Solve for the investment rate needed to grow your portfolio from a present value to a target future value. Calculate the effective annual rate, periodic rate, and Rule of 72 doubling time based on your investment timeline.
Enter your details and click Calculate to see results.
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Input your current investment amount or starting balance.
Input the target amount you want to reach. Must be greater than present value.
Enter the number of years for your investment horizon.
Select how often interest compounds to see periodic and effective rates.
The formula FV = PV(1 + r/n)^(nt) is rearranged to solve for r: r = n × [(FV/PV)^(1/(n×t)) - 1]. This gives the nominal annual rate.
The EAR = (1 + r/n)^n - 1 converts the nominal rate to show the true annualized return accounting for compounding frequency. Higher compounding frequency yields a higher EAR.
Using the Rule of 72 approximation or exact calculation: t = ln(2) / (n × ln(1 + r/n)). This tells you how many years it takes for your investment to double.
This calculator is useful for evaluating whether a proposed investment meets your growth requirements, comparing investment options, and benchmarking against market returns.
It solves for the required compound interest rate to grow a present value (PV) to a specified future value (FV) over a given number of years with a chosen compounding frequency.
