Enter your starting amount, rate and years — the results update as you type.
—Final balance
—Total contributed
—Total interest
About the Compound Interest Calculator
This free compound interest calculator shows how savings grow when your interest earns interest. Enter a starting amount, an annual interest rate, the number of years, an optional monthly contribution, and how often interest compounds — and it shows your final balance, everything you put in, and the interest earned.
Results update as you type and everything runs in your browser; nothing is uploaded.
Why compound interest matters
With compound interest, each period's interest is added to your balance, so the next period earns interest on a bigger number. Over years — especially with regular contributions — that snowball makes a big difference compared with simple interest.
Features
- Final balance, contributions and interest at a glance
- Monthly contributions included in the growth
- Compounding monthly, quarterly, annually or daily
- Updates as you type
- 100% in your browser — no sign-up, nothing uploaded
How to use it
- Enter your starting amount, annual rate and number of years
- (Optional) Add a monthly contribution and choose the compounding
- Read the result — final balance, total contributed and interest earned
