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Calculators/Science/Ecology

Ecology calculators

Population and diversity formulas for the field, plus grazing capacity, stocking rate, travel emissions and the carbon standing in a measured tree.

Logistic population growthPopulation size over time under a fixed carrying capacity (Verhulst model).Shannon diversity indexBiodiversity of a community from species counts.Lotka–Volterra predator–prey ratesInstantaneous population growth rates for a classic predator–prey pair.Kaya identity (CO₂ emissions)Global CO₂ emissions decomposed into population, wealth, energy and carbon factors.Tree basal areaCross-sectional trunk area at breast height (DBH), the standard forestry measure of stand density.Animal mortality ratePercentage of a population lost to death over a period, accounting for births during that period.Livestock stocking rateStocking rate in standard animal units per hectare, against the carrying capacity of the land and the head count it supports.Travel emissionsCarbon dioxide equivalent for a journey from an emission factor you supply, split per person and priced at an offset rate.Tree carbon storageCarbon and carbon dioxide stored in a tree, from its measured size, wood density and carbon fraction rather than a species equation.Wind turbine power outputElectrical power generated by a wind turbine from rotor size, wind speed and efficiency.Hydroelectric power outputPower generated by a dam turbine from head, flow rate and efficiency.

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PhysicsChemistryBiologyRenewable Energy