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Rule of 72 Calculator

Estimate how long it takes to double your investment.

United States · USD. This page uses a shared calculation model and may include US-specific assumptions. Selecting a country changes formatting, not local tax, eligibility or contribution rules. Amounts are not converted between currencies.

Input Parameters

7%
0.1%50%

Results

Years to Double
10.3 years
Exact Years
10.24 years
Rule of 72 Error
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Years to Double at Various Returns

Years to Double at Various Returns3%: Years to Double $24. 15%: Years to Double $4.8. Use the chart value controls or data table below to read all values.$0$6$12$18$243%6%8%15%3% — Years to Double: $244% — Years to Double: $185% — Years to Double: $14.46% — Years to Double: $127% — Years to Double: $10.38% — Years to Double: $910% — Years to Double: $7.212% — Years to Double: $615% — Years to Double: $4.8
  • 3%$24 (23%)
  • 4%$18 (17%)
  • 5%$14.4 (14%)
  • 6%$12 (11%)
  • 7%$10.3 (10%)
  • 8%$9 (9%)
  • 10%$7.2 (7%)
  • 12%$6 (6%)
  • 15%$4.8 (5%)

Choose a chart point to read its values.

View chart data table

Years vs Remaining Decade

Years vs Remaining DecadeThe values and percentages for each segment are listed below.Years: $10.3
  • Years$10.3 (100%)

Disclaimer: This calculator provides estimates for informational purposes only. Results are based on the inputs provided and standard financial formulas. Consult a qualified financial advisor before making financial decisions.

About This Calculator

The Rule of 72 Calculator estimate how long it takes to double your investment. It's built for anyone working with investing who wants fast, accurate numbers without building a spreadsheet.

Sources & Model Limits

United States · USD. This page uses a shared calculation model and may include US-specific assumptions. Selecting a country changes formatting, not local tax, eligibility or contribution rules. Amounts are not converted between currencies. Read our methods and correction policy.

    How It Works

    Enter your annual return (%), and the calculator instantly computes your years to double, exact years, rule of 72 error. For example, with Annual Return (%): 7%, the years to double comes out to 10.3 years.

    Key Benefits

    • 1See your years to double update instantly as you adjust any input
    • 2Compare different scenarios side by side before making a decision
    • 3Visualize the breakdown with a chart instead of raw numbers alone
    • 4Export your results as a PDF report or CSV file for your records

    Practical Tips

    • →Time in the market beats timing the market — start as early as you can
    • →Consistent contributions matter more than trying to predict short-term swings
    • →Keep an eye on fees — expense ratios and trading costs compound against you too
    • →Diversification reduces risk without necessarily reducing expected long-term return

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    Frequently Asked Questions

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