Compound Interest Calculator
See how savings grow with compound interest or profit, with optional monthly additions and a yearly table.
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About the Compound Interest Calculator
Compounding means you earn returns on your earlier returns as well as on the money you put in. Over many years, this makes a big difference.
Enter a starting amount, the expected annual rate and the number of years. Add a monthly amount to model regular saving, such as a monthly investment plan. The year-by-year table shows exactly how the balance grows.
How to use the Compound Interest Calculator
- Enter the starting amount (it can be 0 if you only save monthly).
- Enter the annual interest or profit rate and the number of years.
- Choose how often it is compounded and, optionally, a monthly addition.
- Click Calculate to see the final amount, total invested, total earned and the yearly table.
Formula
Without additions: A = P × (1 + r/n)^(n×t), where P is the starting amount, r the annual rate, n the compounding periods per year and t the years.
With monthly additions, the balance is simulated month by month: each addition is added at the end of the month and earns returns from then on.
Effective annual rate = (1 + r/n)^n − 1.
Examples
- Rs 100,000 at 12% compounded monthly for 5 years → Rs 181,669.67 (Rs 81,669.67 earned). Effective rate 12.683%.
- Rs 5,000 every month at 10% (monthly) for 10 years → Rs 1,024,224.89 from Rs 600,000 invested.
Frequently asked questions
Is the result guaranteed?
No. It assumes the same rate every year. Real returns on savings accounts, funds and shares change over time, and taxes or fees are not included.
Can I use it for Islamic profit-based savings?
Yes, mathematically. Enter the expected annual profit rate. Note that actual profit on Islamic products varies and is not fixed in advance.