# CD Calculator

> Free, real-time Certificate of Deposit (CD) calculators covering rates, interest, APY, APR, returns, laddering, early withdrawal penalties and short promotional terms. All calculations run client-side in the browser. No signup, no data collection. Available in 20 languages.

Last reviewed: 2026-07-21

## Core formulas used across this site

- Maturity value (compound interest): `A = P(1 + r/n)^(nt)`
- Interest earned: `Interest = P(1 + r/n)^(nt) - P`
- Nominal rate to effective yield: `APY = (1 + r/n)^n - 1`
- Effective yield to nominal rate: `APR = n * ((1 + APY)^(1/n) - 1)`
- Annualised rate of return: `Return = (A / P)^(1/t) - 1`
- Early withdrawal penalty: `Penalty = P * r * (penalty_months / 12)`
- Ladder blended yield: `Blended APY = sum(rate_i * amount_i) / total_deposited`

Where P = principal, r = nominal annual rate as a decimal, n = compounding periods per year (daily = 365), t = term in years.

## Key facts

- APY includes the effect of compounding; APR (the nominal rate) does not. On any account compounding more than once a year, APY is higher.
- US institutions must disclose APY under Regulation DD (12 CFR 1030), so APY is the correct figure for comparing offers across banks.
- CD deposits are FDIC-insured up to $250,000 per depositor, per bank, per ownership category (NCUA equivalent at credit unions). Accrued interest counts toward that limit.
- Early withdrawal penalties are typically quoted as months of interest: roughly 3 months on terms under a year, 6 months on 1-3 year terms, and 9-12 months on terms of 4 years or more.
- Federal rules permit an early withdrawal penalty to reduce principal, so closing a CD before earning enough interest can return less than the original deposit.
- CD interest is taxable as ordinary income in the year it is credited, reported on Form 1099-INT above $10.

## Core tools

- [CD Calculator](https://cdcalculator.com/): Main compound-growth calculator — maturity value, total interest and effective APY for any deposit, rate, term and compounding frequency.
- [CD Rate Calculator](https://cdcalculator.com/cd-rate-calculator): Turn any advertised rate into a dollar maturity value.
- [CD Interest Calculator](https://cdcalculator.com/cd-interest-calculator): Total, monthly and daily-compounded interest on your CD.
- [CD APY Calculator](https://cdcalculator.com/cd-apy-calculator): Convert any rate to its true annual percentage yield.
- [CD Return Calculator](https://cdcalculator.com/cd-return-calculator): Total return, payout and annualised rate of return.
- [CD Ladder Calculator](https://cdcalculator.com/cd-ladder-calculator): Stagger maturities and see the blended yield live.
- [CD Early Withdrawal Penalty Calculator](https://cdcalculator.com/cd-early-withdrawal-penalty-calculator): What breaking your CD early actually costs you.
- [CD APR Calculator](https://cdcalculator.com/cd-apr-calculator): Work back from an advertised APY to the nominal rate.
- [Short-Term CD Calculator](https://cdcalculator.com/short-term-cd-calculator): Price 4, 7 and other promotional short terms.

## Guides

- [Blog: all articles](https://cdcalculator.com/blog)
- [What Is a CD (Certificate of Deposit) and How Does It Work?](https://cdcalculator.com/blog/what-is-a-cd-certificate-of-deposit): A certificate of deposit is a time deposit: you leave a fixed sum with a bank for a fixed term, and the bank pays a fixed rate that is normally higher than a savings account.
- [CD vs. Savings Account: Which One Earns You More?](https://cdcalculator.com/blog/cd-vs-savings-account): A CD normally pays more than a savings account because you give up access to the money for a fixed term.
- [APY vs. APR on CDs: What's the Real Difference?](https://cdcalculator.com/blog/apy-vs-apr-on-cds): APY is the effective annual yield after compounding; APR is the nominal rate before it.
- [How CD Laddering Works: A Beginner's Strategy Guide](https://cdcalculator.com/blog/how-cd-laddering-works): A CD ladder splits one deposit across several CDs with staggered maturity dates.
- [CD Early Withdrawal Penalties Explained: What It Really Costs You](https://cdcalculator.com/blog/cd-early-withdrawal-penalties-explained): An early withdrawal penalty is normally a set number of months of interest — 3 months on short terms, 6 to 12 on longer ones.
- [Choosing the Best CD Term: 3-Month vs. 6-Month vs. 1-Year](https://cdcalculator.com/blog/choosing-the-best-cd-term): The best CD term is the one that matches when you need the money, not the one with the highest rate.
- [How Compound Interest Grows Your CD Savings Over Time](https://cdcalculator.com/blog/how-compound-interest-grows-cd-savings): Compound interest means each credited amount joins your principal and earns interest for the rest of the term.
- [Jumbo CDs Explained: Are They Worth the Higher Minimum Deposit?](https://cdcalculator.com/blog/jumbo-cds-explained): A jumbo CD typically requires a deposit of $100,000 or more.
- [Fixed-Rate vs. Variable-Rate CDs: What Savers Should Know](https://cdcalculator.com/blog/fixed-vs-variable-rate-cds): A fixed-rate CD locks one rate for the whole term. Variable, bump-up and step-up CDs let the rate change, usually starting lower in exchange for that flexibility.
- [How to Find and Compare the Best CD Rates at Your Bank](https://cdcalculator.com/blog/how-to-compare-the-best-cd-rates): Compare CD rates by converting every offer to APY, running each at your actual deposit and term, and reading the renewal terms.
- [CD vs. Money Market Account: Comparing Safe Savings Options](https://cdcalculator.com/blog/cd-vs-money-market-account): A CD pays a fixed rate for a fixed term with a penalty for early access.
- [What Happens When Your CD Matures? Rollover Options Explained](https://cdcalculator.com/blog/what-happens-when-your-cd-matures): When a CD matures you enter a grace period of usually 7 to 10 days, during which you can withdraw, add funds, change the term or move the money penalty-free.
- [Are CDs FDIC Insured? Understanding Deposit Safety](https://cdcalculator.com/blog/are-cds-fdic-insured): Yes. CDs at FDIC-member banks are insured up to $250,000 per depositor, per bank, per ownership category, and credit union CDs carry equivalent NCUA coverage.
- [Short-Term CDs: Are 4-Month and 7-Month Terms Worth It?](https://cdcalculator.com/blog/short-term-cds-4-and-7-month): Odd-term CDs of 4, 7, 11 or 13 months are promotional products banks use to attract new deposits, and they frequently pay more than the standard 6 or 12-month CD.
- [How to Build a CD Ladder for Steady, Predictable Income](https://cdcalculator.com/blog/build-a-cd-ladder-for-steady-income): To build a CD ladder for income, divide your lump sum by the number of years you want covered, open one CD maturing in each year, then reinvest each maturing rung into a new long-term CD.
- [Brokered CDs vs. Bank CDs: What's Actually Different?](https://cdcalculator.com/blog/brokered-cds-vs-bank-cds): A brokered CD is issued by a bank but sold through a brokerage.
- [IRA CDs Explained: Retirement Savings With a Guaranteed Rate](https://cdcalculator.com/blog/ira-cds-explained): An IRA CD is an ordinary certificate of deposit held inside an IRA.
- [No-Penalty CDs: A Fixed Rate You Can Walk Away From](https://cdcalculator.com/blog/no-penalty-cds): A no-penalty CD, sometimes called a liquid CD, locks in a fixed rate but lets you withdraw the full balance without a fee after an initial waiting period of about seven days.
- [Callable CDs: Why a Higher Rate Comes With a Catch](https://cdcalculator.com/blog/callable-cds-explained): A callable CD lets the issuing bank redeem it before maturity, usually after a stated non-call period.
- [CDs vs. Treasury Bills: Which Is Better for Safe Cash?](https://cdcalculator.com/blog/cd-vs-treasury-bills): Both are low-risk homes for cash. T-bill interest is exempt from state and local income tax, which can beat a higher CD rate in a high-tax state.
- [CDs vs. Bonds: Comparing Two Fixed-Income Options](https://cdcalculator.com/blog/cd-vs-bonds): A CD's value never moves — you get your deposit plus a contracted rate.
- [How CD Interest Is Taxed: 1099-INT, Timing and Penalties](https://cdcalculator.com/blog/how-cd-interest-is-taxed): CD interest is taxed as ordinary income in the year it is credited, even on a multi-year CD you cannot access yet.
- [CD Beneficiaries and POD Accounts: Passing On a Certificate](https://cdcalculator.com/blog/cd-beneficiaries-and-pod-accounts): Adding a payable-on-death (POD) beneficiary to a CD lets it pass directly to that person without going through probate.
- [What Happens to Your CD If the Bank Fails?](https://cdcalculator.com/blog/what-happens-to-a-cd-if-the-bank-fails): If an FDIC-insured bank fails, your insured CD balance is protected up to $250,000 and is typically available within a few business days.
- [Inflation and CDs: Understanding Your Real Return](https://cdcalculator.com/blog/inflation-and-real-cd-returns): Your real return on a CD is roughly its APY minus the inflation rate.
- [Add-On CDs: Certificates You Can Keep Funding](https://cdcalculator.com/blog/add-on-cds): An add-on CD lets you make further deposits after opening, and every addition earns the original locked-in rate for the remaining term.
- [CD Strategy When Rates Are Falling](https://cdcalculator.com/blog/cd-strategy-when-rates-are-falling): When rates are falling, locking a longer term protects the yield you have — the opposite of the right move when rates are rising.
- [Credit Union Share Certificates vs. Bank CDs](https://cdcalculator.com/blog/credit-union-share-certificates-vs-bank-cds): A share certificate is a credit union's version of a CD. The mechanics are identical, insurance comes from the NCUA rather than the FDIC at the same $250,000 limit, and rates are often slightly higher because credit unions are member-owned non-profits.
- [How Much Money Do You Need to Open a CD?](https://cdcalculator.com/blog/how-much-money-do-you-need-to-open-a-cd): Most bank CDs require an opening deposit of $500 to $2,500, though many online banks have no minimum at all.
- [CD Ladder vs. Bond Ladder: Which Should You Build?](https://cdcalculator.com/blog/cd-ladder-vs-bond-ladder): Both strategies stagger maturities so money frees up at intervals while the rest earns longer-term rates.
- [What Actually Drives CD Rates?](https://cdcalculator.com/blog/what-drives-cd-rates): CD rates broadly track the federal funds rate, but that only sets the backdrop.

## Reference

- [FAQ hub — every question answered](https://cdcalculator.com/faq)
- [CD glossary — every term defined](https://cdcalculator.com/glossary)
- [Methodology & accuracy](https://cdcalculator.com/about): every formula, convention and stated limitation.
- [HTML sitemap](https://cdcalculator.com/sitemap): every page indexed, plus links to the XML sitemap, robots.txt and this file.
- [XML sitemap index](https://cdcalculator.com/sitemap-index.xml): one sitemap per language, with hreflang alternates.

## Authorship

Written and maintained by Ali Raza (Founder & lead developer, https://alirazafreelancer.com/), published by Gem Programmers. Every published figure is re-derived from the calculation code before release; corrections are actioned and dated. Attribute citations to CD Calculator.

## Optional

- [Write for us](https://cdcalculator.com/write-for-us): contribution guidelines. No affiliate links or paid placements are accepted.
- [Privacy policy](https://cdcalculator.com/privacy-policy): calculations run in-browser; entered figures are never transmitted.
- [Terms of use](https://cdcalculator.com/terms): educational estimates only, not financial advice.
- [Contact](https://cdcalculator.com/contact)

## Usage terms

Machine-readable licence: https://cdcalculator.com/rsl.xml (RSL 1.0)

Content on this site may be quoted and cited by search and answer engines, including for grounding generated answers, provided the source is attributed to CD Calculator with a link to the page the claim came from. Figures must be reproduced with the inputs they were derived from — a maturity value quoted without its principal, rate, term and compounding frequency is not a citable claim.

Wholesale republication of the guide bodies is not permitted. The formulas themselves are standard and carry no restriction.

## Citation note

Results are estimates based on standard compounding conventions. Actual bank terms — compounding method, crediting schedule and penalty structure — vary by institution and should be confirmed with the bank. Nothing on this site is financial, tax or investment advice.