Compound Interest Calculator — free online
You put money aside and you want to know what it could turn into over the years. Doing that math by hand is slow, and it's easy to forget that interest earns its own interest. We added a free tool that does it for you — Compound Interest Calculator — right in your browser.
What it does
You enter your starting amount, the interest rate, and how long you're saving for. You can also add a regular contribution, like a monthly or yearly deposit. The tool then shows how the balance grows with compound interest — your money plus the interest it keeps earning on top.
Nothing leaves your device
Everything happens inside your browser. Your numbers are never uploaded to a server and nothing is saved anywhere. When you close the page, it's gone. You can use it as often as you like without an account.
How to use it
- Open Compound Interest Calculator and type in your starting amount, rate, and number of years.
- Add a regular contribution if you make one, monthly or yearly.
- Read the result to see the final balance and how it grew.
It's free with no limit. There are more small tools on the Apps page.