A CD calculator estimates how much interest your deposit will earn over a set term. Enter your initial deposit, term length, interest rate, and compounding frequency. The calculator returns your total interest earned and final balance at maturity.
A certificate of deposit (CD) locks your money at a fixed rate for a specific period. Because the rate is guaranteed, a CD calculator can give you a reliable projection of your earnings before you commit funds. Use this free CD calculator to compare deposit amounts, terms, and APYs side by side.
Use This Calculator to Calculate CD Interest Earned
To calculate CD interest earned, you need four inputs:
- Initial deposit — the lump sum you plan to deposit.
- Term length — how long the CD lasts (months or years).
- CD rate / APY — the annual percentage yield offered by the bank or credit union.
- Compounding frequency — how often interest is compounded (daily, monthly, quarterly, or annually).
Enter those values and the calculator returns your total interest earned, plus the balance you will have when the CD matures.
How do I calculate how much money my CD will make?
Use the compound interest formula to find the future value A of your certificate of deposit (CD):
A = P × (1 + r/n)^(n × t)
Explanation of each term:
- P = initial deposit (principal)
- r = annual interest rate as a decimal (for 2.5% use 0.025)
- n = number of times interest is compounded per year (common values: 1 yearly, 4 quarterly, 12 monthly, 365 daily)
- t = term length in years
Step-by-step use (or enter these values into the CD calculator above):
- Convert the interest rate to a decimal.
- Choose the correct compounding frequency for your CD.
- Raise (1 + r/n) to the power of n×t.
- Multiply that result by P to get the account value A at maturity.
- Subtract P from A to find total interest earned.
Quick example: Deposit $10,000 at 2.5% annual interest compounded monthly for 3 years.
r = 0.025, n = 12, t = 3 so A = 10000 × (1 + 0.025/12)^(12×3) ≈ 10000 × (1.0020833)^(36) ≈ $10,769.66. Interest earned ≈ $10,769.66 − $10,000 = $769.66.
Notes and tips:
- If your CD quote gives APY instead of the nominal rate, you can use the APY directly to estimate annual growth: A ≈ P × (1 + APY)^t (APY already accounts for compounding).
- Longer terms and more frequent compounding increase total interest, but compare rates and early withdrawal penalties when choosing a CD.
How much will $10,000 make in a 6 month CD? At a 4.50% APY compounded daily, $10,000 earns roughly $225 in six months. Your exact amount depends on the rate and compounding method your financial institution uses.
How much will a $100,000 CD make in one year? At 4.50% APY compounded daily, a one-year CD on $100,000 earns approximately $4,602. Adjust the rate in the calculator to match actual offers you are considering.
How much does a $20,000 CD make in a year? At 4.50% APY, roughly $920 in earned interest after 12 months. Higher APYs or longer terms increase that number.
How Much Interest Does a Certificate of Deposit Earn
The amount of interest earned depends on three factors working together: how much you deposit, how long you leave it, and the rate the institution pays. A larger deposit at a higher rate for a longer term produces the most accumulated interest.
Initial Deposit and Term Length
Your initial deposit is the money you lock in on day one. Most banks set a minimum deposit, often $500 or $1,000, though some require more for premium rates.
Term length is the period you agree to leave funds untouched. Common terms include:
- Short term — 3 months, 6 months
- Mid term — one-year CD, 18 months
- Long term — 3-year CD, five-year CD
Longer terms historically offer higher rates because you give the bank use of your money for more time. However, shorter terms give you flexibility to reinvest if rates rise.
What term length should you get? That depends on when you need the money and where you think rates are headed. If you want access within a year, a 6 or 12 month term keeps your funds liquid sooner. If you are saving toward a goal several years out and want a guaranteed rate of return, a long-term CD locks in today's rate.
A CD ladder spreads deposits across multiple terms (for example, one-year, two-year, and three-year CDs). As each CD matures, you reinvest or use the funds. This balances higher returns on longer terms with periodic access to your money.
CD Rate, APY, and Compound Interest
The CD rate is the nominal annual interest rate. APY (annual percentage yield) reflects compound interest, showing the actual rate of return you earn in a year after compounding is factored in.
What is compound interest? It means you earn interest on your interest. If interest is compounded daily, each day's small interest amount gets added to your balance, and the next day's interest is calculated on that slightly larger number. Over a full term, compounding daily produces a bit more than compounding monthly or quarterly.
What is APY? APY standardizes comparison across different compounding frequencies. Two CDs with the same nominal rate but different compounding schedules will have different APYs. Always compare APYs when shopping for new CDs.
How much interest will I earn on a CD? The answer varies by rate environment. Plug your specific deposit amount and the APY you have been quoted into the calculator to find your projected earnings.
CD Savings vs. Savings Account
CDs and traditional savings accounts both protect your money, but they work differently.
| Feature | Certificate of Deposit | Savings Account |
|---|---|---|
| Rate | Fixed for the full term | Variable, can change anytime |
| Access | Locked until maturity date | Withdraw anytime |
| Returns | Generally higher APY | Generally lower APY |
| Risk | Charged a penalty for early withdrawal | No withdrawal penalty |
Are CDs worth it? When you have money you will not need for a set period, a CD often delivers higher returns than a savings account because you accept limited access in exchange for a guaranteed rate. If you might need funds on short notice, a high-yield savings account offers more flexibility, even if the APY is lower.
Are CDs FDIC insured? Yes. CDs at FDIC member banks are insured up to $250,000 per depositor, per institution. Credit union CDs (sometimes called share certificates) carry equivalent NCUA insurance. Your principal and earned interest are protected up to those limits.
Are CDs worth it in 2026? That depends on current APYs relative to inflation and your individual circumstances. Compare today's CD rates to savings account rates and other deposit accounts. If a fixed rate CD pays meaningfully more, locking in that rate can make sense for money tied to a specific savings goal.
How CDs Mature and Early Withdrawal
A CD matures on its maturity date, the day the term ends. At maturity, you typically have a grace period (often 7 to 10 days) to:
- Withdraw your principal plus all interest earned
- Roll the balance into a new CD at the current rate
- Let the bank auto-renew into a new CD at the prevailing rate
If you do nothing, most financial institutions automatically renew the CD. The new CD may have a different rate, so check before the grace period closes.
What happens if you withdraw early? Most banks charge an early withdrawal penalty. The penalty is usually a set number of months' worth of interest. For example:
- A one-year CD might charge 3 months of interest.
- A five-year CD might charge 6 months or more.
An early withdrawal penalty can eat into or even exceed your earned interest, especially if you pull funds soon after opening the CD. Factor this into your decision before you deposit money.
What should I know when choosing CDs? Consider these points:
- Compare APYs across banks and credit unions for the term you want.
- Check the minimum deposit requirement.
- Read the early withdrawal penalty terms.
- Confirm the institution is FDIC or NCUA insured.
- Decide whether a CD ladder fits your personal finance goals.
CD Rates and Annual Percentage Yield (APY)
CD rates are the interest rates banks advertise for each term. They vary by institution, term length, and current market conditions. A 10 year CD rate may be higher or lower than shorter term rates depending on the interest rate environment.
How Banks Set 10 Year CD Rates
Banks set CD rates based on several factors:
- Federal funds rate. When the Federal Reserve raises or lowers rates, banks adjust deposit rates.
- Term length. Longer terms sometimes offer higher rates because your money is committed longer. In an inverted yield environment, shorter CDs may actually pay more.
- Competition. Online banks often offer higher rates than traditional brick-and-mortar institutions because they have lower overhead.
- Deposit amount. Some banks offer higher APYs for larger deposits or have minimum deposit requirements.
Where are CD rates headed in 2026? Rate direction depends on Federal Reserve policy and inflation trends. No one can predict future rates with certainty. Locking in a 10 year CD secures today's rate regardless of what happens next.
APY vs. Interest Rate on a Certificate of Deposit
These two numbers look similar but mean different things.
- Interest rate. The base rate the bank pays on your deposit, without accounting for compounding.
- Annual percentage yield (APY). The effective annual return after compounding is factored in. APY is always equal to or slightly higher than the stated interest rate.
APY provides a standardized way to compare different CDs, even when they use different compounding frequencies. When comparing CD rates across banks, always compare APYs.
CD Savings Over 10 Years With Compound Interest
Watching your CD grow year by year shows why the 10 year term is powerful. Here is a sample growth schedule for a $10,000 deposit at 4.00% APY compounded daily:
| Year | Balance (approx.) |
|---|---|
| 1 | $10,408 |
| 2 | $10,833 |
| 3 | $11,275 |
| 4 | $11,735 |
| 5 | $12,214 |
| 6 | $12,712 |
| 7 | $13,231 |
| 8 | $13,771 |
| 9 | $14,333 |
| 10 | $14,918 |
The interest earned accelerates each year because you earn interest on a larger and larger balance. By year 10, the annual interest is noticeably bigger than in year 1.
Certificate of Deposit Rates for 6 Month CDs
The CD rate you lock in determines how much interest you'll earn. Rates vary widely depending on where you open a CD and market conditions at the time.
Comparing CD Rates at Banks and Credit Unions
Not all financial institutions offer the same rates. Online banks and credit unions frequently pay higher CD rates than large national banks because their overhead costs are lower.
When comparing, focus on APY rather than the base interest rate. APY tells you the true annual return after compounding. A few tips for comparing:
- Check both online banks and local credit unions for the best CD rates.
- Note the minimum deposit required. Some high-yield CDs need $500 or more to open.
- Confirm the term matches. A 6 month CD is not the same as a 3 month or 1 year CD.
Rates are subject to change daily, so verify the current rate with the institution before you deposit money.
High-Yield CDs vs. Savings Account Rates
High-yield CDs often pay more than traditional savings accounts, especially for short terms like six months. The tradeoff is that your money is locked until the maturity date.
A high-yield savings account lets you withdraw anytime, but the APY may change without notice. A 6 month CD gives you a fixed rate, a guaranteed rate of return for the full term.
If you know you won't need the money for six months, a CD typically earns more. If you need flexible access, a high-yield savings account may be the better fit.
Calculating Your Final Balance on a 6 Month Certificate of Deposit
Your final balance is your initial deposit plus all interest earned over the 6 month term. The calculator estimates this using the compound interest formula.
How Your Initial Deposit Grows Over 6 Months
Here's a quick look at estimated earnings on common deposit amounts at a 4.50% APY for a 6 month CD:
| Initial Deposit | Estimated Interest Earned | Final Balance |
|---|---|---|
| $1,000 | ~$22.25 | ~$1,022.25 |
| $5,000 | ~$111.25 | ~$5,111.25 |
| $10,000 | ~$222.50 | ~$10,222.50 |
| $25,000 | ~$556.25 | ~$25,556.25 |
These are estimates based on a fixed APY over six months. Your actual earnings depend on the specific CD rate and compounding frequency your bank or credit union offers.
How much will $10,000 make in a 6 month CD? At a 4.50% APY, roughly $222. At 5.00% APY, roughly $247. Enter your exact rate in the calculator above for a personalized estimate.
APY vs. Interest Rate on a Certificate of Deposit
The stated interest rate is the base rate the bank uses to calculate your earnings. APY is the effective annual rate after compounding is factored in.
On a 6 month CD, the difference between the two is small. But APY is always slightly higher than the stated rate (unless compounding is annual). Use APY when comparing CDs across different financial institutions because it standardizes the comparison.
What's the difference in practice? A CD with a 4.90% interest rate compounded daily has an APY of about 5.02%. The calculator accounts for this when you enter the correct inputs.
How CD Interest and Compound Interest Affect What You Earn on a CD
CD interest grows because banks pay you interest on your original deposit, and then pay interest on the interest you have already earned. That second layer is compound interest, and it is the reason your final balance exceeds a simple interest calculation.
The compound interest formula multiplies your deposit by (1 + rate/n) raised to the power of (n × t), where n is the number of compounding periods per year and t is the number of years. You do not need to memorize this. The calculator handles it automatically.
APY vs. Interest Rate on a Certificate of Deposit
The nominal interest rate is the base rate the bank quotes. APY (annual percentage yield) folds in compounding so you can compare CDs on equal footing.
Two CDs could advertise the same nominal rate but deliver different earnings if one compounds daily and the other compounds quarterly. APY removes that confusion. When comparing CD rates from different banks, always compare APYs. That single number tells you the true amount of interest earned over one year.
How Compounding Frequency Changes CD Interest
Compounding frequency is how often the bank credits interest to your balance. Common options:
- Daily compounding: interest is calculated every day.
- Monthly compounding: interest is credited once per month.
- Quarterly compounding: four times per year.
- Annually compounding: once per year.
More frequent compounding means slightly more accumulated interest by maturity. On a $10,000 one-year CD at 5.00%:
- Annual compounding earns $500.00
- Monthly compounding earns about $511.62
- Daily compounding earns about $512.67
The differences are modest on a one-year term but become more noticeable with larger deposits or longer terms. Try different compounding frequencies in the calculator to see the impact on your CD earnings.
Current CD Rates and What They Mean for Your Deposit
CD rates change with the broader interest rate environment. When the Federal Reserve raises or lowers its benchmark rate, banks typically adjust the APYs they offer on new CDs.
As of mid-2025, competitive one-year CD rates from online banks range roughly from 4.00% to 5.00% APY. Traditional brick-and-mortar banks often offer lower rates. Shopping around matters. Even a 0.50% difference on a $25,000 deposit adds about $125 in extra interest over one year.
A few things to keep in mind about current CD rates:
- Online banks and credit unions tend to post higher APYs than large national banks.
- Promotional rates sometimes require a higher minimum deposit.
- The rate you lock in at opening is fixed for the entire term. That is both the appeal and the risk of a CD.
Use this calculator to estimate your certificate of deposit earnings at several different interest rates before you commit.
How the CD Calculator Estimates Your Interest
The calculator uses your deposit, APY, and term to project earnings. It applies the compounding formula behind the scenes so you don't need to do the math by hand.
Annual Percentage Yield and How Interest Rates Compound
APY already accounts for how often interest is compounded. That's what makes it useful for comparing different CDs with different compounding frequencies.
Banks may compound interest daily, monthly, or quarterly. Daily compounding produces slightly more earned interest than monthly compounding at the same nominal rate. The APY standardizes this so you see a true apples-to-apples number.
When you enter the APY into this calculator, the tool uses it to estimate your total balance at maturity.
How Much Interest a 3 Month Certificate of Deposit Earns
How much would a 3 month CD pay? It depends on your deposit and rate.
Here are a few quick examples:
| Deposit | APY | Estimated Interest (3 months) |
|---|---|---|
| $1,000 | 4.50% | ~$11.17 |
| $5,000 | 4.50% | ~$55.84 |
| $10,000 | 4.50% | ~$111.68 |
| $10,000 | 5.00% | ~$124.22 |
| $25,000 | 4.50% | ~$279.21 |
These figures assume daily compounding. Your bank's actual terms may produce slightly different results. Use the calculator above with your specific numbers for a personalized estimate.
A $10,000 deposit at 4.50% APY earns roughly $112 in three months. Not life-changing, but it's a risk-free return on money you'd otherwise leave sitting idle.
Current 3 Month CD Rates
CD rates change frequently. As of mid-2025, competitive 3 month CD rates generally fall between 4.00% and 5.00% APY, depending on the institution.
Check your bank's current rate before committing. Online banks and credit unions tend to offer higher APYs than large national banks.
High-Yield CD Rates vs. Traditional Bank Rates
High-yield CDs from online banks often pay significantly more than traditional bank CDs. The difference can be a full percentage point or more.
Traditional banks may offer 3 month CDs at 2.00% to 3.50% APY. Online banks and some credit unions frequently offer 4.25% to 5.00% APY for the same term. That gap makes a real difference in your earnings, especially on larger deposit amounts.
Shopping around is worth the effort. A few minutes of comparison can add meaningfully to your return.
How the Federal Reserve Affects CD Rates
The Federal Reserve sets the federal funds rate, which influences what banks pay on deposit accounts. When the Fed raises rates, CD rates tend to climb. When it cuts rates, CD APYs typically follow downward.
Where are CD rates headed in 2026? Nobody knows for certain. Rate forecasts depend on inflation, employment data, and Fed policy decisions. If you expect rates to drop soon, locking in a current rate with a 3 month CD lets you secure today's yield while keeping your options open for reinvestment shortly.
A 3 month term is short enough that you're never far from being able to adjust if rates move in either direction.
Certificate of Deposit Calculator Inputs: Deposit, CD Rates, and Compound Interest
Every CD calculator needs three core inputs.
- Deposit amount. The lump sum you deposit when you open a CD. Some banks have minimum deposit requirements (often $500 or $1,000). This calculator works with any amount.
- Interest rate or APY. The annual percentage yield is the effective yearly return after compounding is factored in. APY lets you compare offers from different banks on equal footing. If a bank quotes a nominal rate instead of APY, this tool accounts for the compounding effect.
- Compounding frequency. How often interest is compounded changes the amount of interest earned. Daily compounding produces slightly more than monthly, which produces more than annual. Most CDs compound daily or monthly.
A fixed rate means the rate will not change for the entire 4 year term. That predictability is one of the main reasons people choose CDs over variable-rate deposit accounts.
Early Withdrawal Penalty on a Certificate of Deposit
When you open a CD, you agree to leave your deposit untouched until the maturity date. If you pull money out before the CD matures, the bank charges an early withdrawal penalty.
Penalties vary by institution and term length. Common structures include:
- A set number of months of interest (often 6 to 12 months for a 4 year CD)
- A flat percentage of the withdrawn amount
- Loss of all interest earned, in rare cases
Some banks calculate the penalty on the amount withdrawn, not the full balance. Others apply it to the entire CD. Read the disclosure before you open a CD.
How Early Withdrawal Affects Your CD Interest Earnings
An early withdrawal penalty can erase a significant portion of your interest earned, especially if you withdraw in the first year or two.
For example, if your 4 year CD charges a penalty of 12 months of interest and you withdraw after 18 months, you'd lose two-thirds of the interest you've accumulated up to that point. In some scenarios, the penalty can even dip into your original deposit.
Before committing to a 4 year term, make sure you have a separate emergency fund in a liquid account. Only deposit money you're confident you won't need until the CD matures.
Estimate How Your Savings Grow With a 5 Year Certificate of Deposit
A 5 year certificate of deposit gives compound interest time to work. The longer your money stays deposited, the more interest stacks on top of previous interest.
Compound Interest and Annual Percentage Yield on a CD
Compound interest means you earn interest on your interest, not just on your original deposit. Most banks compound CD interest daily or monthly.
Here is a quick example. A $10,000 CD at 4.50% APY compounded daily would earn roughly $2,492 over five years, bringing your total to about $12,492. The same deposit at 4.00% APY would earn approximately $2,190.
The difference between compounding frequencies (daily vs. monthly vs. quarterly) is small on a single CD. But APY already accounts for that difference, which is why comparing APY across banks gives you the clearest picture.
CD Earnings vs. a Savings Account
A high-yield savings account offers flexibility. You can withdraw anytime. But the interest rate can change without notice.
A 5 year CD locks in a fixed interest rate for the entire term. If rates drop after you open a CD, you keep earning the original rate. The tradeoff is limited access to your money.
When current rates are high, locking in with a longer-term CD can protect your earnings against future rate cuts. When rates are rising, shorter terms or a CD ladder (splitting your money across multiple CDs with different maturity dates) may give you more flexibility.
5 Year CD Calculator vs. Certificate of Deposit Calculator for Other Terms
This page is optimized for a 5 year term, but the calculator works for any CD term length. You can adjust the time period to compare different scenarios.
Here is how a $10,000 deposit at 4.25% APY looks across several terms:
| Term | Interest Earned | Maturity Value |
|---|---|---|
| 1 year | ~$434 | ~$10,434 |
| 2 years | ~$886 | ~$10,886 |
| 3 years | ~$1,356 | ~$11,356 |
| 5 years | ~$2,339 | ~$12,339 |
Longer-term CDs lock in your rate for more time, which earns more total interest. But they also tie up your money longer. A CD ladder, where you split your deposit across a 1 year, 2 year, 3 year, and 5 year CD, gives you a balance of higher rates and periodic access to your savings.
Whether a 5 year CD is right for you depends on your savings goals, your timeline, and whether you are comfortable not touching the money until maturity.
Certificate of Deposit Calculator Results Are for Illustrative Purposes
This free CD calculator provides hypothetical projections based on the inputs you enter. Results are for illustrative purposes only and do not represent an offer, guarantee, or commitment from any financial institution.
Actual CD earnings depend on the specific rate, compounding method, and terms set by your bank or credit union. Interest rates, APYs, and minimum deposit requirements vary by institution and can change without notice.
This calculator is a planning aid. It is not financial advice. Before opening a CD, confirm the exact terms with your chosen institution and consider how the commitment fits your individual circumstances and savings goals.