Divide Shannon's diversity index H by natural logarithm of species richness ln(S) to calculate the species evenness. In the example, 0.707 divided by 1.099 equals 0.64. Note that species evenness ranges from zero to one, with zero signifying no evenness and one, a complete evenness.

What is the formula for species richness?

Species richness is the number of species in a given area. To calculate species richness, you will count the number of cells below each vegetation type that contains a species name. The function =COUNTIF(range, "*") will calculate the total number of cells you highlight that contain any text.

What is species evenness in biology?

Species evenness is a description of the distribution of abundance across the species in a community. Species evenness is highest when all species in a sample have the same abundance. Evenness approaches zero as relative abundances vary.