CD ladder calculator: interest, rungs and maturity dates
$25,000 split into five rungs a year apart at 4.25% APY earns $3,374 of interest and grows to $28,374, with a certificate maturing every twelve months. Enter your own total, number of rungs, spacing and APY below to get the whole schedule — the amount per rung, every maturity date, and exactly what each certificate pays. Everything runs in your browser; nothing is uploaded.
How the ladder is built
- The total is divided equally across the rungs. Rung 1 matures after one spacing period, rung 2 after two, and so on, so the longest rung's term is rungs × spacing.
- Interest uses the annual percentage yield (APY) you enter, compounded once per year to maturity: value = amount invested × (1 + APY)years. APY already includes compounding.
- A single APY is applied to every certificate. In practice, longer terms may pay a different rate — check current offers for each term.
- Maturity dates count forward in whole months from today; interest assumes you hold each CD to maturity without early withdrawal.
An estimate for planning, not a rate quote or financial advice. It ignores early-withdrawal penalties, taxes on interest (CD interest is taxable the year it's credited), and rate changes when you reinvest a matured rung. Confirm each term's APY with your bank or credit union.
What is a CD ladder?
A CD ladder is a set of certificates of deposit with staggered maturity dates. Instead of locking your entire balance into one term, you divide it into equal "rungs" — say five CDs maturing one year apart. Each year a rung matures and you can either spend the cash or reinvest it into a new long-term CD at the top of the ladder. The ladder blends the higher yields of long CDs with the regular access of short ones.
How to build a CD ladder, step by step
Laddering CDs takes five decisions, and the calculator above turns them into a dated schedule:
- Decide how much to ladder. Use money you will not need at a moment's notice — a CD ladder is for known future spending, not your emergency fund.
- Choose the number of rungs. Five is the common default. More rungs mean a maturity comes round more often; fewer rungs mean each one is larger.
- Choose the spacing. Twelve months between rungs gives you one maturity a year; three or six months gives you access far more often at a slightly lower average yield.
- Split the money evenly and buy the terms. With five rungs a year apart you buy a 1-year, 2-year, 3-year, 4-year and 5-year CD on day one, each holding a fifth of the total.
- Roll each maturing rung into a new longest-term CD. After one full cycle every rung is a 5-year CD earning the longest-term rate, but one still matures every year.
Enter your total, rungs, spacing and APY above to see the amount per rung, every maturity date, and what each certificate pays.
How much interest does a CD ladder earn?
More than a single short CD and less than a single long one — because the rungs sit at every term in between. Take the default $25,000 across five rungs a year apart at 4.25% APY. Each rung holds $5,000 and compounds to its own maturity:
- Rung 1, 1 year — $212.50 of interest, $5,212.50 at maturity
- Rung 2, 2 years — $434.03, $5,434.03
- Rung 3, 3 years — $664.98, $5,664.98
- Rung 4, 4 years — $905.74, $5,905.74
- Rung 5, 5 years — $1,156.73, $6,156.73
Total interest: $3,373.98, or 13.5% of the original $25,000 across the whole five-year cycle. Rung 5 alone earns more than five times what rung 1 does, which is the entire argument for having long rungs at all — and the reason the standard move is to roll every maturing rung back into a new longest-term CD.
The rate does the rest of the work. The same ladder at 4.00% APY earns $3,164.88 and at 5.00% earns $4,009.56 — a single percentage point is worth $845 over the cycle, which is why it is worth shopping each term rather than taking one bank's whole menu.
Building a 10-year CD ladder
A ten-rung, one-year-spacing ladder is the long version of the same idea: a certificate matures every year for a decade, and once the cycle completes every rung is a ten-year CD earning the top of the curve. $50,000 across ten rungs at 4.25% APY earns $13,312 in total and grows to $63,312 — 26.6% of the original amount, roughly double the five-rung return on the same per-rung amounts, because the later rungs compound for twice as long.
The trade is commitment. Rung 10 is locked for a decade, and ten-year CDs are not always offered or competitively priced. In practice many savers cap the ladder at five to seven years and treat anything longer as a bond allocation instead. Set the rungs to 10 and the spacing to 12 above to see the full ten-year schedule.
A short ladder for cash you might actually need
Spacing does not have to be annual. Four rungs three months apart turns $20,000 into a schedule where something matures every quarter: $52.30, $105.14, $158.54 and $212.50 of interest, $528.49 in total over the first year. That is far less than a five-year ladder earns, but every dollar is reachable within ninety days without a penalty — which is what makes a short ladder a reasonable home for the back half of an emergency fund.
Why build a ladder instead of one big CD?
- Liquidity without penalty. A rung matures on a predictable schedule, so you reach some of your money regularly without paying an early-withdrawal penalty.
- Rate protection. Because you're always reinvesting a rung, you're never fully locked in when rates rise — and you keep some long-term yield when rates fall.
- Steady income. Retirees often ladder CDs so a chunk matures each year to cover expenses.
How to reinvest a maturing rung
The classic move is to reinvest each maturing rung into a new CD at the longest rung of your ladder. After a full cycle, every rung is a long-term CD (capturing the best rate), yet one still matures every spacing period. If you'd rather keep the ladder short — for an emergency reserve, say — just choose a shorter spacing and fewer rungs.
CD ladder vs. a high-yield savings account
A high-yield savings account keeps every dollar liquid but its rate can change any day. A CD locks your rate for the term, which is valuable when you expect rates to fall, but ties the money up. A ladder is the middle path: most of your balance earns locked CD rates while a portion frees up on schedule. Many savers pair a small savings buffer with a CD ladder for the rest.
Frequently asked questions
How much interest does a CD ladder earn?
It depends on the amount, the rates and how long the rungs run. $25,000 in five rungs a year apart at 4.25% APY earns $3,373.98 over the full five-year cycle — $212.50 from the one-year rung up to $1,156.73 from the five-year one. A ten-rung version of the same per-rung amount, $50,000 total, earns $13,312 because the later rungs compound for twice as long.
Do I need a CD ladder spreadsheet?
No. A spreadsheet is only tracking four things per rung — amount, term, maturity date and interest — and this page generates all of them, including the dates, from the amount and APY you enter. Copy the schedule into a sheet if you want a permanent record, but the arithmetic does not need one.
How does a CD ladder work?
You split your money into equal amounts and buy CDs with staggered terms — for example five CDs maturing one, two, three, four, and five years out. As each shorter CD matures you reinvest it into a new longest-term CD, so you always have one maturing soon while the rest earn higher long-term rates.
How many rungs should a CD ladder have?
It depends on your goal. A common setup is five rungs spaced a year apart, but you can build anywhere from two to ten. More rungs smooth out access and rate changes; fewer rungs are simpler to manage. Shorter spacing (such as three or six months) gives you access more often but usually at lower rates.
Is CD interest taxable?
Yes. Interest credited on a CD is taxable as ordinary income in the year it's earned, even if you don't withdraw it, and your bank reports it on a 1099-INT. Holding CDs inside an IRA can defer or avoid that tax. This calculator shows pre-tax interest.
What happens if I withdraw from a CD early?
Most CDs charge an early-withdrawal penalty — commonly a few months to a year of interest — if you cash out before maturity. That's the whole point of a ladder: with a rung maturing on schedule, you rarely need to break a CD early to reach cash.
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