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CD Ladder Calculator

Find your CD's maturity value and interest

How it is calculated

The tool values one certificate of deposit with maturity = principal × (1 + APY/100)years and interest = maturity − principal. The principal is the amount deposited, APY is the annual percentage yield as a percent (4.5 means 4.5%) and years is the term. Because APY already includes the bank's compounding schedule, the formula needs no separate compounding frequency. A term may be fractional, such as 0.5 for six months, because the exponent is used as entered; banks may calculate short terms differently. Principal and years must be above zero and APY cannot be negative. Despite the name, the tool values one CD at a time and does not split money into rungs; to plan a ladder, run it once per rung. Taxes are not deducted.

Worked example

You put 10,000 into a 3-year CD at 4.5% APY. Step 1: 1.0453 = 1.14117. Step 2: 10,000 × 1.14117 = $11,411.66 at maturity. Step 3: interest earned = 11,411.66 − 10,000 = $1,411.66. For a simple ladder you could run the tool again for another rung, for instance a 1-year CD with a different APY, and add the results.

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Common mistakes

  • Entering the rate as a decimal (0.045). The field expects a percent, so 0.045 is read as 0.045% and the interest almost disappears.
  • Using the nominal rate (APR) quoted by the bank when the APY is what the tool needs. If the CD compounds monthly, the APY is slightly higher than the APR, so using the APR understates the result a little.
  • Expecting the tool to build a whole ladder. It treats the amount as one CD, so putting your total savings in the principal field does not stagger maturities.
  • Ignoring early-withdrawal penalties and taxes. The maturity value assumes you hold the CD to the end and does not subtract either.
  • Entering the term in months. Years is the unit, so a 36-month CD is 3, and an 18-month CD is 1.5.

Sources

About this calculator

This calculator applies standard compound interest to a single certificate of deposit: A = P × (1 + APY)^t, where P is the amount deposited, APY is the bank's stated annual percentage yield, and t is the term in years. Because APY already folds in the compounding frequency, each year's interest builds on the growing balance rather than just the original principal.

Savers use it to compare a bank's advertised CD rates against a plain savings account, and it's a building block for a CD ladder — splitting money across several CDs with staggered maturity dates (say 1, 2, 3 and 4 years) so a portion becomes accessible every year while the rest keeps earning the higher long-term rate. The tool values one CD at a time, so to model a ladder, run each rung with its own amount, APY and term and add the results together.

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Comments (1)

  • Editorial team

    The tool prices one certificate at a time, so a ladder is built by running it once per rung and keeping the rung results apart. Splitting 30,000 into three equal parts with one, two and three year terms gives three maturity values that arrive on three different dates, so adding them together mixes dates. Early-withdrawal penalties are not included. How many rungs and what term lengths does your plan use?

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