Free Compound Interest Calculator Online
Calculate the future value of your investment or savings with compound interest. Choose compounding frequency and see year-by-year growth.
View Year-by-Year Growth
| Year | Investment | Interest Earned | Total Amount |
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About the Compound Interest Calculator
Compound interest is the process of earning interest on both your initial principal and the interest already accumulated. Albert Einstein reportedly called it the "eighth wonder of the world" — those who understand it earn it, those who don't pay it.
This calculator uses the standard compound interest formula: A = P × (1 + r/n)^(n×t), where P is the principal, r is the annual interest rate (as a decimal), n is the number of compounding periods per year, and t is the time in years. The interest earned is simply A − P.
More frequent compounding (monthly vs annually) results in slightly higher returns because interest is calculated and added to the principal more often, allowing subsequent interest to accumulate on a larger base.
How to Use the Compound Interest Calculator
Enter Principal Amount
Type the initial investment or savings amount in rupees.
Enter Interest Rate
Enter the annual interest rate (%) offered by your bank or investment scheme.
Select Compounding Frequency
Choose how often interest is compounded — annually, semi-annually, quarterly or monthly.
Click Calculate
See your final amount, interest earned and a complete year-by-year growth breakdown.
Frequently Asked Questions
Compound interest is interest calculated on both the initial principal and the interest that has already been accumulated. This differs from simple interest, which is only calculated on the principal. Over time, compound interest causes your money to grow exponentially rather than linearly.
More frequent compounding always produces slightly higher returns. Monthly compounding yields more than quarterly, which yields more than semi-annual, which yields more than annual. The difference becomes more significant over longer time periods and at higher interest rates.
Yes. Your principal, rate, years and compounding frequency are saved to your browser's localStorage and automatically restored the next time you visit. No data is ever sent to any server — everything stays on your device.
Simple interest is calculated only on the original principal, so the interest amount remains the same each period. Compound interest is calculated on the principal plus accumulated interest, so the interest amount grows each period. For the same principal, rate and time, compound interest always results in a higher final amount.