You can calculate compound interest with a simple formula. It is calculated by multiplying the first principal amount by one and adding the annual interest rate raised to the number of compound periods subtract one. The total initial amount of your loan is then subtracted from the resulting value.
Compound Interest = Total amount of Principal and Interest in future (or Future Value) less Principal amount at present (or Present Value)
Compound Interest = P [(1 + i) n – 1]
P is principal, I is the interest rate, n is the number of compounding periods.
An investment of ₹ 1,00,000 at a 12% rate of return for 5 years compounded annually will be ₹ 1,76,234. From the graph below we can see how an investment of ₹ 1,00,000 has grown in 5 years.
In compound interest, one earns interest on interest. Therefore, it already takes into consideration all the previous interests. And interest is paid on that.