Rule of 72 Calculator

Discover the financial magic trick that instantly tells you how long it takes to double your money.

How Can the Rule of 72 Help Your Investing?

When planning your financial freedom or retirement, you don't always need complex spreadsheets to see how your money acts. The Rule of 72 Calculator acts as a brilliant rule-of-thumb to quickly evaluate the potential of different investments. From your bank's fixed deposit to the stock market, finding the "doubling time" puts returns into an easily understood context.

How to Use the Math Trick

  1. The Simple Step: Enter the expected annual interest rate of your investment (e.g., enter 12 for 12%).
  2. Calculate: The calculator simply divides the number 72 by your expected rate.
  3. The Result: The answer is the approximate number of years it will take 10,000 to turn into 20,000, or 1 Million into 2 Million.

The Golden Equation

Years to Double =
72 ÷ Return Rate

Example: 10% return expected.
72 ÷ 10 = 7.2 Years.

Common Average Doubling Times

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Savings Account (~3%)It will take roughly 24 Years to double your cash in a standard savings account.
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Government Bonds (~7%)It will take roughly 10.3 Years to double a safer fixed-return bond allocation.
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S&P 500 Index (~10%)It Historically takes roughly 7.2 Years to double your money in the broader stock market.

Frequently Asked Questions