Compound Interest Calculator
Calculate deposit growth with compound interest: initial amount, monthly contributions, yearly chart. See how much your savings earn over time.
Why compound interest matters
Compound interest is interest that itself earns interest. In the first years the effect is modest, then the curve bends upward — and after ten-plus years the interest often exceeds your own contributions. That is why financial advisors say the best day to start saving was yesterday. This calculator shows your personal curve year by year.
What it does
- Final amount for an initial deposit with monthly contributions.
- Interest earned on top of everything you put in.
- A growth chart by year so you can see the acceleration.
How to use
- Enter the initial amount and the monthly contribution.
- Set the annual rate and the horizon in years.
- Read the final amount, the interest share and the growth chart.
How it works
The calculator compounds monthly: every month the balance grows by the monthly rate plus your contribution, and the yearly points form the growth chart. All computation runs locally in your browser.
Frequently asked questions
What is capitalization?
It is when interest is added to the deposit itself and then earns interest too. Monthly capitalization at the same annual rate always outperforms yearly payouts.
Does it account for inflation and taxes?
No — the result is nominal. To see real purchasing power, subtract expected inflation from the rate. Taxes on interest depend on your jurisdiction.
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