Use Shannon Evenness when you need to compute Shannon evenness E = H / ln(S) from the Shannon natural-log diversity index and species count, requiring at least two species. Enter Shannon index and Species count using the definitions and units below so the result can be reproduced.

Shannon index

A finite measured or assumed value greater than or equal to 0.

Species count

An integer count or setting greater than or equal to 2, expressed in species.

The published tool contract uses this rule: Compute Shannon evenness E = H / ln(S) from the Shannon natural-log diversity index and species count, requiring at least two species.

Shannon evenness

The calculated shannon evenness.

The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.

Retain the original Shannon index and Species count values and their units alongside the result. Pielou Evenness is useful when you instead need to compute Pielou evenness J = H / ln(S) from the Shannon index and species count, requiring at least two species. Species Evenness Pielou provides another view by helping you compute Pielou evenness from natural-log Shannon entropy and species count.

• Pielou Evenness

  Compute Pielou evenness J = H / ln(S) from the Shannon index and species count, requiring at least two species.

• Species Evenness Pielou

  Compute Pielou evenness from natural-log Shannon entropy and species count.

• Pielou Corrected

  Compute corrected Pielou evenness as natural Shannon entropy divided by the natural logarithm of the species count, returning exactly zero when entropy is zero.