The Rule of 72 Calculator offers a simple method to quickly estimate **how long it takes for an investment to double given a specific annual rate of return**.

This time-tested rule of thumb is ideal for investors planning their long-term financial goals and seeking to understand the power of compound interest.

## Rule of 72 Calculator

### How the Rule of 72 Calculator Works

With the Rule of 72 Calculator, you can easily determine how long it takes for your investment to double. Simply enter the expected annual rate of return in the designated field and click “Calculate.”

The calculator then divides 72 by your specified return rate and displays the number of years required for your capital to double. This method is perfect for quick estimations and assists you in planning your long-term financial objectives.

## Definition: What is the Rule of 72?

The Rule of 72 is a simple heuristic that helps investors quickly estimate how long it will take for an investment to double, based on a fixed annual rate of return.

The calculation is performed by dividing the number 72 by the expected annual interest rate or return percentage.

**The formula is:**

\( \text{Years to Double} = \frac{72}{\text{Annual Rate of Return (%)}}

\)

The Rule of 72 provides a quick estimate without complex compound interest calculations and is particularly useful for returns between 6% and 10%.

It helps investors understand the long-term growth rate of their investments and make informed financial decisions.

## Practical Example: When Does an Investment Double at a 5% Annual Return?

To calculate how long it takes for an investment to double with an annual return of 5%, we use the Rule of 72.

**The formula is:**

\( \text{Years to Double} = \frac{72}{\text{Annual Rate of Return (%)}}

\)

**Let’s plug in the 5% return into the formula:**

\)

This means that with a 5% annual return, it would take approximately 14.4 years for your investment to double. This method provides you with a quick estimate of how long it takes to double your capital growth based on the expected rate of return.

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