About the CD Ladder Calculator
A CD ladder spreads your money across several certificates of deposit with staggered terms — for example 1, 2, 3, 4 and 5 years. One CD matures at regular intervals, giving you access to part of your cash, while the rest earns the higher rates that longer terms usually pay. When a rung matures you either spend it or roll it into a new CD at the longest term, keeping the ladder going.
This calculator splits your deposit evenly across the number of rungs you choose, spaces the terms by 3, 6 or 12 months, and assigns each rung a rate between the shortest and longest CD rates you enter. It shows the value and interest of every rung at maturity, the total interest for the first cycle, and the yearly interest you can expect once every rung has been rolled into the longest term.
Rates in between are interpolated evenly, which is an estimate — enter real quotes from your bank if you want exact numbers. Rates are treated as APY and interest is assumed to stay in the CD until maturity. CDs at FDIC- or NCUA-insured institutions are protected up to $250,000 per depositor, per bank, per ownership category.
With the default inputs, the total value at maturity (first cycle) is $57,191.13. Change any value above to recalculate instantly.
How to use the cd ladder calculator
- 1Enter the total amount you want to put into CDs.
- 2Choose how many rungs and how far apart they mature.
- 3Enter the APY for the shortest and longest CD you are considering.
- 4Review each rung’s interest and maturity in the table.
- 5When a CD matures, roll it into a new longest-term CD to keep the ladder going.
Formula and method
Your deposit D is split equally across N CDs. Rung i has a term of i × the spacing in months and an APY interpolated in a straight line from the shortest to the longest rate. Because APY already includes compounding, each rung’s value at maturity is its deposit × (1 + APY) raised to the term in years. Total interest is the sum of every rung’s interest over the first cycle.
After the first cycle, each maturing CD is reinvested at the longest term, so the fully built ladder earns roughly the longest rate on the whole balance, while still maturing one rung every spacing period.
- D
- Total deposit
- N
- Number of rungs
- APYᵢ
- Annual percentage yield of rung i
- termᵢ
- Term of rung i in months
Worked examples
$50,000 across a 5-year ladder
$10,000 goes into each of the 1- to 5-year CDs, with rates stepping from 4.00% to 4.75%. The 5-year rung grows to about $12,612. In total the first cycle earns about $7,191, and once fully laddered at 4.75% the $50,000 earns about $2,375 a year.
Short ladder: $20,000 in quarterly rungs
Four $5,000 CDs mature at 3, 6, 9 and 12 months with rates of 4.0%, 4.2%, 4.4% and 4.6%, earning about $547 in total while freeing up cash every quarter.
$100,000 in ten 6-month rungs
Ten $10,000 CDs from 6 months to 5 years, rates from 3.5% to 4.4% in 0.1% steps, earn about $11,907 over the first cycle.
Frequently asked questions
How does a CD ladder work?+
You divide your money among CDs with different maturities. When the shortest one matures you reinvest it at the longest term. After one cycle, every CD is a long-term CD earning a higher rate, yet one matures every year (or quarter), giving you regular access to cash.
How many rungs should a CD ladder have?+
Five rungs one year apart is the classic setup. Use more, shorter rungs (3 or 6 months apart) if you want more frequent access to your money, or fewer if you have a smaller amount and want to meet bank minimums.
What happens if rates rise or fall?+
A ladder reduces timing risk. If rates rise, a rung matures soon and can be reinvested at the higher rate. If rates fall, the longer rungs keep earning the older, higher rates for years.
Is a CD ladder better than a high-yield savings account?+
A ladder locks in rates, which helps when rates may fall, while a high-yield savings account offers full liquidity but a variable rate. Many savers keep an emergency fund in savings and longer-term cash in a CD ladder.
Are CDs insured?+
Yes, CDs at FDIC-insured banks and NCUA-insured credit unions are covered up to $250,000 per depositor, per institution, per ownership category. Split larger ladders across institutions to stay fully insured.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.
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