CD Ladder Calculator

How to use this calculator

Enter your total investment amount — the lump sum you want to allocate across your CD ladder. Then choose the number of CDs (rungs) you want, from 2 to 6.

For each CD rung, enter:

• Amount — how much to put in this specific CD (or click Equal Split to divide the total evenly)
• Term — the maturity length in months (e.g., 12, 24, 36)
• Rate — the annual interest rate offered for that term
• Compounding — how often interest compounds (monthly is most common)

Click Calculate Ladder to see total interest earned, weighted average APY, maturity dates, and a complete rung-by-rung breakdown.

The Equal Split button fills every rung with the same dollar amount based on your total investment and number of CDs. You can then manually adjust individual amounts if you want to weight specific rungs differently.

What a CD ladder is

A CD ladder is a strategy for spreading a lump sum across multiple CDs with staggered maturity dates. Instead of putting all your money into one CD, you split it into several rungs, each maturing at a different time.

The classic version uses equal amounts in CDs of 1, 2, 3, 4, and 5 years. Every year, the shortest CD matures and you reinvest it into a new 5-year CD at the end of the ladder. After the first 5 years, you have a CD maturing every 12 months indefinitely.

The strategy solves two problems simultaneously:

Liquidity problem. A single 5-year CD ties up your entire investment. A ladder means part of your money matures every year, giving you regular access without penalties.

Rate uncertainty problem. If you put everything into a 1-year CD, you face the risk of rates falling when you reinvest. If you lock everything into a 5-year CD, you miss out if rates rise. A ladder averages your exposure to rate changes across multiple terms.

The formula

Each rung uses the standard compound interest formula:

APY for each rung:

The weighted average APY of the ladder is the dollar-weighted average of each rung’s APY:

The weighted APY tells you the effective yield across the entire ladder, accounting for the fact that some rungs may hold more money than others.

Maturity date calculation: Each rung’s maturity date is today’s date plus the term in months.

CD ladder vs single CD: a direct comparison

The single CD wins when you are confident rates have peaked and will fall. The ladder wins when you are uncertain about rate direction or need predictable access to funds at regular intervals.

A hybrid approach: put 60-70% in a single long-term CD and ladder the remaining 30-40% across shorter terms. You capture most of the long-term rate while keeping some liquidity.

CD ladder rate benchmarks by rung count

How much does a ladder cost you versus putting everything in the longest-term CD? The “opportunity cost” depends on the yield curve shape.

These ranges reflect a 2024 rate environment. In a normal upward-sloping yield curve, each rung added slightly reduces your weighted APY (the short rungs pull the average down). In a flat or inverted curve, more rungs do not significantly reduce yield.

Real-world examples

Building a liquidity buffer for a small business

A business owner has $100,000 in operating reserves. They want the money to earn interest but need $25,000 available roughly every 6 months.

Retirement income staging

A retiree has $200,000 set aside for the next 5 years of living expenses. They need $40,000 per year.

Common mistakes

Putting all rungs at the same bank. FDIC insurance is $250,000 per depositor per institution. A $300,000 ladder at one bank leaves $50,000 uninsured. Spread across multiple banks or use different account ownership types.

Not accounting for auto-renewal. When a rung matures, most banks auto-renew into the same term at the current rate. If you forget to act within the grace period (usually 7-10 days), you might end up locked into a new CD at an unfavorable rate.

Ignoring the inverted yield curve. When short-term rates exceed long-term rates (inverted curve), the traditional ladder paying more on longer terms does not exist. In an inverted curve, shorter rungs may pay more than longer ones, which changes the optimal allocation.

Treating a ladder as a passive set-and-forget strategy. A ladder requires attention at each maturity. When a rung comes due, you need to decide: reinvest at the current rate, move to a HYSA, or spend the proceeds. The strategy is only as good as the decisions made at each maturity event.

Overcomplicating with too many rungs. Six CDs across six different banks with six different maturity dates and six different compounding schedules is a management burden. Three to five rungs is the practical sweet spot for most individual investors.

The bottom line

A CD ladder is not a complicated strategy. It is just a systematic way to hold CDs of different terms so that liquidity and rate exposure are both managed. The math is the same as any compound interest calculation — you are just running it across multiple CDs simultaneously.

The meaningful decisions are: how many rungs, how to allocate among them, which banks offer the best rates at each term, and what to do when each rung matures. This calculator handles the numbers. The strategy decisions are yours.

For most people with a 1-5 year savings horizon who want predictable, insured returns, a 3-5 rung CD ladder beats both a savings account (for yield) and a single long-term CD (for flexibility). The weighted APY shown in the calculator is your single best summary metric for comparing ladder configurations against each other.