Rule of 70 Doubling Time Calculator

Calculate Doubling Time

Formula

To calculate the doubling time:

\[ T = \frac{70}{r} \]

Where:

What is Rule of 70 Doubling Time?

The Rule of 70 Doubling Time is a simple formula used in finance and economics to estimate how long it will take for an investment or quantity to double in value given a fixed annual growth rate. The formula states that you can approximate the doubling time by dividing 70 by the annual growth rate expressed as a percentage. For example, if the growth rate is 7%, the doubling time is approximately 10 years (70 divided by 7).

Example Calculation

Let's assume the following growth rate:

Using the formula:

\[ T = \frac{70}{5} = 14 \text{ years} \]

The doubling time is approximately 14 years.