To calculate interest earned on investments start by inputting the amount that you initially invested. Below is the compound interest formula on how to calculate compound interest. What is the compound interest formula.
R Rate of interest.
A is the future value of investmentloan including interest earned P is the the principal investment or loan amount. The formula for compound interest is P 1 rn nt where P is the initial principal balance r is the interest rate n is the number of times interest is compounded per time period and t is the number of time periods. R Rate of interest. FV final value final amount future value.