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S (species/categories)
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Shannon H
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ln: —
Simpson
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D: — / 1−D: — / 1/D: —
Hill numbers (q=0/1/2)
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—
—
Evenness (Pielou J)
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Relative abundance (p)
Shannon contribution (−p ln p)
Top categories
| label | count | p |
|---|
Outputs
How it’s calculated
- Compute proportions p and calculate Shannon (−Σp ln p) and Simpson (Σp² etc.).
- Because “Simpson” varies by field, D/1−D/1/D are shown together.
- Hill numbers (q=0/1/2) and evenness can be shown as references.
FAQ
What is the difference between ln and log2 for Shannon?
Only the log base changes; rankings do not. Choose based on field conventions (default is ln).
Which one is the “Simpson index”?
Literature varies between D (Σp²), 1−D, and 1/D. This tool shows all three.
Is it okay to include zero counts?
Yes. They are treated as p=0 with zero contribution.
Can I compare samples?
Yes. Multi-sample (by columns) mode calculates indices for each column.
Are my inputs sent anywhere?
All calculations run in your browser. Your data is not sent.
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