Annual Percentage Yield is the effective yearly return including compounding, making it the best figure for comparing CDs and savings accounts.

Home/Calculators/CD Calculator

Savings

CD Calculator

Q: How is CD interest calculated?

Your deposit grows at the APY, compounded at the chosen frequency, over the term. The maturity value is your deposit plus all accumulated interest.

Q: Can I withdraw from a CD early?

Usually yes, but most CDs charge an early-withdrawal penalty, often several months of interest. Choose a term you can commit to.

Calculate the maturity value and interest earned on a certificate of deposit based on your deposit, APY, and term.

Built by the RiskCalcPro finance team Method reviewed Updated August 2026

Deposit Amount ($)

APY (%)

Term (months)

Compounding

At Maturity

Maturity Value

—

Interest Earned

—

Effective APY

—

CDs vs savings

CDs usually pay more than regular savings in exchange for locking your money for a set term. Withdrawing early typically incurs a penalty.

CD laddering

Splitting money across CDs of staggered terms gives you periodic access to funds while capturing higher long-term rates.

Understanding certificates of deposit (CDs)

A certificate of deposit is a savings product where you agree to lock up a fixed sum for a set term — a few months to several years — in exchange for a guaranteed interest rate. Because you commit to leaving the money untouched, CDs typically pay more than regular savings accounts. This calculator shows how much your CD will be worth at maturity and how much interest you will earn.

CDs are prized for predictability and safety. The rate is fixed, the return is known in advance, and at federally insured banks and credit unions your deposit is protected up to the insurance limit. The trade-off is access: withdrawing early usually triggers a penalty.

How CD earnings are calculated

CDs use compound interest. Your maturity value depends on the deposit, the annual percentage yield (APY), the compounding frequency, and the term:

A = P (1 + r/n)^nt

Where P is your deposit, r is the annual rate, n is compounding periods per year, and t is the term in years. APY already reflects compounding, which is why it is the fairest number for comparing CDs.

A worked example

Deposit $20,000 into a 3-year CD at 4.5% APY, compounded monthly:

Figure	Value
Deposit	$20,000
Value at maturity	~$22,890
Interest earned	~$2,890

The return is guaranteed the day you open it — no market risk, no surprises. The cost is that the $20,000 is committed for three years unless you pay an early-withdrawal penalty.

CD laddering: Instead of locking all your money into one CD, split it across several with staggered terms (e.g., 1, 2, 3, 4, and 5 years). As each matures, you reinvest it into a new long-term CD. This gives you regular access to a portion of your money while still capturing the higher rates of longer terms — a popular way to balance yield and liquidity.

CDs vs other savings options

vs high-yield savings

Savings accounts let you withdraw anytime but have variable rates that can drop. CDs lock your rate, protecting you if rates fall — but you cannot easily access the money.

vs bonds

CDs are simpler and federally insured up to limits, while bonds can offer higher returns with more risk and price fluctuation.

Early withdrawal

Pulling money out before maturity typically costs several months of interest. Only commit money you are confident you will not need during the term.

Common mistakes to avoid

Locking up money you might need. Keep your emergency fund liquid; use CDs only for money you can leave alone.
Ignoring APY vs rate. Compare CDs by APY, which includes compounding, not the nominal rate.
Auto-renewing without checking. Many CDs roll over at maturity, sometimes into a lower rate. Review before the grace period ends.
Choosing a long term when rates may rise. Laddering hedges against locking in at the wrong time.

Frequently asked questions

How is CD interest calculated?

CDs use compound interest based on your deposit, the APY, the compounding frequency, and the term. The APY already reflects compounding, making it the best figure for comparing CDs.

What happens if I withdraw early?

Most CDs charge an early-withdrawal penalty, often several months of interest. Only deposit money you are confident you will not need before the term ends.

Are CDs safe?

CDs at federally insured banks and credit unions are protected up to the insurance limit, and the rate is fixed, making them one of the lowest-risk savings options available.

What is a CD ladder?

A ladder splits your money across CDs with staggered maturities. As each matures you reinvest it long term, giving you periodic access to funds while capturing higher long-term rates.

Should I choose a CD or a high-yield savings account?

Choose a CD to lock in a rate on money you will not touch. Choose high-yield savings for money you may need access to, accepting that its rate can change over time.

Sources & references

FDIC — certificates of deposit and deposit insurance · fdic.gov
Consumer Financial Protection Bureau — CDs and savings products · consumerfinance.gov

Estimates are for educational purposes only and are not financial advice. Rates and penalties vary by institution.