Compound Interest Calculator

See how your investments grow with compound interest and regular contributions.

Initial Investment ($)

Annual Interest Rate (%)

Years

Monthly Contribution ($)

Compound Frequency

Understanding Compound Interest

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. The formula is A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounding frequency, and t is time in years. Albert Einstein reportedly called compound interest the eighth wonder of the world. The more frequently interest compounds, the faster your money grows.