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Shannon Diversity Index — result sheet
Calculate descriptive Shannon diversity and evenness from a bounded list of entered species or group counts.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: For total N, p_i = count_i/N and H = -sum(p_i ln p_i) over positive counts; evenness = H/ln(S), where S is the number of positive groups and evenness is 0 when S <= 1.
This calculator summarizes an entered sample count list with total count, Shannon diversity in natural-log units, and Shannon evenness. It is a descriptive sample-diversity calculation only: it is not a biodiversity assessment, ecological diagnosis, conservation conclusion, site survey, or ecological advice.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Species or group counts — counts; Enter up to 50 nonnegative decimal counts separated by commas, semicolons, or whitespace.
Worked example
| Input | Value |
|---|---|
| Species or group counts | 10, 20; 30 40 |
Total count 100; Shannon diversity about 1.279854 nats; Shannon evenness about 0.923220.
Assumptions and limits
- Each value is a finite nonnegative decimal count for one entered species or group, and the list has no more than 50 values.
- The positive counts are treated as one comparable sample, proportions are formed from their total, and zero-count groups contribute no logarithmic term.
- Natural logarithms define H in nats; the result describes the supplied sample record and does not infer habitat condition, species identity, sampling quality, or ecological action.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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