🌿 Ecology & Evolution Calculators
Populations, growth models, diversity indices and enzymes. Browse 61 free ecology & evolution calculators, each with the formula, a worked example and an interactive chart.
Exponential Population Growth CalculatorPredict population size under exponential growth.Logistic Population Growth CalculatorModel population growth limited by carrying capacity.Population Density CalculatorCompute the density of a population in an area.Mark–Recapture Population EstimatorEstimate population size with the Lincoln–Petersen method.Population Change Rate CalculatorCompute net growth from births, deaths and migration.Simpson's Diversity Index CalculatorMeasure biodiversity of a community.Shannon Diversity Index CalculatorCompute the Shannon index and evenness of a community.Species–Area Relationship CalculatorPredict species richness from habitat area.Carrying Capacity from Resources CalculatorEstimate how many animals an area can feed.Ecological Efficiency (10% Rule) CalculatorFind energy at each trophic level.Lotka–Volterra Predator–Prey Equilibrium CalculatorFind equilibrium populations in the Lotka–Volterra model.Selection Allele Frequency Change CalculatorCompute allele frequency after one generation of selection against recessives.Genetic Drift Variance CalculatorEstimate the random change in allele frequency per generation.Inbreeding Coefficient CalculatorFind the inbreeding coefficient from relatedness.Expected Heterozygosity CalculatorCompute expected heterozygosity for multiple alleles.Michaelis–Menten Enzyme Kinetics CalculatorFind reaction velocity at a substrate concentration.Lineweaver–Burk Plot CalculatorFind Vmax and Km from a double reciprocal line.Competitive Inhibition CalculatorFind the apparent Km with a competitive inhibitor.Q10 Temperature Coefficient CalculatorFind how a biological rate changes with temperature.Photosynthesis Glucose and Oxygen Yield CalculatorCompute glucose and oxygen from CO₂ fixed.Cellular Respiration ATP Yield CalculatorEstimate ATP produced from glucose.Respiratory Quotient CalculatorFind the respiratory quotient from CO₂ and O₂ exchange.Allometric Scaling (Kleiber's Law) CalculatorEstimate metabolic rate from body mass.Cell Surface Area to Volume Ratio CalculatorCompute surface area to volume for a spherical or cubic cell.Leaf Area Index CalculatorCompute leaf area index of a canopy.Transpiration Rate CalculatorCompute water loss per leaf area over time.Finite Rate of Increase and Doubling Time CalculatorConvert a finite rate of population increase (lambda) into the intrinsic growth rate and doubling time.Maximum Sustainable Yield CalculatorFind the largest harvest a population can sustain indefinitely under logistic growth.Lotka-Volterra Equilibrium CalculatorFind the equilibrium prey and predator population sizes in the Lotka-Volterra predator-prey model.Beverton-Holt Population Model CalculatorPredict the next generation population using the Beverton-Holt density dependent model.Ricker Population Model CalculatorPredict the next generation population using the Ricker model, which can show overshoot and oscillation.Fishery Catch and Catch Per Unit Effort CalculatorEstimate a fishery catch from catchability, fishing effort and fish stock size.Water Use Efficiency CalculatorFind how much plant biomass is produced per cubic metre of water used.Berger-Parker Dominance Index CalculatorFind how much of a community belongs to its most common species from species counts.Margalef Species Richness Index CalculatorMeasure species richness adjusted for sample size from species counts.Disease Prevalence CalculatorFind the percent and per-1000 prevalence of infection in a sampled population.Herd Immunity Threshold CalculatorFind the share of a population that must be immune to stop an infection spreading, from its basic reproduction number.River Mixing Concentration CalculatorFind the pollutant concentration after a tributary joins a river, assuming complete mixing.Biomagnification Up the Food Chain CalculatorEstimate how a pollutant concentration grows at each trophic level of a food chain.Net Primary Productivity CalculatorFind the net primary productivity of plants from gross productivity and plant respiration.Litter Decomposition CalculatorFind how much leaf litter remains after a time and its half-life, from a decay rate constant.Canopy Light Penetration CalculatorEstimate how much light reaches the forest floor through a leaf canopy.Forest Mean Annual Increment CalculatorFind the average annual volume growth of a forest stand from its volume and age.Basal Area per Hectare CalculatorFind the cross-sectional area of tree trunks per hectare from tree count and diameter.Seed Dispersal Distance CalculatorEstimate the share of seeds that land beyond a given distance from the parent plant, assuming exponential dispersal.Holling Type II Functional Response CalculatorFind how many prey a predator eats per period using the Holling type II disc equation.Survival from Fishing and Natural Mortality CalculatorFind the annual survival of a fish or animal population from fishing and natural mortality rates.Lake Water Residence Time CalculatorFind how long water stays in a lake or reservoir from its volume and outflow.Equilibrium Population Under Harvest CalculatorFind the stable population size of a logistic population that is harvested at a constant rate.Dry Biomass from Wet Mass CalculatorFind the dry mass of a sample from its fresh mass and moisture content.Tree Height from Clinometer CalculatorFind the height of a tree from your distance to it and the angle to its top.Home Range Area CalculatorFind the area of a circular home range from its radius.Gravimetric Soil Moisture CalculatorFind the water content of a soil sample by weighing it before and after oven drying.Root to Shoot Ratio CalculatorFind the ratio of root and shoot dry mass of a plant.Relative Growth Rate CalculatorFind the relative growth rate of a plant or organism from two mass measurements.Hill Number Diversity CalculatorConvert the Shannon diversity of a community into the effective number of equally common species.NDVI Vegetation Index CalculatorCalculate the normalised difference vegetation index from near-infrared and red reflectance.Geometric Mean Population Growth CalculatorFind the average annual multiplication factor of a population from a series of counts.Dispersion Index CalculatorDecide whether a species is clumped, random or regular from counts per quadrat using the variance to mean ratio.Biomass Turnover Rate CalculatorFind how fast plant biomass is replaced from its productivity and standing biomass.Population Sex Ratio CalculatorFind the proportion of males and the male to female ratio in a sampled population.
About Ecology & Evolution calculators
Populations, growth models, diversity indices and enzymes. CalcDepo has 61 free ecology & evolution calculators. Each one shows the formula, the variables and their units, a worked example and a chart of how the result changes, so you can check homework, plan a lab or understand the idea behind the numbers.
Popular calculators here include Exponential Population Growth, Logistic Population Growth, Population Density, Mark–Recapture Population, Population Change Rate, Simpson's Diversity Index. Common searches in this category include “how fast will a population grow”, “carrying capacity”, “animals per square km”, “how many fish in the lake”.
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