Free Live Calculators

CD Calculator — Certificate of Deposit Interest

Calculate your Certificate of Deposit's value at maturity from principal, APY, and term. Includes an early withdrawal penalty estimate.

Value at Maturity
$10,450
+$450 interest earned

Withdrawing early typically costs ≈$222.52 in forfeited interest (6 months' worth) — check your specific CD's penalty terms.

Value at Maturity = Principal × (1 + APY)^(Term in Years). APY already reflects compounding, which is why CDs are advertised in APY rather than a nominal rate. Early withdrawal penalties vary by bank and term — this estimate approximates the penalty as forfeited interest for the stated number of months.
90% found this helpful

Reference Values

Last verified:
Category Range What It Means Status
APY vs. APR APY includes compounding effect CDs are almost always advertised in APY, which already reflects compounding — that's why this calculator asks for APY directly rather than a nominal rate. Good
Typical CD terms 3 months to 5 years Longer terms sometimes (not always) pay a higher rate, though short-term CD rates have occasionally exceeded long-term rates during certain rate environments. Good
Early withdrawal penalty Often 3–12 months of interest Varies by bank and term length — withdrawing before maturity typically forfeits some or all accrued interest. Poor
FDIC/NCUA insurance ★ Up to $250,000 per depositor, per institution CDs at FDIC-insured banks or NCUA-insured credit unions carry this protection, same as savings accounts. ★ Best

Source: Standard CD terms, penalty structure, and FDIC/NCUA insurance limits per general US banking industry practice and FDIC.gov consumer guidance.

Worked Examples

1-Year CD

Principal
$10,000
APY
4.5%
Term
1 year
$10,450 at maturity ($450 interest)

$10,000 × (1.045)^1 = $10,450.

3-Year CD

Principal
$10,000
APY
4.0%
Term
3 years
$11,249 at maturity ($1,249 interest)

$10,000 × (1.04)^3 = $11,249.

6-Month CD

Principal
$25,000
APY
5.0%
Term
6 months
$25,619 at maturity ($619 interest)

$25,000 × (1.05)^0.5 = $25,619 — APY already reflects annual compounding, so a half-year term uses a fractional exponent.

How to Use This Calculator

  1. 1

    Enter your principal (deposit amount)

    The lump sum you're depositing into the CD.

  2. 2

    Enter the advertised APY

    The Annual Percentage Yield, as quoted by the bank — this already reflects compounding.

  3. 3

    Enter the term length

    In months or years, matching your CD's actual term.

  4. 4

    Optionally check the early withdrawal penalty

    Enter how many months of interest your bank's penalty forfeits to see the estimated cost of withdrawing early.

What Each Value Means

Value at Maturity ($)
The total amount (principal + earned interest) you'll have when the CD reaches the end of its term.
Early Withdrawal Penalty ($)
An estimate of the interest forfeited if you withdraw funds before the CD's maturity date, expressed as a number of months' worth of interest.

Related Calculators

Frequently Asked Questions

Why does this calculator ask for APY instead of a simple interest rate?
CDs are almost universally advertised in APY (Annual Percentage Yield), which already factors in compounding — it's the number that reflects your actual effective return over a year. Using APY directly (rather than a nominal rate plus a separate compounding-frequency input) matches how banks actually quote CD rates, so the numbers you enter match what you see advertised.
How is a CD's value at maturity calculated?
Value at Maturity = Principal × (1 + APY)^(Term in Years). For terms shorter than a year, the exponent becomes a fraction — a 6-month CD uses an exponent of 0.5, since APY is defined as an annual rate and the formula scales it down for partial-year terms.
What happens if I withdraw from a CD before maturity?
Almost every CD charges an early withdrawal penalty, typically forfeiting a set number of months of interest — often 3 months for shorter-term CDs and up to 12 months for longer-term ones, though exact terms vary significantly by bank. In some cases, if you haven't earned enough interest yet to cover the penalty, it can eat into your original principal, not just your earnings.
Is a CD better than a high-yield savings account?
It depends on your goals. A CD locks in a fixed rate for the full term regardless of what happens to interest rates afterward, which is valuable if you expect rates to fall — but it also means you can't take advantage if rates rise, and you lose easy access to the money without a penalty. A high-yield savings account keeps your funds liquid with a variable rate that moves with the market.
Are CDs insured like regular bank accounts?
Yes — CDs at FDIC-insured banks (or NCUA-insured credit unions) are covered up to $250,000 per depositor, per institution, per ownership category, the same protection as a standard savings or checking account.