A Simple Guide to Doubling Your Money: Rule of 72
Hey there, fellow investors! If you're looking to grow your money effectively, you're in for a treat today. Let’s talk about a handy little tool that can help you estimate how long it’ll take to double your investment—The Rule of 72. This simple formula gives you an easy way to assess how fast your money could grow based on the annual compounded return. Ready to dive in? Let's get started!
What is the Rule of 72?
The Rule of 72 is a quick and easy formula to estimate how long it’ll take for your money to double. Here’s how it works: you simply take the number 72 and divide it by your expected annual return (compounded). The result will give you a rough idea of how many years it will take for your investment to grow. It's a pretty neat trick! While the exact origins of the Rule of 72 are a bit unclear, its value in helping you make sense of investment growth is crystal clear.
How to Use the Rule of 72
Using the Rule of 72 is simple! Just follow these steps:
- Identify Your Expected Rate of Return: What kind of annual return are you aiming for? This could be from stocks, bonds, or any other investment you're considering.
- Calculate the Time to Double: Take 72 and divide it by your expected return. That's it! The result will give you an estimate of how many years it will take for your investment to double.
Let’s Break It Down with Some Examples:
- If your expected return is 10%, the calculation would be:

So, if you expect a 10% return, it’ll take about 7.2 years to see your investment double!
- If your expected return is 15%, the calculation would be:

With a 15% return, you’re looking at roughly 4.8 years to double your money! Talk about exciting growth!
Reverse Calculation: Finding the Required Rate of Return
The Rule of 72 is also useful for determining the rate of return you need to achieve in order to double your investment within a specific timeframe. Here’s how you can do it:
- Decide on Your Timeframe: Determine how many years you want to take to double your money.
- Calculate the Required Rate: Divide 72 by the number of years. The result will tell you the annual compounded rate of return you need.
For instance:
- If you want to double your money in 4.8 years, the calculation would be:

You would need a 15% annual return to achieve that goal.
- If you expect to double your money in 7.2 years, the calculation would be:

A 10% annual return will do the trick!
Conclusion
And there you have it! The Rule of 72 is a powerful yet super simple tool for anyone looking to grow their wealth over time. Whether you’re estimating how long it’ll take to double your investment or determining the return you need to meet your financial goals, this rule is a game-changer.
If you found this quick overview helpful, don’t forget to check out our other blogs for more educational content. Here’s to smart investing and reaching your financial dreams!
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