CD Calculator (Certificate of Deposit)
See how a US Certificate of Deposit grows — enter the principal, APY and term in months to get the maturity value and interest earned with monthly compounding.
What is a CD calculator?
A CD calculator (certificate of deposit calculator) works out what a US CD will be worth at maturity and how much interest it earns. A certificate of deposit is a bank savings product where you deposit a lump sum for a fixed term — commonly 6 to 60 months — at a set interest rate. In exchange for leaving your money untouched, the bank pays a higher, fixed, predictable rate than a regular savings account. This free CD calculator takes three inputs: your principal, the APY (annual percentage yield) and the term in months.
It then compounds the interest monthly to show the maturity value and the total interest earned. Because the rate is fixed and CDs are FDIC-insured, the result is a dependable projection, which makes it easy to compare different terms and rates before you commit money you do not need soon.
How to use
- Enter the principal amount you will deposit.
- Set the APY or annual rate the bank offers.
- Enter the CD term in months.
- Click Calculate CD to see the maturity value and interest earned.
How CD maturity is calculated
Maturity = P × (1 + APY/12)^(months)
The APY is divided by 12 for monthly compounding, and interest is added to the balance each month so that it compounds. The maturity value is your principal plus all the compounded interest earned over the full term.
Example
With the defaults — $10,000 at 4.5% APY over a 12 month term — clicking Calculate CD gives a maturity value of about $10,459 and $459 in interest earned. Now extend the term to 24 months at the same rate and the interest jumps to roughly $940. That shows how both a longer term and a higher rate increase your return.
Common use cases
- Compare offers: see how different banks' APYs and terms change the maturity value.
- Laddering: stagger CDs of different terms to keep money maturing regularly.
- Safe savings: earn a predictable fixed return on money you will not need soon.
- Short-term goals: plan a known total for a purchase a few years out.
Pro tips
- Watch for early-withdrawal penalties: only deposit money you can leave for the whole term.
- Compare APY, not just rate: APY reflects compounding, so it is the fairer number to compare.
- Consider a CD ladder: staggering maturities keeps money accessible and locks in current rates.
- FDIC insurance: CDs are insured up to $250,000 per depositor per bank.
FAQ
What is a certificate of deposit?
A CD is a savings vehicle where you lock in a lump sum for a fixed term at a set interest rate, earning a predictable return at maturity.
What is APY?
APY is the annual percentage yield, the real annual return including the effect of compounding. It is the number banks advertise and use to compare CDs.
How is CD maturity value calculated?
Maturity = P x (1 + APY/12)^months. Interest compounds monthly, so the maturity value is the principal plus the compounded interest earned.
How often do CDs compound?
Most CDs compound interest on a set schedule, commonly monthly or daily, which is why a CD's APY can be slightly higher than its stated rate.
Are CDs safe?
CDs are generally very safe. They are FDIC-insured up to the $250,000 limit per depositor per bank, and the rate is fixed until maturity.
Can I withdraw my CD early?
Usually yes, but there is an early withdrawal penalty, often a few months' interest, which can eat into your earnings.
How much should I put into a CD?
Only money you will not need for the whole term, since withdrawing early means a penalty. Many people use CDs for a short-term savings goal.
Are CD rates fixed?
Yes, a CD's rate is locked in at opening and stays fixed for the entire term, so your return is predictable regardless of market moves.
What happens when a CD matures?
The bank pays you the principal plus interest, or rolls the money into a new CD automatically unless you tell it to do otherwise.
Is this CD calculator free?
Yes. It runs entirely in your browser and no data is uploaded anywhere.
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