Calculate the future value of an investment with compound interest. Set principal, interest rate, compounding frequency (daily/monthly/annually), time period, and optional recurring contributions.
A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounding periods per year, and t is time in years.
More frequent compounding yields slightly more. Daily compounding earns marginally more than annual, but the difference matters most for large principals over long terms.