CD Ladder Calculator - Certificate of Deposit Ladder Strategy

How to use this tool

1. Enter the total amount you want to invest.
2. Choose the number of rungs (CDs) in your ladder.
3. Set the base APY and rate step, then edit individual rung APYs to match bank quotes if needed.
4. Choose the term step (e.g., every 3 months, 6 months, or 1 year).
5. Choose simple or annual-compound APY estimates and optionally enter a start date.
6. Review the blended APY, maturity schedule, and estimated interest.

What is a CD ladder?

A CD (Certificate of Deposit) ladder is a savings strategy where you spread your savings across multiple CDs with staggered maturity dates instead of putting all your money in one CD. This gives you regular access to a portion of your savings while still benefiting from the higher interest rates of longer-term CDs.

How it works

Example: invest $10,000 equally across five CDs: 1-year, 2-year, 3-year, 4-year, and 5-year. When the 1-year CD matures, reinvest it as a new 5-year CD. After 5 years, you have five CDs all maturing annually at the 5-year rate - maximum yield with annual liquidity.

Use the calculator with quoted rates

The base APY and APY step generate a convenient starting curve, but real bank quotes often vary by term. Edit the APY beside any rung to enter a quoted rate; the other rungs keep their rates. Choose Apply linear curve to replace custom entries with rates generated from the current base and step. The calculator continues to split principal equally across rungs, so it is useful for comparing rate sheets against the same investment amount.

Choose the interest model to see how the assumption changes the estimate. Simple mode uses principal × APY × years. Annual compound APY mode uses principal × ((1 + APY)^(months / 12) − 1), treating APY as an effective annual yield for fractional terms. For example, a 12-month $2,500 CD at 4.75% APY earns $118.75 in either mode under these assumptions. Shorter terms can differ because annual mode applies a fractional-year compound calculation. Actual banks may compound daily or monthly and may use their own day-count and crediting rules.

The blended APY is the equal-principal average of the rung rates. Entering a start date adds a calendar maturity date for each term; dates that land beyond a month’s final day are clamped to that month’s end. For instance, a three-month rung starting January 31 matures April 30. The exact maturity value and interest also depend on the selected interest model, and this tool does not include taxes, early-withdrawal penalties, or future reinvestment rates.

Advantages

• Liquidity: a portion of your money is always maturing soon.
• Higher average yield: longer-term CDs pay more interest than short-term ones or savings accounts.
• Rate protection: spreading maturities means you'll reinvest at different interest rate environments, averaging out rate risk.

Current rate environment

CD rates fluctuate significantly with the federal funds rate. When rates are rising, a ladder benefits from reinvesting maturing short-term CDs at higher rates. When rates are falling, the longer-term rungs lock in higher rates before they drop. For current rates, check the FDIC National Rate and Rate Cap data or a rate aggregator such as Bankrate or NerdWallet. Always verify rates directly with your institution before opening a CD.

Disadvantages

• Early withdrawal penalties: withdrawing funds from a CD before maturity typically incurs a penalty of 90–180 days of interest (varies by term and bank). This reduces flexibility in genuine emergencies.
• Less flexible than HYSA: a high-yield savings account offers similar or comparable rates in some interest rate environments with immediate access to funds and no penalty. Compare current HYSA rates before committing to a CD ladder.
• FDIC insurance limit: FDIC insurance covers up to $250,000 per depositor per institution per ownership category. Large CD ladders across a single bank may exceed this limit.

Step-up CDs and callable CDs

• Step-up CDs: interest rate increases at scheduled intervals during the term. Useful in rising rate environments, but the base rate is usually lower than a comparable fixed-rate CD.
• Callable CDs: the bank can terminate the CD early (paying the full principal and accrued interest) if rates fall, eliminating your high-rate lock-in at the worst possible time. Understand the call provisions before purchasing.