CD Calculator United States

A Certificate of Deposit, or CD, pays a fixed return in exchange for leaving your money untouched for a set term. This CD calculator takes the deposit, annual percentage yield and term a bank quotes and shows what your money will be worth when the CD matures, and how much of that is interest.

How the calculation works

The annual percentage yield (APY) a bank advertises already includes how often it compounds interest during the year, so you do not need to know whether interest is credited daily, monthly or quarterly. The value at maturity is your deposit multiplied by (1 + APY) raised to the number of years in the term. Subtract the deposit to get the interest earned. For example, $10,000 at a 4.5% APY for two years grows to $10,920.25, of which $920.25 is interest.

Why APY matters more than the rate

Two CDs can advertise the same interest rate and pay different amounts, because one may compound daily and the other annually. APY reflects the compounding schedule, so a CD with a higher APY pays more over a year than one with a lower APY. Compare APY figures when you shop. The calculator asks for APY for the same reason, so the result matches what the bank is promising.

Choosing a term

CD terms typically range from a few months to five years or more. At the same APY, a longer term produces more total interest. In exchange, your cash is locked away, and withdrawing early usually triggers a penalty. Longer terms are not always paid a higher yield either; rate schedules move with the wider interest-rate environment, and a shorter CD is sometimes quoted at a better APY. Run each term you are offered through the calculator and compare the maturity values.

A worked example

Suppose you have $25,000 you will not need for three years and a bank offers a 4.00% APY CD. The maturity value is about $28,122, with roughly $3,122 of interest. If another bank offers 4.25% APY on the same three-year term, the maturity value is about $28,325, an extra $203 for a quarter of a percentage point. Small APY differences add up over multi-year terms, so compare offers side by side.

CD laddering

If you want the certainty of a CD without locking everything away for years, you can build a CD ladder. Instead of one long CD, you split the money across several CDs with staggered maturities, say one, two and three years. As each shorter CD matures, you take the cash or roll it into a new long CD. A ladder gives you regular access to part of your savings while still capturing the higher yields longer terms often pay. Model each rung by entering its deposit, APY and term in turn.

Assumptions and limitations

This is a planning estimate, not a bank statement. It assumes you hold the CD to maturity, that the APY stays fixed for the whole term (as on a standard fixed-rate CD), and that interest stays in the CD instead of being paid out along the way. It does not model early withdrawal penalties, promotional or bump-up rates that change mid-term, or tax on the interest. CD interest is generally taxable as ordinary income in the year it is credited, so your after-tax return will be lower than shown. For a specific product, confirm the APY, term, compounding and penalty terms in the bank’s disclosure before you commit, and ask a tax professional how the interest affects your return.

About This CD Calculator

Use this CD calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.