Compound Interest Rate Calculator
Enter your principal, final balance, and the number of years to instantly back-calculate the annual compound interest rate. See at a glance what rate your investment or savings actually grew at, along with the total interest earned.
Input
$
$
yr
Result
Annual rate (annual compounding, 10-year term)
4.137974%
Principal
$1,000,000.00
Final amount
$1,500,000.00
Interest
$500,000.00
How it works
- Enter the principal, final amount, and investment period, and the tool back-calculates the annual rate assuming annual compounding.
- The formula is r = (final amount / principal)^(1 / years) - 1, and the resulting r is multiplied by 100 to display as an annual percentage.
- Annual compounding means interest is added to the principal once a year, and the following year's interest is earned on that combined balance. This tool assumes compounding once per year.
- Interest is calculated as "final amount - principal," and the principal, final amount, and interest are each shown on a separate card.
- The rate is displayed to about six decimal places, so you can check a precise yield from your actual results. Enter a principal and final amount greater than 0, and a period of 1 to 100 years.
- Note: the calculated rate is a theoretical value that ignores taxes, fees, additional contributions, and withdrawals. It does not guarantee actual yields or investment results.
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Compound Interest Rate Calculator