Ecology Calculators
Habitat Edge-to-Area Ratio Calculator
Calculate the edge-to-area ratio of a habitat patch to assess fragmentation and available core habitat.
Logistic Population Growth Calculator
Calculate population size over time using the logistic growth model, which accounts for a fixed environmental carrying capacity.
Net Primary Productivity Calculator
Calculate net primary productivity (NPP) by subtracting respiration from gross primary productivity (GPP).
Population Doubling Time Calculator
Calculate how long it takes a population growing at a constant rate to double in size, using the exact natural-log formula.
Population Growth Rate Calculator
Calculate future population size using the exponential growth model from initial population, growth rate, and time.
Predator-Prey Ratio Calculator
Calculate the prey-to-predator ratio in an ecosystem from prey and predator population counts.
Shannon Diversity Index Calculator
Calculate the Shannon Diversity Index (H) from species abundance data to measure biodiversity in an ecological community.
Simpson's Diversity Index Calculator
Calculate Simpson's Diversity Index (D) from species abundance data, the probability two random individuals belong to different species.
Species Richness Index Calculator
Calculate species richness using Margalef's Index, which normalizes species count by sample size.
Trophic Energy Transfer Calculator
Calculate how much energy remains after passing through multiple trophic levels using the 10% ecological transfer rule.
The Math Behind Ecosystems
Ecology is built on quantitative models: exponential and logistic population growth, diversity indices that turn a messy species count into a single comparable number, and energy transfer rules that explain why food chains rarely run past four or five levels. This category covers the core formulas ecology students and naturalists actually use.
Calculate population growth and doubling time, score biodiversity with the Shannon or Simpson index, estimate species richness, and work through trophic energy transfer and net primary productivity — all with the standard equations used in ecology coursework and field research.