Rule of 72 Calculator
Quickly estimate how long it takes to double your money. The Rule of 72 gives a simple approximation based on your interest rate.
Inputs
%
Results
Years to Double (Rule of 72)
9 years
Exact Years to Double9.01 years
Doubled Amount$20,000
Years to Triple14.27 years
Years to Quadruple18.01 years
Years to Double (Rule of 72)
9 years
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- Annual Interest Rate — Annual interest rate as a percentage. Accepts values from 0.1 % to 50 % (default: 8 %).
- Expand "Advanced Options" for additional fine-tuning. These optional inputs let you model more specific scenarios:
- Starting Amount — enter a dollar amount. Accepts values from $1 to $100,000,000 (default: $10,000).
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Years to Double (Rule of 72) — shown as a numeric value. This is the primary result of this calculator.
- Exact Years to Double — shown as a numeric value.
- Doubled Amount — shown as a dollar amount.
- Years to Triple — shown as a numeric value.
- Years to Quadruple — shown as a numeric value.
- View the Growth Over Time below for a visual breakdown of how the numbers relate to each other.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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