Biology
How to use?
Simulators that model living systems: from population dynamics to cellular processes, with visualizations that show how they evolve over time.
Who is it for?
Students of biology, medicine, and related fields who need to explore quantitative models beyond equations.
How to use them?
Pick a simulator, adjust the parameters, and observe how the system responds. Each tool includes a Fundamentals section with the biological and mathematical model behind it.
Scope
Covers classic quantitative biology models — genetics, ecology, physiology, epidemiology — and grows with new additions.
11 calculators · 9 widgets
Cell Doubling TimeCalculate doubling time and growth rate from cell population data
Enzyme Kinetics (Michaelis-Menten)Simulate Michaelis-Menten enzyme kinetics and reversible inhibition models: reaction velocity, kcat, catalytic efficiency, and Lineweaver-Burk plots
Fick Membrane DiffusionSimulate passive membrane diffusion with Fick's law: initial flux, permeability, membrane resistance, and time to equilibrium
Lotka-Volterra Population DynamicsSimulate Lotka-Volterra predator-prey dynamics with RK4 integration: time evolution, phase space and equilibrium points
Mendelian Cross Simulator (Complete Dominance)Simulate 1-4 gene Mendelian crosses under complete dominance with Punnett square and statistical probability panel
SIR Model: Epidemiological SimulatorSimulate the spread of infectious diseases with the SIR model and RK4 method: S-I-R curves, R₀, infection peak and herd immunity threshold
Hardy-Weinberg EquilibriumComputes allele (p, q) and genotype (p², 2pq, q²) frequencies from a single input, with an optional χ² goodness-of-fit test to validate equilibrium in observed populations
Membrane Potential (Goldman-Hodgkin-Katz)Calculate the resting membrane potential and Nernst potential using the Goldman-Hodgkin-Katz equation for Na⁺, K⁺, Cl⁻ and Ca²⁺ with configurable permeabilities
Diagnostic Validity (Bayes' Theorem)Apply Bayes' Theorem to a diagnostic test: compute PPV, NPV, accuracy, likelihood ratios (LR+, LR−), Youden's index and DOR. Visualise the prevalence paradox with a natural-frequency tree, 2×2 table and PPV vs prevalence curve
Lipid Profile & LDL CholesterolEstimates LDL cholesterol via Friedewald, Sampson-NIH (2020) and Martin-Hopkins, with non-HDL, VLDL and the Castelli I/II and TG/HDL atherogenic indices. Bidirectional input, mg/dL ↔ mmol/L conversion and clinical alerts
Primer Melting Temperature (Tm)Computes PCR primer Tm with the Nearest-Neighbor model (SantaLucia 1998) and Owczarzy salt correction (Na⁺/Mg²⁺/dNTP). Reports ΔG, ΔH, ΔS, %GC, annealing temperature, melting curve and primer quality checks