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CD Calculator — Certificate of Deposit Interest

Enter your deposit amount, APY, and term to see your exact maturity value, total interest earned, and a year-by-year breakdown.

CD Calculator

Calculate the maturity value and interest earned on a Certificate of Deposit.

About CDs

What Is a CD vs a Savings Account?

A Certificate of Deposit (CD) is a time-deposit savings product offered by banks and credit unions. You agree to leave your money on deposit for a fixed term — commonly 3 months to 5 years — in exchange for a guaranteed interest rate. Because the bank can count on having your funds for a set period, CDs typically pay higher rates than regular savings accounts.

Unlike a savings account, which lets you deposit and withdraw freely, a CD locks your principal until maturity. Withdrawing early usually triggers a penalty — often several months of interest — so CDs are best for money you will not need during the term.

APY vs APR: What Is the Difference?

APR (Annual Percentage Rate) is the simple, non-compounded interest rate for the year. APY (Annual Percentage Yield) accounts for the effect of compounding within that year, so it reflects what you actually earn. The more frequently interest compounds, the wider the gap between APR and APY.

When comparing CDs from different institutions, always compare APY figures — not APR — to get an apples-to-apples view of the true return you will receive.

CD Laddering Strategy

A CD ladder is a technique for balancing higher rates with access to your money. Instead of putting all your savings into one long-term CD, you split the money across several CDs with staggered maturity dates — for example, one maturing in 1 year, another in 2 years, another in 3 years. As each rung matures, you reinvest it in a new long-term CD.

  • Higher average rate: Longer-term CDs typically offer better rates; laddering lets you capture those without locking everything away indefinitely.
  • Regular liquidity: A portion of your savings matures every year (or sooner), giving you access to funds without paying early-withdrawal penalties.
  • Rate-change flexibility: If interest rates rise, your maturing rungs can be reinvested at the new, higher rates instead of being locked into a single rate for the entire period.

How a Certificate of Deposit Works

A Certificate of Deposit (CD) is one of the simplest and safest savings instruments available. You deposit a lump sum with a bank or credit union for a fixed term, and the institution agrees to pay you a fixed interest rate for the duration of that term. At maturity, you receive your original deposit plus all the interest earned.

The trade-off is liquidity. Unlike a savings account, you typically cannot touch the principal without paying an early-withdrawal penalty — usually several months of interest. That constraint is why CDs pay more: the bank values the certainty of having your funds for a defined period.

Understanding APY and Compounding Frequency

  • APY (Annual Percentage Yield): The true annual return after accounting for compounding. Always use APY when comparing CDs — it gives you an apples-to-apples view of what you will actually earn.
  • Daily compounding: Interest is calculated and added to your balance every day, so tomorrow's interest is calculated on a slightly larger base. Over long terms this adds meaningful extra earnings.
  • Monthly compounding: Interest is added once per month. Very common among online banks and credit unions.
  • Quarterly / Annual compounding: Less frequent compounding means slightly less total interest at the same stated rate compared with daily or monthly compounding.

CD Laddering: How to Stay Flexible While Earning More

A CD ladder splits your savings across multiple CDs with staggered maturity dates — for example, equal amounts in 1-year, 2-year, 3-year, 4-year, and 5-year CDs. Each year, one rung matures and you reinvest it at the longest term available. Over time, the entire ladder earns long-term rates while still giving you access to a portion of your funds every year.

Laddering also hedges against interest-rate movements. If rates rise, your maturing CDs get reinvested at the new, higher rates rather than being locked in at a single rate for the full term. If rates fall, you still have existing rungs locked in at the older, higher rates.

Frequently Asked Questions

Are CDs FDIC insured?

Yes — CDs held at FDIC-member banks are insured up to $250,000 per depositor, per institution, per account ownership category. Credit union CDs are covered by the NCUA under equivalent limits. This makes CDs one of the lowest-risk savings vehicles available.

What happens if I withdraw early?

Most CDs charge an early-withdrawal penalty. Common penalties range from 90 days of interest for short-term CDs to 12 months or more of interest for multi-year CDs. The exact terms vary by institution, so check the account agreement before opening. Some "no-penalty" CDs waive this fee but typically offer slightly lower rates in exchange.

How do I pick the right CD term?

Match the CD term to when you actually need the money. If you are saving for a vacation in 18 months, an 18-month CD makes sense. If the money is long-term and you want to maximise yield, a 3- or 5-year CD — or a ladder — is likely the better choice. Avoid locking up funds you might need for emergencies; those belong in a high-yield savings account instead.

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