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Compound Interest Calculator

Calculate compound growth with regular contributions and a year-by-year balance table.

Contributions arrive at the end of each selected period. Equivalent periodic growth is derived from the selected compounding frequency.

All amounts use the same currency of your choice. Rates are fixed; results are estimates rounded to two decimals.

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How compound growth works

Principal is your starting investment; contributions are new deposits. For nominal annual rate r, m compounding periods and f deposits per year, the deposit-period rate is i = (1 + r/m)^(m/f) − 1. Each period grows the existing balance, then adds the deposit. Interest earned is the final balance minus principal and contributions.

Assumptions and example

Deposits arrive at period-end, including when their frequency differs from compounding. At 10% annual compounding, 1,000 initially and 100 deposited each year become 1,420 after two years. Rates stay fixed; taxes, fees and inflation are excluded.

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