🌍 Ecology
Ecology calculators cover quantitative ecology: Shannon and Simpson diversity indices, species richness and evenness, carrying capacity, population growth, and related measures. Each page explains the formula, the conventions behind it, and the interpretation, with worked examples from real sample data. The methods follow standard ecological references, including Shannon (1948), Pielou (1966) and the general ecology texts, and the pages say what each index does and does not tell you. Diversity values depend on sampling effort and design, so the write-ups make the comparison caveats explicit. These tools support coursework and field analysis, and the calculations run entirely in your browser. The ecology pages explain how sampling effort changes the indices, and they cross-link the calculators so a single data set can be analysed several ways.
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Soil Texture Calculator
Classify soil from its sand, silt, and clay percentages.
Population Growth Calculator
Model exponential or logistic population growth and solve for population, time, or growth rate.
Logistic Growth Calculator
Calculate population with carrying capacity using the logistic equation N(t) = K / (1 + ((K−N₀)/N₀)·e^(−rt)).
Water Footprint Calculator
Estimate your daily and annual water footprint in litres and cubic metres, plus the virtual water embedded in everyday products like beef, cotton and coffee.
Simpson Diversity Index Calculator
Compute Simpson's Index (D), Simpson's Diversity (1−D), reciprocal (1/D), Shannon-Wiener (H′), Pielou evenness (J), and Berger-Parker dominance (d) from species counts in any sample.
Carbon Footprint Calculator
Estimate annual household CO2e in tonnes from car km, flights, electricity, gas, diet and consumption using DEFRA 2024 and EPA 2024 factors.
Shannon Diversity Index Calculator
Calculate Shannon diversity H′, Pielou evenness J′, species richness, total abundance, and Simpson diversity (1 − D) from comma-separated species counts.