CD (Certificate of Deposit) Calculator
Calculate the maturity value and interest earned on a certificate of deposit. Compare different CD terms and compounding frequencies to maximize your returns.
A certificate of deposit (CD) is a time-locked savings product offered by US banks and credit unions: you hand over a deposit for a fixed term — anywhere from three months to five years — and in exchange the bank pays you a guaranteed interest rate that is typically higher than a regular savings account. Our CD calculator shows you exactly what that deposit will be worth at maturity, how much interest you'll earn in dollars, and the effective APY once compounding is factored in.
CDs occupy a specific niche in the US personal-finance stack. They sit between a high-yield savings account (HYSA), which is fully liquid but variable-rate, and US Treasury bills, which are state-tax-exempt and backed by the federal government. A CD's main trade-off is liquidity: the money is locked in for the term, and pulling it out early usually triggers an early-withdrawal penalty of three to six months of interest (longer for multi-year CDs). In return, you get rate certainty — if you lock in 4.75% for five years and the Fed starts cutting, your yield is insulated.
One of the most powerful uses of this calculator is modeling a CD ladder: instead of depositing $50,000 into a single 5-year CD, you split it into five $10,000 rungs maturing at years one through five. Each year, one rung matures (giving you liquidity) and you roll it into a new 5-year CD at the top of the ladder. Over time, every rung is a 5-year CD but one matures annually. Whether you're parking an emergency-fund reserve, saving for a house down payment three years out, or building a retirement income ladder, this free tool is for educational use and does not constitute financial advice.
Quick answer: A $10,000 CD at 4.5% APR compounded monthly over a 12-month term matures at about $10,459 — $459 of earned interest, for an APY of roughly 4.59%. This CD calculator shows maturity value, interest earned, and APY across any deposit, rate, term, and compounding frequency you pick.
Inputs
Quick presetsTypical CD minimums run $500–$2,500; jumbo CDs start at $100,000 and often earn a small rate premium.
The stated annual rate before compounding. Compare CDs by APY (see output), not APR — APY is the apples-to-apples number.
Typical US CD terms are 3, 6, 12, 24, and 60 months. Shorter = more flexibility; longer usually pays more unless the yield curve inverts.
Most CDs compound monthly or daily. More frequent compounding raises APY slightly — check the bank's disclosure for specifics.
Results
How to use this calculator
Enter four inputs. **Deposit amount** is the lump sum you're committing — typical CDs have minimums of $500 to $2,500, though jumbo CDs start at $100,000 and often pay slightly higher rates. **Annual rate (APR)** is the advertised interest rate before compounding; current US CD rates vary widely by term and institution, so check a rate-comparison site for today's market. **Term length** is how long your money is locked in; shorter terms give flexibility, longer terms historically pay more (though the yield curve can invert).
**Compound frequency** is usually monthly for CDs but some banks compound daily or quarterly — check the disclosure. Hit Calculate and you'll see the maturity value (what the bank hands back at the end of the term), total interest earned in dollars, and the APY, which is the apples-to-apples number to compare against other CDs, HYSAs, and Treasury bills. Remember the FDIC insurance cap is $250,000 per depositor, per insured bank, per ownership category.
Worked examples
Marcus, building a 5-year CD ladder with $50,000
Marcus has $50,000 in cash reserves he won't need for five years. Instead of one 5-year CD, he splits it into five $10,000 rungs at 12, 24, 36, 48, and 60 months, each at roughly 4.5% APR compounded monthly. The 12-month rung matures at about $10,459; the 60-month rung at about $12,521. Starting year two, one rung matures annually and he rolls it into a new 5-year CD. After the ladder is fully seasoned, he always has liquidity every 12 months while capturing long-term rates.
Priya, parking a house down payment
Priya is buying a home in 18 months and has $40,000 earmarked for the down payment. She doesn't want stock-market risk but wants more than a checking account pays. Entering $40,000 at 4.75% APR for 18 months with monthly compounding, the calculator shows a maturity value of about $42,916 — roughly $2,916 in interest. She compares this to an HYSA at 4.25% (variable) and picks the CD for rate certainty, confident she won't need the cash before maturity.
Evelyn, retiree locking in a jumbo CD before rate cuts
Evelyn, 68, reads that the Fed is signaling rate cuts over the next year. She has $100,000 in an HYSA currently paying 4.8% variable. Worried her yield will fall as rates drop, she moves the cash into a 12-month jumbo CD at 5.3% APR compounded monthly. The calculator shows maturity at about $105,430 — roughly $5,430 in guaranteed interest, APY ~5.43%. Even if HYSA rates fall to 3.5% mid-year, her CD is locked. She sets a calendar reminder for the maturity date so the bank doesn't auto-renew her into a worse rate.
Frequently asked questions
What's the difference between APR and APY?
APR is the stated annual rate before compounding. APY includes compounding and is what you actually earn in a year. A 4.5% APR compounded monthly produces an APY of about 4.594%. Always compare CDs (and HYSAs) by APY, not APR — it's the apples-to-apples number.
How big are early-withdrawal penalties?
Typical US penalties are 3 months of interest for CDs under 12 months, 6 months for 1–3 year CDs, and up to 12 months for longer terms. Some banks offer 'no-penalty' CDs at slightly lower rates. If the penalty exceeds interest already earned, you can actually lose principal.
Is my CD FDIC insured?
Yes, CDs at FDIC-member banks are insured up to $250,000 per depositor, per insured bank, per ownership category. Credit unions offer NCUA insurance with the same $250,000 cap. To insure more, spread deposits across multiple banks or use different ownership categories (individual, joint, trust).
CD vs. high-yield savings account (HYSA)?
HYSAs are liquid and variable-rate; CDs are locked and fixed-rate. In a falling-rate environment, CDs protect your yield. In a rising-rate environment, HYSAs catch up faster. If you value flexibility, pick HYSA; if you value rate certainty on money you won't touch, pick a CD.
CD vs. Treasury bills?
T-bills are exempt from state and local income tax — meaningful if you live in California, New York, or another high-tax state. CDs are taxed at all levels. T-bills are backed by the US Treasury; CDs by FDIC insurance. Compare after-tax yields, not headline rates, before choosing.
What's a CD ladder?
A strategy where you split a lump sum across multiple CDs with staggered maturities (e.g., 1, 2, 3, 4, 5 years). Each year one matures, giving you liquidity, and you roll it into a new long-term CD. The ladder balances the higher rates of long-term CDs with annual access to some of the money.
Are CD rates taxable?
Yes — CD interest is taxed as ordinary income at the federal level (and usually state level) in the year it's credited, even if you don't withdraw it. Your bank will issue a 1099-INT. CDs held inside an IRA grow tax-deferred (Traditional) or tax-free (Roth).
What happens when a CD matures?
You typically get a 7–10 day grace period to withdraw, take the interest, or change the term. If you do nothing, most banks auto-renew into the same term at the current rate, which may be lower than your original rate. Set a calendar reminder — don't let the bank decide for you.