A certificate of deposit is the financial equivalent of a slow cooker: set it, forget it, and collect a predictable result. You lock a lump sum with a bank for a fixed term at a guaranteed rate, and compounding does the rest. This calculator shows the maturity under two compounding styles because the difference is real money — annual compounding applies the APY once a year, while quarterly compounding applies one-fourth of the rate four times a year, letting each quarter's interest start earning its own interest sooner.

Park $25,000 at 5% APY for 3 years. With annual compounding you collect about $28,940; quarterly compounding nudges that to roughly $29,015. The gap looks small until you scale it — on $250,000 over 10 years, compounding frequency alone can swing the outcome by thousands. The Interest Earned figure isolates exactly what your money did versus what you deposited.

CDs will never beat equity over long horizons, but they are unbeatable for money with a date attached: a house down payment in two years, tuition next fall. They are also FDIC-insured up to $250,000 per bank, so the guarantee is real. Match the Term (years) to the goal and let certainty do its quiet work.

With the pre-filled defaults — Deposit Amount ($) 10,000, Annual Percentage Yield (APY %) 4.5, Term (years) 3 — the CD Calculator returns Maturity (Annual compounding) 11,411.66, Maturity (Quarterly compounding) 11,436.74, Interest Earned (annual, $) 1,411.66. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.