Compound Interest Calculator - Growth
Free compound interest calculator with monthly contributions. See your future value, total interest, a growth chart and a year-by-year table. Print or export.
See how savings grow over time with compound interest and regular monthly contributions. Get the future value, the interest earned, a growth chart and a year-by-year table. Everything runs in your browser.
How to Use Compound Interest Calculator - Growth
- Enter your initial amount. This is the money you start with.
- Add a monthly contribution. Enter how much you add every month, or leave it at zero for a one-time deposit.
- Set the interest rate and years. Use the annual rate you expect and how long you will keep the money invested.
- Choose the timing. Pick whether contributions go in at the start or the end of each month.
- Read the results. See the future value, how much is interest versus your own money, a growth chart and a year-by-year table. Print, export a CSV, or copy a share link.
Frequently Asked Questions
What is compound interest?
Compound interest is interest earned on both your original money and on the interest already added. Over time this snowball effect makes savings grow faster and faster.
How often does this calculator compound?
It compounds monthly, which matches most savings and investment accounts. Interest is added each month, and your monthly contribution is added at the time you choose.
Does the timing of contributions matter?
A little. Contributing at the beginning of the month means each deposit earns interest one month sooner, so the final balance is slightly higher than contributing at the end.
Is the result guaranteed?
No. It assumes a steady interest rate the whole time. Real returns go up and down, so treat the figure as an estimate to compare options, not a promise.
Is my information sent anywhere?
No. Everything runs in your browser. Your numbers never leave your computer and it works offline once loaded.
Can I use it for any currency?
Yes. The math is the same in any currency. Amounts show a dollar sign, but the future value and totals are correct whatever you save in.