Certificates of deposit (CDs) pay a fixed rate for a fixed term, but locking all of your cash into a single long CD is risky: if rates rise, you are stuck; if you need the money early, you pay a penalty. A CD ladder solves both problems by splitting your savings into several CDs that mature at staggered intervals, so you have cash available every year while still earning the higher long-term rates.
This CD ladder calculator splits a lump sum evenly across 2 to 5 rungs, prices each rung at its own APY, and shows you the annual interest you will earn, the blended rate across the whole ladder, and a year-by-year maturity schedule. Adjust the sliders and watch the ladder rebuild instantly.
How to Use
- Enter your Total Investment — the cash you plan to deploy into CDs today. The ladder splits it evenly across every rung.
- Choose the Number of Rungs. Three rungs (a 1/2/3-year ladder) is the classic starting point; four or five rungs smooth the cash-flow even further but push the longest maturity out.
- Set the Shortest Term — the time until your very first CD matures. One year is standard; two years locks in a higher starting rate at the cost of slower first cash flow.
- Type the Shortest-Term APY. This is the rate on the shortest CD; check your bank or a rate-comparison site for today's best 12-month yield.
- Set the Rate Step Per Rung. Each longer CD usually pays a little more — 0.25% is a normal yield-curve slope, but 0.5% or 1.0% is common when the curve is steep.
- Read the result card. It shows the principal per CD, the first-year annual interest, the blended APY across the whole ladder, the total interest earned when the longest rung matures, and a row-by-row maturity schedule.
The schedule table is the heart of the tool: it lists each rung's term, rate, deposit, yearly interest, and maturity payout. Once a rung matures, you can roll it into a new long-term CD to keep the ladder intact.
How a CD Ladder Works
Suppose you have $60,000 and you build a 3-rung ladder with a 1-year shortest term. The money splits into three $20,000 CDs:
- Rung 1: $20,000 at 4.50% for 1 year → earns $900, matures in 12 months.
- Rung 2: $20,000 at 4.75% for 2 years → earns $950 per year, matures in 24 months.
- Rung 3: $20,000 at 5.00% for 3 years → earns $1,000 per year, matures in 36 months.
In Year 1 you collect $2,850 of interest, and a full $20,000 of principal becomes available after just one year. When that first rung matures, you roll it into a new 3-year CD at whatever the prevailing long rate is — if rates have risen, you now earn the higher rate on $20,000; if they have fallen, your other two rungs are already locked at the higher rate. The ladder gives you the average of short and long rates without betting everything on one direction.
The math on each CD uses simple interest, which is how most non-compounding bank CDs pay out: Interest = Principal × Rate × Years. Maturity value is principal plus that interest. The blended APY is just the total first-year interest divided by the total investment, so you can compare it directly against a single long CD or a high-yield savings account.
Why Ladder Instead of One CD?
- Liquidity: one rung matures every year, so you are never more than 12 months away from a chunk of penalty-free cash.
- Rate protection: when rates rise, your maturing rung can be reinvested at the new higher rate; when rates fall, your locked rungs keep earning yesterday's higher yield.
- Discipline: laddering forces you to take profits and redeploy rather than letting cash sit in a checking account.
- FDIC insurance: each CD at an FDIC-insured bank is covered up to $250,000 per depositor per ownership category, so a ladder well under that limit is fully insured.
Examples
Example 1 — The classic 3-rung ladder. With $60,000 split into 1-, 2-, and 3-year CDs at 4.50%, 4.75%, and 5.00%, each CD holds $20,000. Annual interest is $900 + $950 + $1,000 = $2,850, a blended APY of 4.75%. When the longest rung matures, the whole ladder is worth $65,800, for a total gain of $5,800.
Example 2 — A wider 5-rung ladder. A saver with $1,200,000 builds a 5-rung ladder starting at 4.50% with a 0.25% step. Each rung holds $240,000, the rates climb 4.50% → 5.50% across 1-to-5-year terms, and first-year annual interest is a steady $60,000. The ladder matures out to $1,386,000, earning $186,000 of total interest at a blended 5.00% APY.
Example 3 — Two rungs, steeper curve. With $100,000 in a 2-rung ladder, a 2-year base term, 5.00% starting rate and a 0.50% step, each CD holds $50,000. The 2-year CD pays 5.00% ($2,500/yr) and the 3-year CD pays 5.50% ($2,750/yr), for $5,250 of first-year interest. Total maturity value is $113,250.
FAQ
What is a CD ladder?
A CD ladder is a savings strategy where you split a sum of money across multiple certificates of deposit with staggered maturity dates — for example, a 1-year, 2-year, and 3-year CD totaling the same principal. One CD matures each year, giving you regular access to cash while the longer rungs keep earning higher rates.
How much do I need to start a CD ladder?
You can start with as little as the minimum opening deposit of your chosen banks — often $500 to $2,500 per CD. With three rungs, a practical minimum is around $3,000–$7,500. This calculator works on any starting amount and simply divides it evenly across the rungs you choose.
Are CD interest rates fixed for the whole term?
Yes. When you open a certificate of deposit, the APY and maturity date are locked in for the full term. The bank cannot change it, and you should not withdraw early without paying a penalty (typically 3–12 months of interest). That lock-in is exactly what a ladder protects: rising rates are captured as rungs mature, while falling rates do not touch your existing CDs.
Is a CD ladder better than a high-yield savings account?
A high-yield savings account is fully liquid but its variable rate can drop quickly when the Fed cuts. A CD ladder trades immediate full liquidity for a higher, locked average rate: you get one-year access to a slice of principal every 12 months plus a blended yield that is usually 0.5%–1.5% above savings. If you may need every dollar tomorrow, keep it in savings; if you can split the cash, a ladder usually wins.
Do I pay taxes on CD interest?
Yes. CD interest is taxed as ordinary income at your federal marginal rate (and usually your state rate) in the year it is credited, even if you do not withdraw it. Banks send a 1099-INT in January for the prior year. Holding CDs inside an IRA or Roth IRA defers or eliminates that tax — a useful upgrade if you are laddering long-term savings.
What happens when a CD in my ladder matures?
Banks typically give you a grace window (7–10 days) after maturity to withdraw or move the money. To keep the ladder running, you roll the matured principal plus interest into a new longest-term CD (e.g., when your 1-year rung matures, open a new 3-year CD). That keeps a rung maturing every year indefinitely.
Are CDs FDIC insured?
Yes, at FDIC-member banks, up to $250,000 per depositor, per insured bank, per ownership category. If your ladder totals well under that and sits at one bank, every dollar is insured. To exceed the limit safely, spread rungs across multiple FDIC-member institutions.
Related Calculators
- CD Calculator — estimate interest and maturity value on a single certificate of deposit.
- High-Yield Savings Calculator — compare a ladder's blended APY against a variable-rate HYSA.
- Compound Savings Calculator — project how reinvesting ladder interest grows over time.
- Savings Account Calculator — forecast a regular savings balance alongside your CD ladder.
Disclaimer
This CD ladder calculator is provided for informational purposes only and does not constitute financial, tax, or investment advice. Interest figures are estimates based on the APYs and terms you enter; actual CD rates, early-withdrawal penalties, compounding conventions, and FDIC coverage limits vary by bank and over time. Tax treatment depends on your individual situation. Always confirm rates, terms, and penalties directly with the issuing bank, and consult a qualified financial professional before committing funds.