CD Ladder Calculator
Split a deposit across staggered CD terms and see each rung's payout below, compared against a single CD at the longest term.
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A 5-rung ladder covers 1 through 5-year terms; a 3-rung ladder covers 1 through 3 years.
Real rates typically vary by term. This uses one rate across all rungs for simplicity -- for precise per-term rates, run each rung separately in the CD Calculator.
| Rung | Deposit | Value at maturity |
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This is a general estimate, not financial, investment, or tax advice.
Built by Cedrick Reese · How this is verified
Heads up: this calculator assumes the same APY across every rung for simplicity. Real CD rates vary by term, early withdrawal carries a penalty (see the CD Early Withdrawal Penalty Calculator), and this isn't financial or tax advice.
How to Use This Calculator
Enter the total amount you want to ladder, choose 3 or 5 rungs, and enter one blended APY (real rates vary by term, so this is a simplification -- for exact per-term rates, run each rung separately in the CD Calculator). The result shows each rung's individual payout, the ladder's total value, and an honest comparison against putting the same total into a single CD at the longest term.
Table of contents
How CD Laddering Works
A CD ladder splits a lump sum evenly across several CDs with staggered terms -- typically 1 through 5 years. Each rung is calculated with the standard compound interest formula: deposit × (1 + APY/n)^(n × years). As each rung matures, the saver can spend it, or reinvest it into a new long-term CD to keep the ladder rolling -- this calculator models the first maturity of each rung, not an ongoing multi-cycle reinvestment projection, since assuming a fixed future rate multiple years out gets speculative fast.
Ladder vs. a Single CD
Here's the honest trade-off: in a flat-rate environment, putting the entire amount in one CD at the longest term usually earns more total interest than a ladder, because the whole balance earns the top rate immediately instead of only one-fifth of it. The ladder's actual value is liquidity -- a portion of the money becomes available every year -- not a higher return. Ladders tend to look more attractive specifically when rates are rising, since maturing short-term rungs can reinvest at the new, higher rates.
Using this page's own default numbers: a $25,000 deposit split across a 5-rung ladder at 4.5% APY, monthly compounding, grows to about $28,663.94 at each rung's first maturity, a total of $3,663.94 in interest. Putting that same $25,000 into a single 5-year CD at the same rate grows to about $31,294.90, or $6,294.90 in interest -- roughly $2,630.96 more than the ladder earns, in exchange for giving up the annual access the ladder provides.
Frequently Asked Questions
Is a CD ladder better than a single CD?
Not necessarily in dollar terms -- a single CD at the longest term commonly earns more total interest in a flat-rate environment, since the full balance earns the top rate immediately. A ladder trades some of that return for annual liquidity.
How many rungs should I use?
3 or 5 rungs are the most common setups. 3 rungs are simpler with annual access over 3 years; 5 rungs capture more of the yield premium from longer terms while still providing annual liquidity.
What happens when a rung matures?
You can spend the proceeds, or reinvest into a new long-term CD to keep the ladder going. Over time, reinvesting consistently turns the whole ladder into all long-term-rate CDs with one maturing each year.
Can I break a rung early if I need the cash?
Yes, subject to that CD's early withdrawal penalty. See the CD Early Withdrawal Penalty Calculator to estimate the cost before doing so.
Sources
- Per-rung deposit and future-value formula — GenToolLab
- A single CD at the longest term commonly earns more than a ladder in a flat-rate environment — eFinanceCalculator
How This Calculator Is Verified
Built by Cedrick Reese. Each rung's future-value calculation is checked against GenToolLab's published formula, and the honest point that a single longer-term CD commonly out-earns a ladder in a flat-rate environment is checked against eFinanceCalculator's analysis before publishing.
Last reviewed: August 25, 2026