Welcome to the Serrari Rule of 72 Calculator

Ever wondered how long it takes for your money to double? Our Rule of 72 Calculator makes it easy to estimate how fast your investment can grow, without needing complex math.

The Rule of 72 is a quick formula that helps you find out either:

1. How many years it will take for your money to double, or
   
2. What annual interest rate you need to double your money in a set number of years.

How It Works

The formula is simple:
72 ÷ Interest Rate = Years to Double
or
72 ÷ Years = Required Interest Rate

This rule gives a close estimate of compound growth and is perfect for quick financial planning or comparing investment options.

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Example

If your money earns an annual interest rate of 8%, then:
72 ÷ 8 = 9 years
Your investment will roughly double in 9 years.

Or if you want to double your money in 6 years, then:
72 ÷ 6 = 12%
You’ll need an annual return of about 12%.

Parameters Explained

• Annual Interest Rate: The yearly rate of return or growth your money earns.
  
• Target Years to Double: The time period in which you want your investment to double in value.

Try It Out

Enter your interest rate or target years and click Calculate. You’ll instantly see how long it takes to double your money — or what rate you need to reach your goal.

The Serrari Rule of 72 Calculator is a fast and simple way to understand the power of compounding and plan your investments with confidence.

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