Population Growth Calculator (Exponential & Logistic)
Project population size with exponential or logistic growth; doubling time from growth rate.
How to use the Population Growth Calculator
- Enter or select: Initial population N₀, Growth rate r (per time unit), Time.
- Fill in what you know of: Carrying capacity K (logistic) — leave the unknown empty.
- The results (Exponential N(t), Logistic N(t), Doubling time) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- Exponential: N = N₀e^(rt)
- Logistic: N = K / (1 + ((K − N₀)/N₀)e^(−rt))
- t_d = ln2 / r