About this tool
This free compound interest calculator shows how savings and investments grow over time when interest is added to interest. It works as a savings calculator for regular monthly deposits.
How compound interest works
- Enter your starting amount. What you have saved or invested now.
- Add a monthly amount. What you'll add each month. Leave it at 0 for a one-off deposit.
- Enter the rate and years. See the final balance and how much of it is interest.
Questions people ask
What is compound interest?
Interest earned on both your money and the interest it has already earned, so savings grow faster over time.
What is the compound interest formula?
A = P(1 + r/n)^(nt), where P is the starting amount, r the yearly rate, n how often interest is added and t the years.
Is this financial advice?
No. It's a calculator to compare scenarios; real returns can be higher or lower.
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