Compound Interest Calculator FREE
Grow a starting balance with regular contributions at any compounding frequency, and see how much of the result is interest.
Compound interest
Grow a starting balance with a regular contribution, and see how much of the result is interest rather than money you put in.
How this is calculated
A starting balance, a regular contribution and a rate, compounded as often as you choose. The result separates what you put in from what the interest added, which is the part people actually want to see.
The contribution is assumed to arrive once per compounding period, because that is what the closed-form formula requires. The tool states that assumption beside the frequency field rather than quietly mixing a monthly deposit into an annually compounded balance, which would overstate the result.
The chart is drawn from the same formula evaluated at each year mark rather than by accumulating, so a rounding error cannot walk along the curve. Contributions are drawn separately from the balance, so the gap between them is the interest.
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