🧬 Biology

Biology Calculators

14 free biology calculators with clear, detailed guides.

All Biology Calculators

Carrying Capacity Calculator (Logistic Growth)
Calculate logistic population growth toward a carrying capacity (K). Find population at any time, growth phase, and the maximum sustainable yield point.
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Cell Division & Mitosis Calculator
Calculate number of cells after mitosis, time through the cell cycle, and DNA content at each stage. Compare mitosis and meiosis outcomes.
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DNA Base Pair & Molecular Weight Calculator
Calculate DNA base pair composition, molecular weight, melting temperature, and GC content from a DNA sequence or base pair count.
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Doubling Time Calculator (Rule of 70)
Calculate doubling time from a growth rate using the exact formula and the Rule of 70. Works for population, investments, and any exponential growth.
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Enzyme Kinetics Calculator (Michaelis-Menten)
Calculate reaction velocity, Km, and Vmax using the Michaelis-Menten equation. Plot the Lineweaver-Burk equation and understand enzyme inhibition.
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Hardy-Weinberg Equilibrium Calculator
Calculate allele frequencies, genotype frequencies, and test for Hardy-Weinberg equilibrium in a population. Includes observed vs expected comparison.
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Mendelian Genetics & Punnett Square Calculator
Calculate Punnett square ratios for monohybrid and dihybrid crosses. Find offspring genotype and phenotype probabilities for dominant/recessive and.
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Osmosis & Osmotic Pressure Calculator
Calculate osmotic pressure, water potential, and the direction of osmosis for any solution concentration. Covers plant water potential and van't Hoff equation.
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Photosynthesis Rate & Light Intensity Calculator
Calculate the rate of photosynthesis from oxygen production data. Explore limiting factors including light intensity, CO2 concentration, and temperature.
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Population Density Calculator
Calculate population density — people per square kilometre or square mile. Compare areas, convert between units, and interpret density figures.
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Population Genetics & Allele Frequency Calculator
Calculate allele frequency changes due to natural selection, genetic drift, and mutation. Model selection coefficients and fitness effects on population.
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Population Growth Calculator
Calculate exponential and logistic population growth. Find doubling time, carrying capacity effects, and population size at any point in time.
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Population Growth Rate Calculator
Calculate the annual population growth rate from two population figures. Find the percentage growth rate, doubling time, and absolute change.
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Population Projection Calculator
Project future population from a current figure and growth rate. Forecast population size at any year using exponential or linear models.
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About our biology calculators

Our biology calculators cover genetics, population dynamics, cell biology, and biochemistry — from Hardy-Weinberg equilibrium and Mendelian genetics to population growth, carrying capacity, enzyme kinetics, osmosis, and photosynthesis. Each pairs an instant result with an explanation of the biological principle at work.

Biology calculations often involve exponential growth, ratios, and equilibrium relationships that are easy to set up wrongly by hand. These calculators handle the maths reliably and the guides explain the biology — allele and genotype frequencies, logistic versus exponential growth, Michaelis-Menten kinetics, and more — with worked examples and the assumptions each model makes.

Aimed at GCSE, A-level, and undergraduate biology students as well as teachers and the simply curious, every calculator is free, needs no sign-up, and is written to make the underlying biology clear.