CD Ladder Calculator

Free CD ladder calculator: split a deposit across staggered CD terms, reinvest each rung as it matures, and project your balance and effective yield over time.

What Is a CD Ladder?

A CD ladder splits one deposit across several Certificates of Deposit (CDs) with staggered maturity dates instead of locking it all into a single term. As each CD matures, you get periodic access to part of your money while the rest keeps earning the higher rates that longer terms usually pay.

This calculator projects how a ladder grows over time: it simulates each rung running its own term, then, once it matures, reinvests the full payout into a new CD using the longest term and rate in your ladder -- the common way savers keep a ladder rolling year after year.

How to Use This CD Ladder Calculator

Enter your total amount The full amount you want to spread across the ladder. It is split evenly across every rung you add.
Add a rung for each CD Enter the term (in months) and APY for each CD in your ladder, for example 3, 6, 9, and 12 months.
Set a projection period Choose how many years ahead you want to project the ladder, assuming each rung keeps reinvesting at its own rate when it matures.
Read the balance and breakdown Check the year-by-year combined balance, the effective annual yield, and each rung's individual contribution at the end of the period.

Tips for getting more out of it

Keep the term spacing even (for example every 3 months) so a rung matures on a predictable, regular schedule rather than in irregular clusters.
If you are not sure how many rungs to use, start with four (3, 6, 9, and 12 months) and adjust the count once you see how often you actually want access to part of the balance.
Check each bank's early withdrawal penalty before building a ladder there -- a ladder only helps with liquidity if you are comfortable holding each rung to its own maturity date.
Some banks let you open all the CDs in a ladder from a single account, which can make tracking maturity dates and reinvesting easier than juggling several separate accounts.

When to Use a CD Ladder Calculator

Planning a new ladder from scratch

Compare a handful of rung counts and term spreads to see which structure balances liquidity and yield the way you want.

Projecting an existing ladder forward

Enter the terms and rates of CDs you already hold to see roughly where the combined balance will land in a few years.

Comparing a ladder against a single CD

Run this calculator alongside a single-CD calculator to see whether spreading maturities costs you much yield in exchange for more flexibility.

CD Ladder Glossary

CD ladder: A strategy of splitting a deposit across multiple CDs with different maturity dates so that funds become available periodically instead of all at once.
Rung: One CD within a ladder, defined by its own term and APY.
APY (Annual Percentage Yield): The effective annual rate of return, including the effect of compounding, expressed as a single percentage.
Maturity: The date a CD's term ends, at which point the deposit and its earned interest become available without an early withdrawal penalty.
Reinvestment: Rolling a matured CD's payout into a new CD rather than withdrawing it, which is what keeps a ladder running over multiple years.
Effective annual yield: The compound annual growth rate implied by a ladder's starting deposit and its projected ending balance, letting you compare the whole ladder to a single fixed rate.

CD Ladder Calculator FAQ

There is no fixed rule -- more rungs give you more frequent access to your money but spread your funds thinner across each term. Four to six rungs (for example 3, 6, 9, and 12 months) is a common starting point that balances liquidity against simplicity.

Most CD ladder strategies call for reinvesting the full payout (principal plus interest) into a new CD at the longest term in the ladder, which is what this calculator assumes. You can also choose to withdraw a matured rung instead if you need the cash.

It depends on the rate environment. If longer-term CDs pay meaningfully more than shorter ones, a ladder can earn slightly less than locking everything into the longest term, in exchange for periodic liquidity. If rates are flat across terms, a ladder and a single CD earn about the same.

Future CD rates are unknown, so the calculator holds each reinvestment rate constant as a simplifying assumption, the same approach used by most CD ladder calculators. Revisit the projection with updated rates whenever a rung actually matures.

Side Note -- Why Ladders Became Popular When Rates Started Moving Again

CD laddering is an old idea, but it saw renewed interest once central banks began raising interest rates sharply after years of near-zero yields. When rates are rising, locking a large deposit into one long-term CD risks missing out on even higher rates a year later, so savers spread deposits across several terms to keep some cash rolling into new CDs at the latest, and often better, rates.

The opposite is true when rates are expected to fall: savers who believe today's yields are unusually good sometimes prefer a single long-term CD to lock in the rate for as long as possible, rather than a ladder that keeps exposing part of the balance to reinvestment at lower future rates. Neither approach is universally correct -- it depends on a saver's view of where rates are headed and how much access to cash they need along the way.

In practice, many ladders are built with unequal terms on purpose, front-loading shorter rungs (3 or 6 months) so the first few reinvestment decisions come quickly, while longer rungs (9 or 12 months, or beyond) anchor the ladder with a higher fixed rate for the funds a saver is confident they will not need soon.

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