How much interest does a 6 month CD earn?

A 6 month CD earns roughly half of the listed APY before compounding effects. For example, a $10,000 CD at 5.00% APY for 6 months earns about $247 to $250 depending on the compounding method.

Does APY apply to CDs under one year?

Yes. APY is an annualized yield, so a CD with a term under one year earns a proportional amount for the actual term. A 3 month CD does not earn a full year of APY.

Which is better, a 3 month CD or a 6 month CD?

A 3 month CD gives faster access to cash, while a 6 month CD usually earns more total interest if the APY is similar. The better choice depends on when you need the money and whether rates are rising or falling.

Short-Term CD Calculator: 3, 6, 9 & 12 Month CD Returns

Short-Term CD Calculator

Use preset terms for 3, 6, 9, 12, 18, and 24 month CDs, or enter a custom term.

Short-Term Certificate of Deposit Calculator

Initial Deposit

Enter the amount you plan to place in the CD.

Annual Percentage Yield (APY)

%

Use the APY quoted by your bank or credit union.

Choose a Short-Term CD Length

Term Length in Months

months

Short-term CDs commonly run from 3 to 24 months.

Compounding Frequency

Monthly and daily compounding are common for bank CDs.

Maturity Value

$--

Estimated balance at term end

Interest Earned

$--

Before taxes and penalties

Term Return

--%

Return for selected months

Maturity Date

--

Estimated from today

APY note for short-term CDs

APY is annualized. A 6 month CD at 5.00% APY does not earn a full 5.00% in six months; it earns the portion of that annual yield that applies to the selected term.

Compare 3, 6, 9, 12, 18 and 24 Month CD Returns

See how maturity value changes when the same deposit and APY are applied to different short-term CD lengths.

Short-Term CD Comparison Table

CD Term	Maturity Value	Interest Earned	Term Return	Best Fit

This table uses the same deposit, APY, and compounding frequency from the calculator above.

When a Short-Term CD Calculator Is Useful

A short-term CD calculator helps when your decision is not simply “which CD has the highest APY?” but “how much will this CD earn before I need the money?” That difference matters for 3 month, 6 month, 9 month, and 12 month certificates of deposit because the advertised APY is annualized.

For example, a saver comparing a 3 month CD and a 6 month CD may find that the 6 month option earns more total interest, while the 3 month option keeps cash available sooner. If rates are rising, shorter terms can provide flexibility. If rates are falling, locking a 12 month CD may preserve a better yield for longer.

Short-Term CD Use Cases

Term	Common Goal	Tradeoff
3 month CD	Parking cash before a near-term purchase	Lower total interest but fast access
6 month CD	Balancing yield and flexibility	More interest than 3 months with moderate lockup
9 month CD	Capturing promotional CD rates	Less standard, so compare bank terms carefully
12 month CD	Locking a rate for a full year	Higher commitment but clearer annual comparison

How the Calculation Works

The calculator converts the quoted APY into a periodic rate based on your selected compounding frequency, applies it for the number of months in the term, then returns the estimated maturity value. This keeps the result focused on the actual CD term instead of overstating the return for CDs under one year.

For a monthly compounding CD, the calculator uses the same practical structure banks use for projections: principal grows by a periodic rate for each compounding period inside the term. A daily compounding CD applies smaller interest increments more often. The difference is usually modest for short terms, but it can still matter when the deposit is large or when two banks quote similar APYs.

For broader scenarios with ongoing deposits, use the CD calculator with monthly deposits. For a deeper compounding comparison, use the CD compound interest calculator.

Example: $10,000 Short-Term CD at 5.00% APY

Assume a $10,000 deposit, 5.00% APY, and monthly compounding. A 3 month CD earns roughly one quarter of a year of yield, while a 12 month CD earns the full annualized return. The exact result changes slightly with daily, monthly, quarterly, or simple interest treatment.

Term	Approximate Interest	What It Tells You
3 months	About $124	Useful when liquidity matters more than maximizing total dollars.
6 months	About $247	A common middle ground for savers waiting on rate changes.
9 months	About $372	Often used for promotional CDs with nonstandard terms.
12 months	About $512	Best for comparing a full-year CD against savings or Treasury alternatives.

How to Choose Between 3, 6, 9 and 12 Month CDs

Start with the date when you may need the money, then compare the extra interest earned by choosing the next longer term. If the extra interest is small, the shorter CD may be worth the flexibility. If the extra interest is meaningful and you are unlikely to withdraw early, the longer term can be a better fit.

Also compare early withdrawal penalties. A short-term CD can look attractive until a penalty removes one to three months of interest. For money that may be needed at any time, a high-yield savings account or money market account may be more practical even when the quoted APY is slightly lower.

Official References for CD Safety

Before opening a certificate of deposit, verify that the institution is insured and that your deposit stays within coverage limits. The FDIC explains deposit insurance for banks, while the NCUA explains share insurance for credit unions. For a general investor overview of certificates of deposit, see Investor.gov's guide to CDs.

Before Opening a Short-Term CD

Confirm whether the quoted rate is APY or APR.
Check the early withdrawal penalty before locking funds.
Compare the maturity date with your real cash need.
Verify FDIC or NCUA insurance limits when deposits are large.

Related Tools

Short-Term CD Calculator FAQ

Answers to common questions about 3 month, 6 month, 9 month, and 12 month CD calculations.

A 6 month CD earns the selected APY for half a year, adjusted for compounding. As a rough example, $10,000 at 5.00% APY for 6 months earns about $247 to $250 before taxes, depending on how the bank compounds interest.

Yes. APY is annualized, so it must be converted to the actual CD term. A 3 month CD at 5.00% APY does not earn 5.00% total; it earns the approximate three-month portion of that annual yield.

A 3 month CD can be useful when you need predictable access to cash soon and want more certainty than a variable-rate savings account. It may not be ideal if the early withdrawal penalty would erase most of the interest.

A 3 month CD is better for liquidity, while a 6 month CD usually earns more total interest at a similar APY. Compare both terms in the table above using your actual deposit amount and quoted APY.

Yes. The calculator estimates maturity value, interest earned, term return, and an approximate maturity date from today. Actual bank results can vary slightly because of daily balance methods, posting rules, and early withdrawal terms.