Savings
Compound Interest Calculator
Enter a starting balance, a monthly contribution, and an annual return to see how compounding grows your money — and how much of the final balance is interest.
| Year | Balance | Contributions | Interest |
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How compound growth is calculated
The future value combines the growth of your initial deposit with the growth of monthly contributions. The annual return is divided by 12 to get a monthly rate.
P is the initial deposit, C is the monthly contribution,i is the monthly return, and m is the number of months.
Frequently asked questions
What is compound interest?
Compound interest is interest earned on both your original balance and the interest that has already been added. Over long periods, it can grow faster than simple interest.
Does this assume monthly contributions?
Yes. Contributions are added monthly, and interest is compounded monthly. The annual return is converted to a monthly rate.
Is the return guaranteed?
No. The return is an assumption for projection purposes. Real investments fluctuate and can lose value. This is not a promise of future results.
This calculator is for educational purposes only and does not constitute financial advice. Results are estimates and may not reflect your exact situation.