CD Ladder Calculator
Enter your total investment, choose how many rungs you want, and set each CD's APY to see exactly what a CD ladder will earn — total interest, total value at maturity, your blended APY, and when each rung matures. Compare it instantly against putting the whole amount in a single CD.
Quick examples:
The amount you'll spread across the ladder's rungs
2–10 CDs
Years between maturities
Illustrative rates — enter your own. Longer rungs usually pay more.
Ladder Summary
Total Interest Earned
Total Value at Maturity
Blended APY
Rungs & Span
Total Deposits
Ladder vs. Single CD
What the same lump sum would earn in one CD held for the longest term (5 years). Your ladder typically lands between these while giving you earlier access to cash.
Single CD @ Shortest APY
Single CD @ Longest APY
Maturity Timeline
(5 rungs)When each rung matures and for how much
Per-Rung Breakdown
| Rung | Term | Deposit | APY | Interest | Maturity | Matures |
|---|---|---|---|---|---|---|
| 1 | 1 yr | $5,000.00 | 4.50% | $225.00 | $5,225.00 | in 1 year |
| 2 | 2 yrs | $5,000.00 | 4.55% | $465.35 | $5,465.35 | in 2 years |
| 3 | 3 yrs | $5,000.00 | 4.60% | $722.23 | $5,722.23 | in 3 years |
| 4 | 4 yrs | $5,000.00 | 4.65% | $996.90 | $5,996.90 | in 4 years |
| 5 | 5 yrs | $5,000.00 | 4.70% | $1,290.76 | $6,290.76 | in 5 years |
| Total | $25,000.00 | 4.60% | $3,700.24 | $28,700.24 |
The footer APY is the principal-weighted blended yield. Maturity values sum to your total value at maturity.
Related Calculators
How This Calculator Works
A CD ladder spreads a lump sum across several certificates of deposit with staggered maturities, called rungs. One CD matures every interval for liquidity, while the longer rungs capture the higher yields that long-term CDs typically pay. This calculator allocates your money across the rungs, grows each one with compound interest, and rolls everything up into a total value, a total interest figure, and a single blended APY — plus a per-rung table and a maturity timeline. For a single deposit instead of a ladder, see our CD Calculator.
Per-Rung Maturity Value
Aᵢ = Pᵢ(1 + APYᵢ)^tᵢ
Each rung is a single fixed-rate CD. Pᵢ is the amount in rung i, APYᵢ is its annual yield (as a decimal), and tᵢ is its term in years (rung i = i × the ladder interval). The result Aᵢ is that rung's value at maturity.
Ladder Totals & Blended APY
Total value = Σ Aᵢ
Blended APY = Σ(Pᵢ·APYᵢ) / T
Total interest is simply Σ Aᵢ − T, where T is your total investment. The blended APY is the principal-weighted average of the rung APYs — with an even split it reduces to the plain average of the rung rates.
Build phase vs. steady state. The default view is the build phase: you fund every rung on day one and they mature on a staggered schedule over the ladder's span. Once the first cycle completes, the ladder reaches steady state — each maturing rung is rolled into a new longest-term CD, so over time the whole balance earns close to the long-end rate while one rung still comes due every period. Turn on the optional reinvestment projection to see how the ladder converges toward that long-end yield.
Why APY, not a frequency field. Because an advertised APY already reflects how often a CD compounds, we standardize on APY for every rung to keep the portfolio math clean — no per-rung compounding frequency to juggle. (If you want to convert a nominal rate plus a compounding frequency into an APY, the single CD Calculator does that.) The reinvestment projection assumes each rolled rung earns the long-end APY you entered. All rates are user-supplied; the defaults are illustrative placeholders, not sourced market rates.
Tips for Building a Better CD Ladder
Pick Rung Count for Liquidity vs. Yield
More rungs mean a portion of your money matures more often, but each maturity is smaller; fewer, longer rungs concentrate cash in higher-yielding terms but free it up less frequently. Try 3, 5, and 8 rungs in the calculator and watch how the blended APY and the maturity cadence shift, then choose the balance that fits how often you might need access.
Reinvest Into the Long End
The classic way to run a ladder is to roll each maturing rung into a new longest-term CD. Over a full cycle this pulls your blended yield up toward the long-end rate while you still keep one rung maturing every period. Switch on the steady-state reinvestment projection to see how many years it takes the ladder to converge on that higher rate.
Weight Rungs With Custom Amounts
An even split is the simplest starting point, but custom amounts let you tilt the ladder. Overweight the longer rungs to chase yield, or load the short rungs if you expect to need cash soon. The calculator warns you if your custom amounts don't add up to your total, so the allocation always stays intentional rather than accidental.
Compare Against a Single CD
Before committing, check the ladder-vs-single-CD comparison. It shows what the same lump sum would earn in one CD at the shortest rung's rate and at the longest rung's rate, bracketing your ladder result. That gap is the price of liquidity — if it's small, the ladder's flexibility is nearly free; if it's large, you can decide whether the access is worth it.
Common Ways People Use a CD Ladder
Tiered Emergency Fund
SafetyKeep a few months of cash truly liquid, then ladder the rest so a rung matures every period as a penalty-free backstop. You earn more than a plain savings account while still having money come available on a regular schedule if you need it.
Retirement Income Stream
IncomeRetirees often ladder CDs so a predictable rung matures each year to cover living expenses, with longer rungs capturing higher rates in the meantime. The blended APY and maturity timeline make it easy to size each rung to the income you want on a given date.
Saving for Staggered Goals
GoalIf you have expenses landing in different years — tuition installments, a wedding, then a down payment — match each rung's term to a goal date. Each CD matures right when that bill is due, with a maturity value you can plan around in advance.
Parking a Windfall Safely
WindfallAfter a bonus, inheritance, or home sale, a ladder lets you lock in fixed returns without committing every dollar to one distant maturity. You stay diversified across terms and keep regular access while you decide on a longer-term plan for the money.
What This Calculator Assumes
To keep results deterministic and evergreen, the ladder model rests on a few clear assumptions:
- •APY-level compounding: Each rung grows with
A = P(1 + APY)^t. Because the advertised APY already accounts for how often a CD compounds, there is no per-rung frequency field here. - •Funded together, held to maturity: All rungs are funded on day one and held to their maturity dates, so no early-withdrawal penalty is subtracted. Interest compounds inside each CD rather than being paid out.
- •Reinvestment holds the long-end APY: The optional steady-state projection assumes each maturing rung is rolled into a new longest-term CD at the long-end APY you entered. Real rates change at each roll, so treat it as an illustration, not a forecast.
- •No taxes, fees, or penalties: Results are pre-tax and do not deduct account fees, early-withdrawal penalties, or inflation, and they model no FDIC/NCUA insurance limits.
- •You supply the rates: The tool never pre-fills current market rates. Default APYs are a gently rising illustrative curve, and every result comes from the numbers you enter plus timeless compound-interest math.
Disclaimer: This tool provides estimates for personal planning and is not financial, tax, or investment advice. Actual returns depend on your bank's terms and the rates available when you reinvest, and earnings shown are pre-tax. For significant financial decisions, consult a qualified professional.
Frequently Asked Questions
What is a CD ladder?
A CD ladder is a savings strategy that splits a lump sum across several certificates of deposit with staggered maturity dates, called rungs. For example, $25,000 might go into five $5,000 CDs maturing in 1, 2, 3, 4, and 5 years. Because one CD matures every year, you get regular access to a portion of your money, while the longer rungs still earn the higher rates that long-term CDs typically pay. It's a way to balance liquidity against yield instead of locking everything into one term.
How does this CD ladder calculator work?
Enter your total investment, the number of rungs, and the APY for each rung (or one APY for all of them). The calculator allocates your money across the rungs — evenly by default, or with custom amounts — and computes each rung's maturity value using compound interest, A = P(1 + APY)^t. It then sums the rungs to show your total value at maturity, total interest earned, and a principal-weighted blended APY, plus a per-rung table and a maturity timeline. Everything updates instantly and the link is shareable.
What's the difference between the build phase and steady state?
The build phase is the initial setup: you buy CDs of 1, 2, 3, 4, and 5 years all at once, and they mature on a staggered schedule over the next five years. Steady state begins after the first full cycle — when the shortest rung matures, you roll it into a new longest-term CD, and you keep doing that each period. In steady state every rung is effectively a long-term CD that happens to mature in a different year, so the whole balance earns close to the long-end rate while one rung still comes due every period. This calculator shows the build phase by default and can optionally project the steady state.
What is reinvestment in a CD ladder?
Reinvestment means taking the cash from a rung that just matured and putting it into a new CD — typically the longest term in your ladder — rather than spending it. Doing this each period is what carries a ladder from the build phase into steady state and lets the entire balance earn long-term rates over time. Our optional reinvestment projection assumes each maturing rung is rolled into a new long-term CD at the same long-end APY you entered; in reality the available rate will differ each time you roll.
Should I build a CD ladder or just buy one CD?
It depends on whether you value access to your cash or maximum yield. A single long-term CD usually pays the most but locks up all your money until one distant maturity date, with penalties for early withdrawal. A ladder gives up a little yield in exchange for having a portion mature every period, so you're never far from accessing cash penalty-free. This calculator shows both: it compares your ladder against putting the whole amount in a single CD at the shortest and longest rung's rate, so you can see exactly what the liquidity is costing you.
What is a blended APY and how is it calculated?
The blended APY is the principal-weighted average of your rungs' APYs — the single yield that summarizes the whole ladder. We compute it as the sum of each rung's amount times its APY, divided by the total invested. With an even split it's simply the average of the rung APYs; with custom amounts, rungs holding more money count more. It's a weighted average of advertised APYs, which is the figure savers expect, not an internal rate of return.
How many rungs should my CD ladder have?
There's no single right answer — more rungs mean more frequent access to cash but smaller amounts maturing each time, while fewer rungs mean larger, less frequent maturities. A common starting point is a five-rung, one-year-interval ladder spanning 1 to 5 years. If you want quarterly access you might use shorter intervals; if you want the most yield you'd lean toward fewer, longer rungs. This calculator supports 2 to 10 rungs so you can test the tradeoff for your own situation.
What are the pros and cons of a CD ladder?
Pros: predictable, fixed returns; regular access to a portion of your money; reduced risk of locking in at a bad time, since you reinvest at intervals; and generally higher blended yield than keeping everything short-term. Cons: it's more work to set up and manage than one CD; you may earn slightly less than a single long-term CD; CDs are less liquid than a savings account between maturities; and early withdrawal from any rung still triggers a penalty. A ladder is best when you want safety and some liquidity but don't need all your cash at once.
Do I have to split my money evenly across the rungs?
No. Even splits are the simplest and the default here, but you can use custom amounts to weight the ladder however you like — for instance, putting more in longer rungs to chase yield, or more in shorter rungs for liquidity. This calculator lets you enter a custom amount per rung and warns you if they don't add up to your total investment, so you stay in control of the allocation.
Are CD ladder earnings taxed, and is my money insured?
In most cases the interest each CD earns is taxable as ordinary income in the year it's credited, even before the CD matures, and banks report it on a tax form. CDs at federally insured banks are generally protected up to applicable government limits, with comparable coverage at credit unions. Because tax rules and insurance limits change over time, this calculator shows pre-tax earnings only and does not model taxes or insurance caps — verify current rules with your institution and a tax professional.
What happens if I withdraw from a rung early?
Withdrawing from a CD before its maturity date usually triggers an early-withdrawal penalty, often several months of interest, which varies by bank and term. One advantage of a ladder is that you rarely need to: because a rung matures every period, you can often wait for the next penalty-free maturity instead of breaking a CD. This calculator assumes every rung is held to maturity and does not subtract any penalty.
Why doesn't the steady-state projection match real life exactly?
The steady-state projection assumes you can reinvest each maturing rung at the same long-end APY you entered, but real CD rates rise and fall over time, so your actual rolled rates will differ. We keep the assumption fixed on purpose, so the tool stays evergreen and the math is reproducible from the link you share. Treat the steady-state figure as an illustration of how a ladder converges toward long-term rates, not a guaranteed forecast.