How to use this calculator

Enter the values shown and apply the formula Doubling time = ln(2) / ln(1 + rate/100).

The method

Doubling time = ln(2) / ln(1 + rate/100)

Enter your values in the labeled fields and choose Calculate. The result panel shows the answer and supporting values when useful.

WORKED EXAMPLE INPUT

Growth rate (%): 7

Select Calculate to evaluate these example values.

Scope and limitations

Rate must be positive.

Common questions

Can I change the example values?

Yes. Replace every prefilled value with your own inputs and calculate again.

Are displayed results exact?

Some results are rounded for readability. Keep extra precision when the next step depends on the result.

Methods & verification

Formulas use standard mathematical definitions and fixed unit factors where applicable. See our methodology for numerical conventions, rounding, privacy, and limitations.