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Free CD Calculator — Certificate of Deposit Earnings

Calculate how much your certificate of deposit will earn based on deposit amount, APY, term length, and compounding frequency.

Use this free CD calculator to find your exact certificate of deposit maturity value, total interest earned, and effective annual yield. Compare different CD terms and rates side-by-side to find the best CD for your savings goals. No sign-up required.

What Is a Certificate of Deposit (CD)?

A certificate of deposit (CD) is a federally insured savings product offered by banks and credit unions that pays a fixed interest rate for a fixed term — typically 3 months to 5 years. In exchange for locking up your money for the agreed term, CDs offer higher rates than regular savings accounts.

CDs are one of the safest investments available because they are FDIC-insured up to $250,000 per depositor, per institution. Whether rates rise or fall during your term, your locked-in APY is guaranteed — making CDs ideal for short-to-medium term savings goals.

Unlike a high-yield savings account (HYSA), a CD's rate does not change with the market. If you open a 1-year CD at 5.35% APY today, you earn exactly 5.35% regardless of what the Federal Reserve does with interest rates over the next 12 months. Use our savings goal calculator to see how a CD fits into your overall savings plan.

How to Use This CD Calculator

  1. 1

    Enter Your Deposit Amount

    Type in the amount you plan to deposit — your principal. This is the lump sum you will lock into the CD. Most CDs require a $500–$1,000 minimum deposit, though some have no minimum.

  2. 2

    Enter the APY

    Enter the Annual Percentage Yield (APY) offered by the CD. Always use APY — not APR — because APY already accounts for the effect of compounding and makes different CDs directly comparable.

  3. 3

    Select the Term Length

    Choose your CD term in months or years. Common terms are 3, 6, 12, 18, 24, and 60 months. Longer terms often offer higher rates but lock your funds for a longer period.

  4. 4

    Choose Compounding Frequency

    Select how often interest compounds — daily, monthly, quarterly, or annually. Daily compounding yields slightly more than monthly or annual. Most online bank CDs compound daily.

CD Interest Formula

Maturity Value = P × (1 + r/n)^(n×t)
  • P = Principal (initial deposit)
  • r = Annual interest rate (decimal, e.g. 0.0535 for 5.35%)
  • n = Compounding periods per year (365 = daily, 12 = monthly, 4 = quarterly, 1 = annually)
  • t = Term in years

Example: $10,000 at 5.25% APY for 6 months, compounded daily: $10,000 × (1 + 0.0525/365)^(365×0.5) = $10,262.50

Note: When a bank quotes APY, the compounding effect is already built in. To compare CDs accurately, always compare APY values directly rather than APR or stated rates.

CD Calculator Examples (2024 Rates)

Real-world examples using competitive 2024 CD rates from top online banks.

Conservative: 6-Month CD at 5.25% APY

$10,000 deposited in a 6-month CD at 5.25% APY (FDIC insured) earns $262.50 in interest, growing to a total maturity value of $10,262.50. Ideal for emergency fund overflow or near-term savings goals within 6 months.

Standard: 1-Year CD at 5.35% APY

$25,000 in a 1-year CD at 5.35% APY earns $1,337.50 in interest, maturing at $26,337.50. The 1-year term is the most popular CD choice, offering near-peak rates with only a 12-month lock-up — a strong option for funds not needed for a year.

Growth: 5-Year CD at 4.50% APY (Daily Compounding)

$50,000 in a 5-year CD at 4.50% APY compounded daily grows to $62,388 at maturity, earning $12,388 in total interest. The 5-year lock-in makes sense if you believe rates will fall — you secure today's rate for the entire term while competitors earn lower yields.

Frequently Asked Questions

What is a certificate of deposit (CD)?
A certificate of deposit (CD) is a federally insured savings product offered by banks and credit unions. You deposit a fixed amount for a fixed term — typically 3 months to 5 years — and earn a guaranteed interest rate. In exchange for locking up your funds, CDs pay higher rates than regular savings or checking accounts. CDs are FDIC-insured up to $250,000 per depositor, per institution.
How do CD rates compare to high-yield savings accounts (HYSA)?
CDs and HYSAs both offer competitive rates, but they work differently. CDs lock your money for a fixed term at a fixed rate — ideal when you want rate certainty and won't need the funds. HYSAs offer variable rates and instant liquidity. In 2024, top CDs often pay 5.0–5.50% APY while HYSAs pay 4.5–5.0%. If you expect rates to fall, locking into a CD now protects your yield.
What are the best CD rates in 2024?
As of 2024, top online banks and credit unions are offering 5.00–5.50% APY on 6-month to 1-year CDs. 5-year CDs typically yield 4.25–4.75% APY. The best rates come from online-only institutions like Ally, Marcus, Discover, and credit unions. Always compare APY (not APR) since APY already accounts for compounding frequency.
What is the CD early withdrawal penalty?
Most CDs charge an early withdrawal penalty if you pull funds before the term ends. Typical penalties range from 60 days of interest for short-term CDs to 150–365 days of interest for long-term CDs. Some "no-penalty CDs" waive this fee but usually offer slightly lower rates. Always read the fine print before opening a CD if you think you might need the funds early.
What is a CD ladder strategy?
A CD ladder splits your deposit across multiple CDs with staggered maturity dates. For example, divide $20,000 into four $5,000 CDs maturing in 6, 12, 18, and 24 months. As each CD matures you can either use the funds or reinvest at current rates. Laddering reduces interest-rate risk, maintains regular access to funds, and smooths out rate fluctuations over time.
How does FDIC insurance protect my CD?
CDs at FDIC-member banks are insured up to $250,000 per depositor, per institution, per ownership category. This means your CD principal and accrued interest are protected even if the bank fails. Credit union CDs receive equivalent coverage from the NCUA. To maximize coverage above $250,000, spread funds across multiple FDIC-member institutions or use different ownership categories (individual, joint, retirement).

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