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ロジスティック成長計算機

環境収容力Kを伴う個体群成長。

はじめに

Logistic Growth Calculator — Population growth with a carrying capacity K. Enter Initial population, Carrying capacity (K), Growth rate (r), Time to get an instant, accurate result.

計算式

Logistic growth model with carrying capacity K: N(t) = K / (1 + ((K − N₀)/N₀) × e^(−rt)), where N₀ is the starting population, r is the intrinsic growth rate, and t is elapsed time. Growth slows as N(t) approaches K.

ステップごとの説明

  1. Enter the Initial population.
  2. Enter the Carrying capacity (K).
  3. Enter the Growth rate (r).
  4. Enter the Time.
  5. Click Calculate to see your result instantly.

実例

Example: With Initial population = 100, Carrying capacity (K) = 10000, Growth rate (r) = 0.1, Time = 10, the Logistic Growth Calculator gives Population: 267.2363.

よくある質問

How is this different from exponential growth?
Exponential growth assumes unlimited resources and grows indefinitely; logistic growth adds a carrying capacity K that the population approaches but does not exceed, reflecting real resource limits.
What happens as t gets very large?
N(t) asymptotically approaches the carrying capacity K, regardless of the starting population size (as long as N₀ > 0).
What inputs does the Logistic Growth Calculator need?
You'll need to provide: Initial population, Carrying capacity (K), Growth rate (r), Time. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Logistic Growth Calculator?
The Logistic Growth Calculator applies the formula exactly as calculated — Logistic growth model with carrying capacity K: N(t) = K / (1 + ((K − N₀)/N₀) × e^(−rt)), where N₀ is the starting population, r is the intrinsic growth rate, and t is elapsed time. Growth slows as N(t) approaches K. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Logistic Growth Calculator free to use?
Yes, the Logistic Growth Calculator is completely free, requires no signup, and runs instantly in your browser.

ロジスティック成長計算機について

The Logistic Growth Calculator uses a real, verifiable formula — Logistic growth model with carrying capacity K: N(t) = K / (1 + ((K − N₀)/N₀) × e^(−rt)), where N₀ is the starting population, r is the intrinsic growth rate, and t is elapsed time. Growth slows as N(t) approaches K. — so results are accurate every time, not an approximation.