What Is an Annuity?

An annuity is a financial product that provides a series of equal periodic payments over time. Used widely in retirement planning, insurance products, and loan structures, annuities offer predictable cash flows that help individuals plan their financial future. This annuity calculator computes both present value and future value based on your payment amount, interest rate, and investment horizon.

How Annuity Calculations Work

Future Value: FV = PMT × [(1 + r)^n − 1] / r. Present Value: PV = PMT × [1 − (1 + r)^−n] / r. For annuity-due (payments at start of period), multiply the result by (1 + r). Where PMT = periodic payment, r = periodic rate (annual rate ÷ 12 for monthly), n = total periods.

Understanding Your Results

Future value shows the total amount your payments will grow to by the end of the investment period — including compound interest. Present value shows what that stream of payments is worth in today's dollars. The difference between future value and total contributions is pure interest earned through compounding.

Key Factors That Affect Annuity Value

Interest rate has the largest impact over long periods. A 7% rate doubles roughly every 10 years. Payment amount and frequency directly scale the result. Time horizon amplifies compounding — starting 10 years earlier can more than double the final value. Payment timing (ordinary vs. due) affects value by one period of growth.

Tips and Best Practices

Compare annuity returns against index funds (historical 7–10% average) before purchasing insurance-based annuities. Max out tax-advantaged accounts (401k, IRA) before buying annuity products. Fixed annuities offer guaranteed rates; variable annuities carry market risk but higher potential returns.