CD Calculator
Estimate your certificate of deposit maturity value, interest earned, and effective yield.
Results
What is a CD Calculator?
A CD calculator projects the future value of a certificate of deposit based on your deposit amount, APY, term, and compounding frequency. Instead of guessing what a bank's advertised rate will actually pay, you can see the exact dollar amount waiting for you at maturity — and how much more a CD earns than leaving the same money in a regular savings account.
A certificate of deposit is a time deposit: you agree to lock up your money for a fixed term, commonly anywhere from 3 months to 5 years, and in exchange the bank pays a fixed rate that is usually higher than a standard savings account. Because the rate never changes during the term, a CD's growth is completely predictable.
How to Use This Calculator
- Enter the amount you plan to deposit.
- Input the annual percentage yield (APY) offered by your bank.
- Enter the CD term in months.
- Select how often interest compounds.
- Click Calculate to see maturity value, interest earned, and a savings comparison.
CD Growth Formula
When a yield is quoted as APY, certificate of deposit growth follows a simple exponential formula:
FV = P × (1 + APY)^t
- FV — future value (maturity value) of the CD
- P — principal, your initial deposit
- APY — annual percentage yield, written as a decimal (4.75% becomes 0.0475)
- t — time in years (a 6-month term is t = 0.5)
Crucially, APY already includes compounding — unlike APR or a nominal rate, which must be compounded per period to reveal the true yield. A bank quoting a 4.65% nominal rate compounded monthly is really offering an APY of about 4.75%. That is why this calculator's maturity value is identical whether you select monthly, quarterly, or daily compounding: the tool converts your APY into the equivalent nominal rate for the chosen frequency, and the growth lands on the same number every time. To work with nominal rates directly, try the APR calculator or the compound interest calculator.
Worked Examples
Example 1: $10,000 at 4.75% APY for 12 months
FV = 10,000 × (1.0475)^1 = $10,475.00, so you earn $475.00 in interest. Over the same year, a 1% savings account would grow to only $10,100.46 — the CD pays $374.54 more.
Example 2: $25,000 at 4.5% APY for 5 years
FV = 25,000 × (1.045)^5 = $31,154.55. Total interest is $6,154.55 — nearly a quarter of the original deposit — with zero market risk along the way.
CD Maturity Reference Table
Maturity values for a $10,000 deposit at common APYs and terms, computed with FV = P × (1 + APY)^t:
| APY | 6 Months | 1 Year | 2 Years | 3 Years | 5 Years |
|---|---|---|---|---|---|
| 3.5% | $10,173.49 | $10,350.00 | $10,712.25 | $11,087.18 | $11,876.86 |
| 4.0% | $10,198.04 | $10,400.00 | $10,816.00 | $11,248.64 | $12,166.53 |
| 4.5% | $10,222.52 | $10,450.00 | $10,920.25 | $11,411.66 | $12,461.82 |
| 5.0% | $10,246.95 | $10,500.00 | $11,025.00 | $11,576.25 | $12,762.82 |
| 5.5% | $10,271.32 | $10,550.00 | $11,130.25 | $11,742.41 | $13,069.60 |
Early Withdrawal Penalties
A CD's rate is guaranteed only if you hold it to maturity. Cash out early and most banks charge an early withdrawal penalty, typically 3 to 12 months of interest depending on the term — around 3 months for terms under a year, 6 months for 1- to 3-year terms, and up to 12 months for longer terms. On a $10,000 CD at 4.75% APY, a 6-month penalty costs about $234.74, erasing half a year of earnings; withdraw before you have earned that much and some banks will dip into your principal. If there is any chance you will need the money sooner, pick a shorter term, a no-penalty CD, or a ladder instead.
Building a CD Ladder
A CD ladder divides your savings across several CDs with staggered maturities, so you capture long-term rates without locking up everything at once. Here is a $15,000 ladder split into three $5,000 rungs:
- 1-year CD at 4.00% APY → matures at $5,200.00 ($200.00 interest)
- 2-year CD at 4.25% APY → matures at $5,434.03 ($434.03 interest)
- 3-year CD at 4.50% APY → matures at $5,705.83 ($705.83 interest)
Total interest across the ladder is $1,339.86. When the 1-year rung matures, reinvest it in a new 3-year CD and repeat each year; eventually every rung earns the higher 3-year rate, yet one CD still matures every 12 months, keeping cash within reach.
No-Penalty CDs
A no-penalty (or liquid) CD lets you withdraw the full balance before maturity without forfeiting interest, usually after a brief lock period of about a week. The trade-off is a slightly lower APY than a traditional CD of the same term. No-penalty CDs shine when rates are expected to rise or when you want a yield floor for an emergency fund you might need on short notice — before committing, compare the offer against a high-yield savings account with our savings calculator.
FDIC and NCUA Insurance
CDs at FDIC-insured banks are protected up to $250,000 per depositor, per insured institution, per ownership category; credit union share certificates carry the same $250,000 of coverage through the NCUA. If your balance exceeds the limit, you can stay fully insured by spreading deposits across multiple banks or ownership categories. For growth projections that involve market risk, use the investment calculator.
Frequently Asked Questions
What is APY?
Annual Percentage Yield reflects the actual rate of return after accounting for compounding. Unlike the nominal rate, APY tells you how much you really earn in a year.
How is CD interest calculated?
CD growth follows FV = P × (1 + APY)^t, where P is your deposit, APY is the annual percentage yield as a decimal, and t is the term in years. Because APY already includes compounding, $10,000 at 4.75% APY grows to exactly $10,475.00 after one year.
Are CD earnings taxable?
Yes, interest earned on CDs is generally taxable as ordinary income in the year it is credited, even if you do not withdraw it.
What happens if I withdraw early?
Most CDs charge an early withdrawal penalty, typically 3 to 12 months of interest depending on the term. A 6-month interest penalty on a $10,000 CD at 4.75% APY costs about $234.74. Check your bank's terms before opening a CD.
How does compounding frequency affect returns?
More frequent compounding yields slightly more interest. However, the APY already incorporates compounding, so the difference between monthly and daily is usually small.
Are CDs insured?
Yes. CDs at FDIC-insured banks are protected up to $250,000 per depositor, per insured institution, per ownership category. Credit union share certificates carry equivalent $250,000 coverage through the NCUA.
What is a CD ladder?
A CD ladder splits your money across several CDs with staggered maturities, such as 1-year, 2-year, and 3-year terms. As each rung matures, you reinvest at the longest term, giving you regular access to cash while capturing higher long-term rates.
What is a no-penalty CD?
A no-penalty CD lets you withdraw your full balance before maturity without forfeiting interest, usually after a short initial lock period. The trade-off is a slightly lower APY than a comparable traditional CD.