CD Calculator

How this result is built

Project a certificate of deposit from its APY and term in months.

Certificate of deposit ads quote APY because it already includes compounding. You do not need to guess whether the bank compounds daily. The maturity value is the deposit grown by that APY for the fraction of a year the term covers.

What the opening example is for

Early withdrawal penalties are not subtracted. If you might break the CD, the maturity value is a ceiling, not the cash you would receive.

The walkthrough below uses the numbers already sitting in CD Calculator. Press Calculate and the headline should match this page. Then put your own figures in. The math does not run until you press the button, and Clear hides the result.

What each field is doing

The “Deposit” line on CD Calculator starts at $10,000.00. If the label is a rate, type the annual figure the contract uses. If it is money, type the amount that will actually move, not a rounded hope.

CD Calculator treats “APY” as its own entry, and the form opens with 4.25%. Leave that figure only when it matches the statement, the quote, or the plan you are testing. Press Calculate after the edit so the chart and the schedule move with it.

Before you replace it, “Term” reads 12 on CD Calculator. A round example is useful for learning the page. It is a poor substitute for the number on your own paperwork, so replace it and run the form again.

The opening result, line by line

Press Calculate on the opening form and Value at maturity is $10,425.00. That is the number the rest of this section is talking about.

Interest earned is $425.00 when you run the opening figures on CD Calculator. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

On this opening pass, aPY is 4.25%. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

How those lines were produced

CD Calculator reports that term is 12. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

Enter APY, which already reflects compounding. A nominal rate would grow differently.

A second pass changes only “Deposit”, from $10,000.00 to $11,000.00. Value at maturity moves from $10,425.00 to $11,467.50. Nothing else on the form was edited, so the gap between those two results is the effect of that one field on CD Calculator. If the gap is tiny, this page is not very sensitive to that entry. If the gap is large, get that entry from a document before you plan around the result.

What this page will not claim

CD Calculator compounds the rate you type. Markets do not pay a flat rate, and a fund fee comes out of the return before you should type it. The page is the equation, not a forecast and not a recommendation to buy or sell.

CD Calculator stops at its own formula. When the next question is different, open Compound Interest Calculator (Interest that starts earning interest of its own.); Savings Calculator (What a monthly deposit becomes.); Interest Calculator (A direct answer to how much interest you earn.). Do not add those results to this one as if they were the same kind of dollar.

Check the result before you use it

Start on CD Calculator by reading the labels, not the headline. The opening labels are Deposit ($10,000.00), APY (4.25%), Term (12). If a label is not the fact you have, the result cannot turn into that fact later. The illustration on the form lands on $10,425.00. When you press Calculate and see that same figure, the button and this explanation are using one formula.

Change one field at a time. Write down the headline, edit a single line, and press Calculate again. A large jump means that line carries the result. A line that does not move is a line the formula ignores, which is a reason to confirm you opened the right page. CD Calculator is built for one job: APY in, value at maturity out. The description on the page says the same thing in a sentence: Project a certificate of deposit from its APY and term in months.

When the paperwork disagrees

Then hold the headline next to a source outside the site. That source might be a loan estimate, an account statement, a pay stub, or the public limit named in the methodology. A few cents of difference on a long schedule is ordinary rounding. A different rate, a fee you never typed, or a tax the form does not ask for is not rounding. Correct the input. Do not average the page with the paperwork.

When the outside source still disagrees, CD Calculator has reached the edge of what it will claim. It will not phone a lender, pull a county record, or apply a credit you left blank. Send the calculator name, every input, and the result you expected through the contact page if you think the formula itself is wrong. Until that is settled, read $10,425.00 as the output of the fields above and nothing else.

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