Quick answer
A CD ladder splits money into equal rungs maturing in successive years; rung k grows to (total ÷ rungs) × (1 + APY_k)^k. Investing $20,000 across rungs yielding 3.5%, 4.0%, 4.25% and more produces $22,813.10 at maturity, $2,813.10 of interest.
Enter the total to invest and the APY of each rung. The calculator returns the maturity value, interest earned and each rung's value.
Related tools: Inflation Calculator: Future cost or purchasing power using an average inflation rate you provide. Savings Calculator: Savings balance with regular monthly deposits. Emergency Fund Calculator: Emergency fund target and time to reach it.
How to use the CD Ladder Calculator
- Enter total to invest ($) (above 0).
- Type aPY of each rung (1-year, 2-year, …), for example 3.5, 4.0, 4.25.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Total to invest | A number, in $ | > 0 |
| APY of each rung (1-year, 2-year, …) | Text, such as 3.5, 4.0, 4.25 | — |
Formula and method
Formula
rung k value = (total ÷ rungs) × (1 + APY_k)^k
IEEE-754 double precision; shown to the decimals indicated.
Each rung is held to maturity with annual compounding at its APY; rates are entered by you.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Total to invest = 20000; APY of each rung (1-year, 2-year, …) = 3.5, 4.0, 4.25, 4.5, 4.75.
| Result | Value |
|---|---|
| Total at maturity | $22,813.10 |
| Interest earned | $2,813.10 |
| Value at each maturity | $4,140.00, $4,326.40, $4,531.98, $4,770.07, $5,044.64 |
Example 2
Inputs: Total to invest = 9000; APY of each rung (1-year, 2-year, …) = 4.2, 4.6, 4.9.
| Result | Value |
|---|---|
| Total at maturity | $9,871.31 |
| Interest earned | $871.31 |
| Value at each maturity | $3,126.00, $3,282.35, $3,462.96 |
The first line is the headline result (total at maturity). Below it the cD Ladder Calculator lists interest earned and value at each maturity, which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
Why ladder
A ladder gives access to a portion of the money each year and lets you reinvest maturing rungs at current rates. With rates rising it captures the increases; with rates falling the longer rungs lock in higher yields.
Rates are your input
No bank rates are built in; enter the APYs you can actually get. Early withdrawal usually costs interest, and deposits above deposit-insurance limits are not fully covered. Compounding is annual in this estimate.
How the result changes with total to invest
Holding every other input at the first worked example, this table changes only total to invest. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Total to invest | Total at maturity | Interest earned | Value at each maturity |
|---|---|---|---|
| 10000 | $11,406.55 | $1,406.55 | $2,070.00, $2,163.20, $2,265.99, $2,385.04, $2,522.32 |
| 20000 | $22,813.10 | $2,813.10 | $4,140.00, $4,326.40, $4,531.98, $4,770.07, $5,044.64 |
| 40000 | $45,626.19 | $5,626.19 | $8,280.00, $8,652.80, $9,063.96, $9,540.15, $10,089.28 |
| 80000 | $91,252.38 | $11,252.38 | $16,560.00, $17,305.60, $18,127.93, $19,080.30, $20,178.56 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- APY of each rung (1-year, 2-year, …): left empty shows "Enter apy of each rung (1-year, 2-year, …)." beside that field and no result.
- Total to invest: entering "0" shows "Total to invest must be greater than 0." beside that field and no result.
Choosing between the CD Ladder Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Inflation Calculator](/finance/inflation-calculator/) | amount today, average annual inflation and years | Future cost |
| [Savings Calculator](/finance/savings-calculator/) | initial amount, annual interest rate and years | Savings balance |
| [Emergency Fund Calculator](/finance/emergency-fund-calculator/) | essential monthly expenses and months of cover | Emergency fund target |
| [Savings Goal Calculator](/finance/savings-goal-calculator/) | savings goal, current savings and annual return | Monthly deposit needed |
| [Auto Loan Calculator](/finance/auto-loan-calculator/) | vehicle price, down payment and interest rate | Monthly payment |
Background: interest, saving and investing
A nominal rate (APR) does not include the effect of compounding; the annual percentage yield (APY) does: APY = (1 + r/n)^n − 1. A 5% nominal rate compounded annually is 5.000%, semi-annually about 5.063%, quarterly about 5.095% and monthly about 5.116%, so more frequent compounding helps, but with diminishing returns.
The rate you enter in a projection is an assumption, not a promise: real returns vary and can be negative. Fees and taxes are not modelled unless the page says so.
Assumptions and limitations
- Rates are not built in
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for aPY of each rung (1-year, 2-year, …) and total to invest to confirm this.
Frequently asked questions
How many rungs?
Commonly 3 to 5, one per year.
Is a ladder better than one CD?
It trades some yield for flexibility.
What happens when a rung matures?
Reinvest it at the longest term to keep the ladder.
What does the CD Ladder Calculator calculate?
Maturity values of a ladder of equal CDs with 1, 2, 3 … year terms. It returns Total at maturity, Interest earned and Value at each maturity.
What formula does the CD Ladder Calculator use?
rung k value = (total ÷ rungs) × (1 + APY_k)^k. Each rung is held to maturity with annual compounding at its APY; rates are entered by you.
What do I need to enter in the cD Ladder Calculator?
You enter Total to invest ($) and APY of each rung (1-year, 2-year, …).
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Rates are not built in.
What is an example of a cD Ladder result?
With total to invest 20000 and aPY of each rung (1-year, 2-year, …) 3.5, 4.0, 4.25, 4.5, 4.75, the total at maturity is $22,813.10.
Where does the method come from?
The method follows: OpenStax, Principles of Finance (Rice University): time value of money, annuities and loan amortization.
Can I rely on this calculator for a decision?
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser. For this calculator in particular: Rates are not built in.
Related calculators
- Inflation Calculator — Future cost or purchasing power using an average inflation rate you provide.
- Savings Calculator — Savings balance with regular monthly deposits.
- Emergency Fund Calculator — Emergency fund target and time to reach it.
- Savings Goal Calculator — Monthly deposit needed to reach a savings goal.
- Auto Loan Calculator — Monthly car payment after down payment and trade-in.
- Amortization Calculator — Full amortization schedule with optional extra monthly payments.
Sources
- OpenStax, Principles of Finance (Rice University): time value of money, annuities and loan amortization
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.