CD Interest Calculator

Use the compound interest formula: ending balance = deposit x (1 + rate / n)^{n x years}, where n is how many times a year interest compounds. If you have the APY instead, it is simpler: deposit x (1 + APY)^years. Subtract the deposit to get the interest. The calculator does either version for you.

The formula is A = P(1 + r/n)^nt. A is the ending balance, P is the deposit, r is the stated annual rate as a decimal, n is the number of compounding periods per year and t is the term in years. Interest earned is A minus P. When the quoted figure is APY, the formula reduces to A = P(1 + APY)^t.

It depends on the APY. After half a year, 10,000 dollars earns about $198 at 4.00% APY, about $223 at 4.50% and about $247 at 5.00%. The rule is 10,000 × ((1 + APY)^0.5 − 1). Enter 6 months and your own APY in the calculator to see the exact figure for your CD.

At 4.50% APY, 10,000 dollars earns exactly $450 in 12 months, because APY already includes compounding. At 4.00% it is $400 and at 5.00% it is $500. With a stated rate rather than an APY, daily compounding adds a little extra, as the compounding table above shows.

APR, the stated rate, ignores compounding within the year. APY includes it, so APY is equal to or higher than the stated rate. A 5.00% rate compounded daily has an APY of about 5.127%. Banks quote APY so offers can be compared on the same footing, and the federal rule that defines APY is part of Regulation DD.

The official formula is APY = 100 x [(1 + Interest / Principal)^{365 / Days in term} − 1]. Principal is the amount deposited, Interest is the total interest earned over the term and Days in term is the actual length. For a 365 day CD this simplifies to 100 x Interest / Principal. The calculator reports the APY for any term.

More frequent compounding pays slightly more at the same stated rate, but the gap is small. At 5.00% for a year on 10,000 dollars, daily compounding gives $10,512.67 and monthly gives $10,511.62, about a dollar apart. Compare APYs and the compounding frequency stops mattering, because APY already includes it.

If interest stays in the CD and compounds, you earn interest on interest, so the balance ends a little higher. If the bank pays interest out monthly to you, you get cash flow but nothing compounds inside the CD unless you reinvest the payments yourself. Enter the APY for compounding, and use the simple interest per month result for a payout view.

Divide months by 12. A 6 month CD is 0.5 years, a 9 month CD is 0.75 years and a 30 month CD is 2.5 years. The calculator accepts the term in months or years, and converts it for you, so a 18 month term is handled as 1.5 years in the formula.

If the CD has a 365 day term, the APY is 100 × 450 / 10,000 = 4.50%. For other terms the formula raises the growth to 365 divided by the days in term. Use the solve for rate mode: enter the deposit, target balance and term and the calculator returns the APY.

Divide the target balance by the deposit, raise that to the power 1 / years and subtract 1. To turn 10,000 dollars into 11,000 dollars in 2 years you need 1.1^1/2 − 1 = 4.88% APY. Choose the solve for rate mode in the calculator, enter the deposit, target and term, and read the APY.

Yes. Choose the APR option, enter the stated rate and select how often it compounds: daily, monthly, quarterly, semiannually or annually. The calculator applies (1 + r/n)^{n x years} and reports the APY that results. If your bank quotes APY, choose the APY option instead and no compounding choice is needed.

There is no single best term. Short terms keep your money available sooner and let you reprice when rates change. Longer terms lock in a rate for longer, which helps if rates fall and hurts if they rise. Match the term to when you will need the money, and consider a ladder to split the difference.

Until it matures if you can. Leaving early usually triggers an early withdrawal penalty, which federal law sets a minimum for but not a maximum. Choose a term that ends when you will need the money, so you collect the full interest and avoid a penalty.

Liquidity. Money in a CD is locked for the term, and an early withdrawal penalty can eat into the interest or even the deposit. Federal law sets a minimum penalty but no maximum. Other drawbacks are interest rate risk, since a fixed rate falls behind if rates rise, and inflation, which can reduce what the interest buys.

It is a charge for taking money out before maturity. Federal rules set a minimum: withdrawals in the first six days after deposit carry a penalty of at least seven days of simple interest. Beyond that the bank decides, often as a number of months of interest. Check your account agreement for the exact penalty.

It depends on the bank and the term. A common structure is a set number of days or months of interest, such as 90 days on a short CD. At a 4.00% stated rate on 10,000 dollars, 90 days of simple interest is about $98.63. The penalty table shows other balances. Your account agreement has the real figure.

Do not ignore the maturity date. Most CDs renew automatically into a new term at the rate offered at that time if you do nothing, and a withdrawal after renewal can be treated as an early withdrawal. Read the maturity notice, check the grace period in your account disclosure and decide before the window closes.

A grace period is a short window after maturity during which you can withdraw the money or change the CD without a penalty. Federal rules require the account disclosure to state whether the CD renews automatically and, if so, whether a grace period is offered and how long it lasts. Mark the date and act inside it.

A CD is a deposit, not an investment tied to the market, so its value does not fall with stocks. Deposit insurance protects up to $250,000 per depositor, per insured bank, per ownership category if the bank fails. The limit is applied bank by bank, and credit union CDs have the same standard limit through share insurance.

From a safety standpoint it is within the $250,000 insurance limit at one bank, so the deposit itself is protected. Whether it is wise depends on the rate, how soon you may need the cash and what else you could do with it. Use the calculator to see the interest at your rate and term.

The interest is a few thousand dollars a year, not a living. At 4.00% APY, 100,000 dollars earns $4,000 in a year, about $333 a month, before tax. The calculator shows the average monthly interest for any deposit, rate and term, so you can test your own numbers.

Interest on a CD is taxable income in the year it becomes available to you, and you report it on your federal return even if you do not receive a Form 1099-INT. Banks send Form 1099-INT when you receive $10 or more of interest. Enter your marginal tax rate in the calculator to see the interest after tax.

Enter your marginal rate, the rate on the next dollar of interest you earn. It depends on your filing status and income, and on any state income tax, so use the combined figure if you want to include state tax. Leave it at 0 to see pre-tax results.

The penalty can generally be claimed as an adjustment to income on your federal return, reported with the interest, rather than as an itemized deduction. The rules and the form lines are set out in the IRS guidance on interest income, so check the current instructions or ask a tax professional.

A CD ladder splits money across CDs with different maturity dates, such as 1, 2, 3 and 4 years. Each time the shortest rung matures you can spend it or reinvest it into a new longest rung. It gives regular access to part of the money while holding some longer term rates.

Up to $250,000 per depositor, per insured bank, for each ownership category. A joint account is insured separately from single accounts. To insure more than $250,000 you can use several banks or different ownership categories. The coverage table above gives the common cases.

It depends on what you need. A CD usually offers a fixed rate for the term in return for locking the money, while a savings account keeps the money available and its rate can change. Use the calculator for the CD side and compare it with the savings account's APY over the same period.

A standard CD keeps the rate it was opened at for the whole term, so the bank cannot raise or lower it midway. If market rates rise you stay at your lower rate until maturity, and if they fall you keep the higher one. That fixed rate is why CDs trade flexibility for certainty.

A callable CD lets the issuer redeem it before maturity, usually when rates have fallen, so you get your deposit and interest back early and must reinvest at lower rates. The higher starting rate compensates for that risk. This calculator assumes the CD runs the full term, so it does not model a call.

No. A CD holds a single deposit for the whole term, so the calculator takes one deposit. For regular contributions use the compound interest calculator, which models added deposits each period and shows APY against APR in the same way.

Enter the deposit, choose whether your rate is an APY or a stated rate, enter the rate, set the term in months or years and, if you like, a tax rate. Press Calculate to see the ending balance, interest earned, APY and after tax figures. Use the solve for rate option to work backward from a target balance.

It does not model early withdrawal penalties, interest paid out monthly, rate changes, callable features, fees or inflation. It assumes the deposit stays for the full term and all interest compounds. Real CDs differ, so use the account disclosure from your bank for the final numbers.

Compare the APY, then compare how long each locks your money. A higher APY on a longer term may beat a lower rate on a short one, but you give up access. Run each CD through the calculator with its own term and compare the interest earned and the ending balance for the same deposit.

Banks round daily interest, use 365 or 366 days, count actual days in the term and sometimes pay out interest instead of compounding it. The calculator uses exact formulas with the term as months divided by 12, so a real statement can differ by a few cents or dollars. Your bank's disclosure is the authority.

Often, but not always. Many CDs compound daily or monthly, and the account disclosure states the schedule. If your CD quotes an APY, the compounding is already included and you can use the APY option. If it quotes a stated rate, pick the matching compounding option for the APY and balance.

Divide the days by 365 to get years. A 90 day CD is 90 / 365 = 0.2466 years, which is close to 3 months. The official APY formula uses the actual days in the term, so for short CDs it is worth checking how your bank counts. The calculator accepts months, so use 3 months for a quarter of a year.