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Compound Interest

Future value with principal, rate, years, recurring contributions and compounding frequency.

Future value
Total invested
Total interest
YearContributedBalanceInterest
Enter principal, annual rate, years, and an optional recurring contribution (per month or per year). The future value uses A = P(1 + r/n)^(nt) for the lump sum, plus the annuity-future-value formula for recurring contributions at the matching period rate; n is the compounding frequency per year. Interest = future value − total invested. The table shows year-by-year contributed amount, ending balance and interest earned. All math runs in your browser.