๐Population Growth Calculator
Model exponential or logistic growth from initial population, growth rate, and time.
Runs entirely in your browser. No data is sent to a server.
Free Population Growth Calculator
Modeling population dynamics for a biology class or ecology project? Our free population growth calculator handles both exponential and logistic growth models. Enter your starting population, growth rate, and time period, and get the projected population instantly โ plus a chart showing exactly how the curve develops over time.
Switch to logistic growth to add a carrying capacity and see how growth slows as the population approaches its environmental limit. Doubling time is calculated automatically for exponential growth, and a full table of values at regular time intervals shows the whole trajectory, not just the endpoint.
Whether you're studying ecology, working through a population genetics problem set, or modeling real-world growth data, this calculator gives you accurate results with the underlying formulas shown. Free, instant, no sign-up required. See the About page or the FAQ for more.