OOmniwidgets

Certificate of Deposit APY Tool

CD Rate Calculator

Calculate CD interest, maturity value, APY, and return. Compare terms, reverse-calculate APY, and estimate whether an early withdrawal penalty could erase the benefit of switching CDs.

CD Planning Tool

Calculate a CD Before You Open It

Estimate maturity value, interest earned, and after-tax interest.

$
Deposit Amount slider
100$100,000
mo
Term in Months slider
160 months
%
CD APY slider
010%
%
Estimated Tax Rate slider
045%

CD Result

Updates instantly as you adjust the inputs.

6 mo
Maturity value
$10,246.95
Interest earned
$246.95
After-tax interest estimate
$246.95
Monthly equivalent$41.16
APY5.000%
Term6 months

Start with the Question You Need Answered

Most CD searches are not just about a formula. Users want to know how much a deposit will earn, whether one APY beats another offer, what rate is implied by a maturity quote, or whether breaking an old CD makes sense after a penalty.

How This CD Rate Calculator Works

Enter a deposit amount, APY, and term length to estimate maturity value and interest earned. The calculator also includes rate comparison, reverse APY, and early withdrawal penalty scenarios so you can compare CD offers more clearly.

CD Interest Formula

Using APY: final balance = deposit x (1 + APY)years.

Interest earned: maturity value - original deposit.

Reverse APY: APY = (maturity value / deposit)1 / years - 1.

Compare CD Rates by Term

A higher APY does not always mean the best total outcome if the term is different. A 3 month CD may provide quicker access and reinvestment flexibility, while a 5 year CD may lock in a rate for longer but reduce liquidity.

Reverse CD Rate Calculator

If you know the deposit, maturity value, and term, reverse APY helps estimate the annual percentage yield implied by the final balance. This is useful when comparing promotional CD examples or checking whether an advertised return matches the math.

Early Withdrawal Penalty Calculator

Early withdrawal penalties can reduce or eliminate the benefit of switching to a higher-rate CD. The penalty mode estimates a simple penalty based on months of interest, then compares keeping the current CD with switching to a new APY for the remaining term.

CD Rates, APY, Taxes, and Insurance

APY Includes Compounding

It is usually better for comparing CD offers than a simple stated interest rate.

Interest May Be Taxable

CD interest is commonly treated as taxable interest income, but tax rules depend on your situation.

Insurance Has Limits

Check FDIC or NCUA coverage rules and ownership categories for your bank or credit union.

Rates Change Often

This page estimates returns from the APY you enter; it does not maintain live rate tables.

CD Ladder Strategy

A CD ladder splits money across multiple maturities, such as 3 month, 6 month, 12 month, and longer CDs. This can improve access to cash while still letting part of the money earn longer-term rates.

Frequently Asked Questions

How much will $10,000 make in a 6 month CD?+

A $10,000 CD at 5% APY for 6 months earns about $247 before taxes. The exact amount depends on APY, term length, compounding, fees, and early withdrawal rules.

How do you calculate CD interest rate?+

Use the compound interest formula or reverse-calculate APY from deposit, maturity value, and term. APY is usually best for comparing CDs because it includes compounding.

Is APY the same as a CD interest rate?+

Not always. APY includes compounding and shows annualized yield. A stated interest rate may not include the full effect of daily or monthly compounding.

Is a 5 year CD better than a 6 month CD?+

It depends on APY, liquidity needs, early withdrawal penalty, and rate expectations. A 5 year CD locks money longer, while a 6 month CD gives faster reinvestment flexibility.

Does this calculator show the best CD rate today?+

No. This calculator estimates earnings from rates you enter. CD rates change by bank, date, term, deposit amount, and account rules, so check current bank disclosures.