Use this CD ladder calculator to see what three fixed-rate CDs would pay at their original maturity dates. Enter each rung’s deposit, term in whole months, and assumed APY. It does not assume a maturing CD renews or predict future rates, and it cannot tell you whether your deposits are fully FDIC insured.
A CD ladder divides a starting deposit among CDs with different terms so that money becomes available at different times. The calculator shows each rung’s proceeds separately, because those receipts arrive on different dates.
CD ladder calculator
This calculator runs in your browser. This calculator’s code does not send, save, or track your entries. All dollar amounts are USD.
Optional example: Inputs start blank. Load example fills hypothetical figures without calculating. Examples are not current rates, quotes, or recommendations.
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What does the CD ladder calculator estimate?
Inputs start blank. The Load example figures put a hypothetical $5,000 in each rung at an assumed 4% APY, with maturities at 12, 24, and 36 months, the same as the worked example below. These are teaching assumptions, not available rates, product recommendations, or confirmation of insurance coverage.
All three rungs are assumed to open together. Terms can differ from the example and do not have to be entered in order: the results table sorts them by maturity while preserving each rung’s number.
“Month 12” means 12 months after the common opening date, not a specific calendar date. Match the actual maturity date in the bank’s agreement to the date you need the money.
Funds you need before the first maturity are not made available simply by splitting deposits into rungs. The estimate covers the initial ladder only, not what happens after each CD matures.
How much would a $15,000, three-rung ladder pay?
Inputs. In this hypothetical example, you place $5,000 into each of three CDs with terms of 12, 24, and 36 months, and assume all earn a fixed 4% APY. Interest remains in each CD until its original maturity.
Formula. Proceeds = principal × 1.04months ÷ 12. For the 24-month rung, $5,000 × 1.042 = $5,000 × 1.0816 = $5,408.
| Rung | Original maturity | Principal | Assumed APY | Interest to maturity | Proceeds at maturity |
|---|---|---|---|---|---|
| 1 | Month 12 | $5,000.00 | 4% | $200.00 | $5,200.00 |
| 2 | Month 24 | $5,000.00 | 4% | $408.00 | $5,408.00 |
| 3 | Month 36 | $5,000.00 | 4% | $624.32 | $5,624.32 |
Result. Starting principal is $15,000. Interest summed across these separate maturity dates is $200 + $408 + $624.32 = $1,232.32.
That is not one year’s interest, an annual yield, or the value of a portfolio at month 36. The $5,200 released at month 12 leaves the model then; the calculator does not assume that it sits idle, is spent, or earns another two years of interest.
What to check. For this reason, the results do not add the maturity proceeds into a headline “future portfolio value.” To estimate a value at one common future date, you would need extra assumptions about what happens to every earlier cash receipt. Also confirm that the real CDs pay a fixed rate and keep interest in the account until maturity.
Why doesn’t the calculator divide APY by 12?
Estimated proceeds = principal × (1 + APY ÷ 100)months ÷ 12. Estimated interest is those proceeds minus the starting principal. Each rung uses its own entered APY; a rate on one rung is not applied to the others.
APY already reflects compounding, so this formula does not divide APY by 12 and compound it again as though it were a nominal interest rate. For background on that distinction, see APY, APR, and interest rate.
The CFPB’s Regulation DD appendix says institutions calculate APY using the actual number of days in the account’s term. This calculator instead uses months divided by 12 as a planning approximation, so it does not reproduce a bank’s day count, crediting schedule, leap-year treatment, or rounding.
The model also assumes interest remains invested through maturity, with no withdrawals or added deposits. Regulation DD’s APY formula makes the same on-deposit assumption. A CD that pays interest out to another account may not show the displayed amount inside the CD at maturity, so check the product’s disclosures.
What should you decide when a rung matures?
| Structure or choice | Cash-access implication | What still needs checking |
|---|---|---|
| Three staggered original terms | Different portions mature at different times | Whether each date fits the planned expense |
| Three CDs with the same term | All may mature together | Splitting accounts alone does not stagger access or multiply insurance |
| Renew a matured rung | Commits that receipt to another term | Future rate, term, grace period, and cash needs; none are forecast here |
| Withdraw before maturity | May release funds earlier if permitted | Penalty, restrictions, and actual proceeds; this tool assumes no early exit |
FDIC consumer guidance suggests finding out whether a CD renews automatically at maturity and, if so, whether the renewal uses the old rate or the current rate. It also suggests checking whether you can redeem early and whether the bank can call the CD.
If you are still deciding between a CD and a high-yield savings account for one target date, rather than building a ladder, see HYSA versus CD for a savings goal.
Do three CDs mean three insurance limits?
No, not automatically. The standard FDIC insurance amount is $250,000 per depositor, per insured bank, per ownership category. A CD is a deposit type, not its own ownership category, and the limit includes principal and accrued interest.
For example, opening three single-owner CDs at one bank does not by itself provide three separate $250,000 limits. Existing checking and savings balances in that same category at that bank also count.
The calculator has no bank, ownership, beneficiary, or other-account inputs, so it cannot determine whether your deposits are fully covered. Verify the issuing bank’s insured status and review the full arrangement with the FDIC’s Electronic Deposit Insurance Estimator.
Do not assume a bank-sounding name, brokerage platform, or advertised “CD” alone proves that funds are an insured deposit. The FDIC notes that if a third-party broker fails to place your funds in a CD at an FDIC-insured bank, the money will not be FDIC insured.
When this CD ladder model doesn’t fit
- You need cash before the first maturity. The model assumes no early withdrawal and does not calculate penalties.
- The CD is callable, market-linked, variable-rate, or brokered. These can have features this simple fixed-rate model does not capture, such as a bank’s right to close the account early.
- Interest is paid out rather than kept in the CD. The displayed proceeds assume interest stays on deposit until maturity.
- You want a rollover or after-tax forecast. The tool excludes renewals, future rates, taxes, fees, inflation, and the return on money outside the three original rungs.
How the calculator handles inputs and rounding
Use zero principal to leave a rung unfunded. It still appears in the table, but it does not determine the first or last funded maturity.
Two funded rungs with the same term mature together; they do not provide two distinct access dates. The tool flags that rather than treating every three-CD arrangement as evenly staggered.
Totals use unrounded calculations. Displayed amounts are rounded to cents, so individual rows may not add exactly to a displayed total.
Quick decision checklist
- Write down the date you need each portion of the money and match it to an actual maturity date.
- Confirm each CD’s rate is fixed and whether interest stays in the CD or is paid out.
- Read the automatic-renewal, grace-period, and early-withdrawal terms before opening each rung.
- Add up all deposits in the same ownership category at each bank and check coverage with the FDIC’s estimator.
- Decide in advance what you will do with each rung when it matures, since the calculator does not forecast renewals.
Sources and calculation review
- CFPB: Appendix A to Part 1030, Annual Percentage Yield Calculation, actual-day APY calculation and the assumption that principal and interest remain on deposit.
- FDIC: Shopping for a Certificate of Deposit?, verifying insured deposits, brokered CDs, accrued-interest coverage, renewal, early redemption, and callable CDs.
- FDIC EDIE glossary, standard insurance amount and the distinction between deposit types and ownership categories.
Official-source material checked September 28, 2026. The worked example was recalculated independently. Educational estimates only, not individualized financial advice or an insurance determination.
Prepared with AI-assisted research, drafting, and calculation checks. Not independently reviewed by a human financial professional.
