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指数成長計算機

制約のない指数成長 N(t) = N0*e^(rt)。

はじめに

Exponential Growth Calculator — Unrestricted exponential growth N(t) = N0*e^(rt). Enter Initial population, Growth rate (r), Time to get an instant, accurate result.

計算式

N(t) = N₀ × e^(rt), the same unconstrained exponential growth model as the general population growth calculator, where N₀ is the initial quantity, r is the continuous growth rate, and t is elapsed time.

ステップごとの説明

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

実例

Example: With Initial population = 100, Growth rate (r) = 0.1, Time = 10, the Exponential Growth Calculator gives Population: 271.8282.

よくある質問

Is this the same formula used for compound interest or radioactive decay?
It's the same continuous-growth mathematical form — the only difference is the sign and meaning of r (positive r for growth, negative r for decay processes like radioactive decay).
What does r actually represent biologically?
It's the intrinsic (per-capita) growth rate — the fraction by which the population would grow per unit time if growth were unconstrained.
What inputs does the Exponential Growth Calculator need?
You'll need to provide: Initial population, 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 Exponential Growth Calculator?
The Exponential Growth Calculator applies the formula exactly as calculated — N(t) = N₀ × e^(rt), the same unconstrained exponential growth model as the general population growth calculator, where N₀ is the initial quantity, r is the continuous growth rate, and t is elapsed time. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Exponential Growth Calculator free to use?
Yes, the Exponential Growth Calculator is completely free, requires no signup, and runs instantly in your browser.

指数成長計算機について

The Exponential Growth Calculator uses a real, verifiable formula — N(t) = N₀ × e^(rt), the same unconstrained exponential growth model as the general population growth calculator, where N₀ is the initial quantity, r is the continuous growth rate, and t is elapsed time. — so results are accurate every time, not an approximation.