🪜 CD Ladder Calculator

Split your savings across multiple certificates of deposit with staggered maturities. See the amount, APY, maturity value, and interest earned for every rung, plus your overall blended yield.

Total Interest Earned

—

Total Interest — Blended APY — Total Maturity Value —

Ladder Breakdown by Rung

Rung	Amount	APY	Years to Maturity	Maturity Value	Interest Earned

T-Bill Calculator I Bond Calculator Compound Interest Calculator

GUIDE

Learn more

What Is a CD Ladder and Why Build One?

A CD ladder splits a lump sum across several certificates of deposit with staggered maturity dates instead of locking it all into a single CD term. For example, $25,000 split into five equal $5,000 rungs maturing in 1, 2, 3, 4, and 5 years gives you predictable, recurring access to cash while still capturing the higher yields that longer-term CDs typically pay. As each rung matures, you can either withdraw the funds or reinvest at the current top rate, which is usually the longest available rung. This structure balances two competing goals savers face constant liquidity and maximum yield without forcing an all-or-nothing choice between a low-yield savings account and a multi-year CD that penalizes early withdrawal. Because CD rates generally rise with term length, longer rungs in a ladder should carry a higher APY, and this calculator lets you model that by setting a base rate for the shortest rung and a per-year rate step for each subsequent, longer rung.

How Blended APY Is Calculated

Blended APY (also called weighted average yield) tells you the effective annual return of your entire ladder as if it were one account, rather than looking at each rung in isolation. It is calculated as the sum of each rung dollar amount multiplied by its APY, divided by the total amount invested. When every rung holds an equal dollar amount, as in a standard ladder, the blended APY simplifies to the plain average of the individual rung rates. This number matters because a single headline "top CD rate" advertised by a bank usually applies only to the longest term offered, and it overstates what you actually earn once you account for the lower rates on your shorter, more liquid rungs. Comparing blended APY across different ladder structures (3-rung vs 5-rung, for instance) helps you evaluate the true tradeoff between liquidity and yield.

Choosing the Right Number of Rungs

The number of rungs in your ladder is a tradeoff between simplicity and liquidity granularity. A 3-rung ladder (1, 2, 3 years) is easier to manage and still provides yearly liquidity, making it a good fit for savers with a shorter time horizon or smaller balances where opening five separate accounts feels excessive. A 5-rung ladder (1 through 5 years) captures a wider spread of rates, typically locking in higher yields on the back-end rungs while still offering annual access to a portion of your funds. Some savers also build "mini-ladders" with monthly or quarterly maturities inside a single year for very short-term cash management, though the standard annual-step ladder modeled here (1 through N years) is the most common approach used by banks and credit unions when advertising ladder rate schedules.

CD Ladders vs High-Yield Savings and Treasury Bills

A CD ladder is one of several ways to balance yield and access. High-yield savings accounts offer full liquidity and variable rates that can rise or fall with the Federal Reserve's target rate, while a CD locks in a fixed APY for its term regardless of what rates do afterward, which is valuable if you expect rates to fall. Treasury bills (see our T-Bill Calculator) offer similarly fixed, short-term yields backed by the federal government and are exempt from state and local income tax, an advantage CDs do not share. Many savers combine strategies: keeping an emergency fund in high-yield savings, a CD ladder for medium-term goals with known timelines, and Treasury bills or Series I bonds for additional diversification. Reviewing how each rung of your ladder compares to current T-bill and savings yields before committing funds is a reasonable diligence step.

Early Withdrawal Penalties and Reinvestment Risk

Before building a ladder, understand your bank's early withdrawal penalty (EWP) policy, since breaking a CD before maturity typically forfeits a portion of accrued interest, commonly 90 days of interest for terms under a year and up to 365 days of interest for terms of five years or longer. This calculator assumes each rung is held to full maturity, which is the standard, penalty-free way to realize the maturity values shown. The other major risk is reinvestment risk: when a rung matures, the rate available for a new CD may be lower than what you originally locked in, especially in a falling-rate environment. Laddering partially mitigates this by never having all your money exposed to a single reinvestment decision at once, since only one rung matures at a time.

Are CDs FDIC Insured and How Does Tax Treatment Work?

Certificates of deposit at FDIC-member banks are insured up to $250,000 per depositor, per ownership category, per institution, meaning a CD ladder at a single bank is fully protected as long as your total balance across accounts there stays under that threshold; credit unions offer equivalent NCUA insurance. Interest earned on CDs is taxed as ordinary income in the year it is earned or credited, even if you do not withdraw it, and banks issue a Form 1099-INT for any account earning $10 or more in interest during the year. Because CD interest is fully taxable at your marginal federal (and often state) rate, savers in higher tax brackets sometimes compare after-tax CD yield against tax-advantaged alternatives like Series I bonds, whose interest is exempt from state and local tax (see our I Bond Calculator) or municipal bonds.

Building and Maintaining Your Ladder Over Time

Once your initial ladder matures on schedule, most savers "roll" each maturing rung into a new long-term CD equal to the ladder's longest rung, which keeps the ladder perpetually staggered and captures whatever the current top rate is at each renewal point. For example, in a 5-rung ladder, when the 1-year rung matures, you reinvest it into a new 5-year CD, so the following year another rung matures and the cycle continues indefinitely. This calculator models the initial build-out of the ladder; use it periodically as rates change to re-evaluate whether your base APY and rate-step assumptions still reflect what banks in your area are currently advertising, since CD rates can move meaningfully within a single Fed rate cycle. For a broader view of how your total portfolio return compares once inflation is factored in, our Inflation Calculator and Compound Interest Calculator can help contextualize your real (inflation-adjusted) CD ladder returns alongside other tools like the Mortgage Calculator or Loan Calculator for the rest of your financial plan.

Frequently asked questions

What is a CD ladder in simple terms?

A CD ladder is a savings strategy where you divide your money into several certificates of deposit with different maturity dates, usually spaced one year apart, so that some of your money becomes accessible every year while the rest continues earning a higher, longer-term rate.

How is the APY for each rung determined in this calculator?

This calculator uses a simplified model: the shortest rung (maturing in year 1) earns your entered base APY, and each subsequent, longer rung earns that base rate plus an additional rate step per year. You can adjust both the base APY and the rate step to match rates currently advertised by your bank.

What is blended APY and why does it matter?

Blended APY is the weighted average yield across all rungs in your ladder, calculated as total interest divided by total principal (annualized). It reflects your ladder's true overall return, which is typically lower than the single highest rung rate a bank might advertise.

What happens if I withdraw from a CD before it matures?

Most CDs charge an early withdrawal penalty equal to a set number of months of interest, which reduces your actual return below what is shown here. This calculator assumes every rung is held to full maturity without penalty.

Are CD ladders FDIC insured?

Yes, CDs held at FDIC-member banks are insured up to $250,000 per depositor, per ownership category, per bank. Credit unions offer equivalent protection through the NCUA.

Is this tool financial advice?

No. This calculator is for educational and estimation purposes only and does not constitute financial, investment, or tax advice. Actual bank rates, compounding methods, and penalty terms vary consult your bank or a licensed financial advisor before making decisions.