Compound interest calculator
Principal, rate, years, and how often it compounds. Final amount and interest earned.
CopiedAbout this compound interest calculator
Start with a principal, an annual rate, compounding frequency, and time. See how the balance grows when interest is added on a schedule.
A = P(1 + r/n)^(n t) for compound interest with n periods per year. Some modes also accept regular contributions; those use the standard future-value-of-annuity add-on when present on the form.
Not investment advice and not inflation-adjusted real return unless you run inflation separately. Fees, taxes, and market volatility are omitted on purpose.
FAQ
What formula is this? A = P × (1 + r/n)^(n×t). r is the annual rate as a decimal, n is compounds per year, t is years.
What is interest earned? Final amount minus principal.
Does this send my numbers anywhere? No. The math runs in your browser.