# What is the Rule of 72?

# How long will it take for your investment’s value to double? This is a common question among investors, and the Rule of 72 aims to provide a quick and convenient estimate. While not precise, this rule offers a straightforward calculation that proves to be a useful tool for assessing the potential growth of investments and the impact of compound interest.

The Rule of 72 operates on a simple premise: to determine the number of years it takes for an investment to double in value, divide 72 by the fixed annual rate of return. The resulting quotient offers an approximation of the doubling time for the investment. Despite its simplicity, this rule provides valuable insights into the growth potential of various investments and aids stewards in making informed decisions.

For example, consider an investment projecting a 6% annual return. Applying the Rule of 72, a steward can quickly calculate that it takes approximately 12 years for the initial investment to double.

**$\frac{72}{6\mathrm{\%}}=12\text{years}$**

In another scenario, if an investment is anticipated to generate an 8% annual return, the Rule of 72 indicates that it would take around 9 years for the initial investment to double.

**$\frac{72}{8\mathrm{\%}}=9\text{years}$**

Finally, for an investment with a 3% annual return, the Rule of 72 suggests that it would take roughly 24 years for the initial investment to double.

**$\frac{72}{3\mathrm{\%}}=24\text{years}$**

It's important to acknowledge the rough nature of this calculation. For a more precise result, one should divide 69.3 by the rate of return. However, the simplicity and ease of use make the Rule of 72 an attractive option for stewards looking for a quick approximation. Additionally, this rule assumes a constant rate of return, which may not always reflect the reality of an investment. Despite these limitations, the Rule of 72 remains a valuable and accessible tool for stewards seeking a rapid estimate of the time required for their investments to double.

It's important to note that this rule is not a substitute for in-depth financial analysis or professional advice. Stewards should consider various factors, including market conditions, risk tolerance, and long-term financial goals when making investment decisions. However, the Rule of 72 can serve as a handy tool in the preliminary stages of assessing the growth potential of different investment opportunities.

The Rule of 72 offers a quick and convenient method for estimating the doubling time of investments based on a fixed annual rate of return. While not a precise calculation, its simplicity and accessibility make it a valuable tool for investors seeking a basic understanding of their investment's growth potential. Remember, when it comes to investment decisions, it's essential to conduct thorough research and, if needed, seek professional financial advice for a comprehensive and tailored approach to wealth management.