Compound interest calculator

Capital growth with reinvestment and regular contributions.

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How it works

Each period the capital grows by the given percent, and the next percent is calculated on the already larger sum — that is compound interest. With contributions the step formula is balance = balance × (1 + rate) + contribution, repeated for the number of periods.

Example: 1000 start, 5% per period, 24 periods, no contributions → about 3225 (×3.2). A modest rate over a long horizon produces disproportionate growth — the power of compounding.

This material is for informational purposes only and does not constitute individual investment advice.