Estimate how long a quantity takes to double at a constant compounded growth rate.
Doubling Time Calculator
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Doubling time
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Table of Contents
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What is Doubling Time?
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How to Use This Calculator
- Enter or select Increase.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Time = ln(2)/ln(1+r)
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Variables Explained
| Input | What it means |
|---|---|
| Increase | Use the measured or stated value for this item, with the unit or category shown beside the field. |
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Worked Example
At 10% growth per period, doubling takes about 7.27 periods.
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Why Use This Calculator?
Compare the result with the underlying statement, budget or proposed transaction. It is most useful when every amount uses the same reporting period and the same accounting definition.
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Common Mistakes
- Use a decimal rate in the formula; a zero or negative growth rate does not produce ordinary doubling.
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Frequently Asked Questions
Should I use monthly or annual figures?
Use one consistent period for every amount and rate in the relationship. If a form specifies an annual rate or a monthly amount, follow that label rather than mixing time periods.
Does the result include fees and tax?
Only the costs and taxes represented by the inputs and formula are included. A real transaction can include other charges, so compare the estimate with the underlying agreement or statement.
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Sources & References
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