Calculate compound interest with daily, monthly, quarterly, or annual compounding. Includes year-by-year growth table. Free online investment calculator.
A = P · (1 + r/n)^(n·t) + M · ((1 + r/n)^(n·t) − 1) ÷ (r/n)P = principal, r = annual rate (decimal), n = compounds per year, t = years. M = annual contribution ÷ n per period (0 if unused). More frequent compounding yields a higher final amount.