Compound Interest Calculator

See how your investments grow over time with the power of compound interest.

Initial Investment ($)

Annual Interest Rate (%)

Years

Regular Contribution ($)

Compound Frequency

Understanding Compound Interest

Compound interest is calculated on the initial principal and also on the accumulated interest of previous periods. The formula is A = P(1 + r/n)^(nt) + C[((1 + r/n)^(nt) - 1) / (r/n)], where P is principal, r is annual rate, n is compounding frequency, t is time in years, and C is the regular contribution per period.