Cd CalculatorHow to use the CD calculator
Enter the initial deposit, APY, CD term and start date, then select Calculate. Add federal tax, state tax or inflation only when you want an after-tax or purchasing-power estimate.
CD Calculator
Estimate your CD's maturity value, interest earned and after-tax return. Fast, private and free—no signup required.
Private calculationYour inputs stay in your browser.No signupUse the calculator instantly.Estimate onlyVerify terms with the institution.
Estimated maturity balance
In 12 months
Total interest earned$400.00
Average interest per month$33.33
Projected balance growth
Starting deposit $10,000.00Projected maturity $10,400.00Interest earned $400.00
Balance Interest above starting deposit
Maturity schedule
Showing the default monthly schedule for this term.
| Period | Starting balance | Interest earned | Ending balance |
|---|---|---|---|
| Month 1 | $10,000.00 | $32.74 | $10,032.74 |
| Month 2 | $10,032.74 | $32.84 | $10,065.58 |
| Month 3 | $10,065.58 | $32.95 | $10,098.53 |
| Month 4 | $10,098.53 | $33.06 | $10,131.59 |
| Month 5 | $10,131.59 | $33.17 | $10,164.76 |
| Month 6 | $10,164.76 | $33.28 | $10,198.04 |
| Month 7 | $10,198.04 | $33.39 | $10,231.42 |
| Month 8 | $10,231.42 | $33.50 | $10,264.92 |
| Month 9 | $10,264.92 | $33.60 | $10,298.52 |
| Month 10 | $10,298.52 | $33.71 | $10,332.24 |
| Month 11 | $10,332.24 | $33.83 | $10,366.06 |
| Month 12 | $10,366.06 | $33.94 | $10,400.00 |
This calculator provides estimates for educational purposes only. It is not a bank quote, tax advice, legal advice or personalized financial advice. Actual earnings and penalties depend on the financial institution's terms, compounding method, dates, taxes and rounding.
Formula and assumptions
This CD interest calculator estimates maturity balance with this APY-based formula: maturity balance = principal × (1 + APY) raised to the term in years. APY already reflects compounding over one year, so this calculator does not ask for a separate compounding frequency in the basic estimate.
Actual bank calculations may differ because of account-specific compounding, day-count conventions, deposit dates, fees, taxes, early-withdrawal penalties and rounding.
Input glossary
- Initial deposit is the amount placed into the CD before interest.
- APY is the annual percentage yield used to estimate annual growth.
- CD term is the length of time funds are assumed to stay deposited.
- Start date is used to estimate the maturity date shown in the result.
Example CD scenarios
A 12-month CD is often used for short-term savings goals. A 24- or 36-month CD can show how a longer lockup changes interest earned. Use the CD comparison calculator when two offers have different APYs or terms.
Common CD calculator mistakes
- Comparing CDs with different terms without considering liquidity.
- Treating a promotional APY as guaranteed before reading the account terms.
- Ignoring taxes when the estimate is being used for after-tax planning.
- Assuming early withdrawal will never reduce interest or principal.
Estimate limitations
The result is not a bank quote or personalized advice. Verify APY, compounding rules, grace period, automatic renewal terms, penalties and insurance coverage directly with the financial institution before making a deposit decision.
Need more context? Read how CDs work or learn what APY means.
This calculator provides estimates for educational purposes only. It is not a bank quote, tax advice, legal advice or personalized financial advice. Actual earnings and penalties depend on the financial institution's terms, compounding method, dates, taxes and rounding.
Understand the assumptions
Certificate of deposit guide
How to use the CD calculator
Enter an initial deposit, APY, CD term and start date. Add taxes or inflation only if you want after-tax or purchasing-power estimates.
How CD interest is calculated
The estimate uses APY directly: maturity balance equals principal times (1 + APY) raised to the term in years.
APY versus interest rate
APY includes compounding over one year. This V1 calculator does not ask for compounding frequency because APY already reflects it.
How taxes affect CD interest
The tax estimate applies the combined tax rate only to interest earned, not to principal. It is educational and not tax advice.
How inflation affects CD returns
Inflation-adjusted values estimate what the ending balance may be worth in today's purchasing power under your assumed inflation rate.
What happens at maturity
At maturity, many institutions provide a grace period to withdraw, renew or move funds. Check the CD agreement for exact terms.
Early-withdrawal penalties
Breaking a CD before maturity may forfeit interest and can reduce principal when the penalty is larger than accrued interest.
CD versus high-yield savings
CD rates are usually fixed for the term. Savings rates can change, but savings accounts usually offer easier access to funds.
Limitations of the estimate
Actual bank calculations may differ because of compounding method, day-count conventions, deposit dates, fees, taxes and rounding.
Questions before you compare CD terms
Frequently asked questions
How much will a $10,000 CD earn?
A $10,000 CD at 4.00% APY for 12 months is estimated to earn $400.00 before taxes. Actual earnings can differ by institution terms, dates and rounding.
What is a CD maturity value?
CD maturity value is the estimated ending balance after the CD term ends. It includes the original deposit plus interest earned before any taxes, penalties or fees.
How is CD interest calculated?
This calculator estimates CD growth from APY using principal multiplied by (1 + APY) raised to the term in years.
Does this CD interest calculator use APY?
Yes. The calculator uses APY because APY reflects annual yield including compounding. That makes it useful for estimating CD interest without asking for a separate compounding frequency.
Is CD interest compounded monthly or daily?
APY already reflects the effect of compounding over one year. Banks may use different compounding and day-count methods.
Is CD interest taxable?
CD interest is generally taxable as ordinary income, but timing and treatment vary. This calculator is not tax advice.
Can a CD lose money?
A traditional bank CD is designed to preserve principal when held to maturity, but early withdrawal penalties can reduce earnings and may reduce principal depending on account terms.
What happens if I withdraw from a CD early?
Many CDs charge an early-withdrawal penalty, often based on days or months of interest. The exact penalty depends on the financial institution.
What happens when a CD matures?
At maturity, the institution typically lets you withdraw funds, renew the CD or move the money during a grace period. Terms vary.
Is APY the same as an interest rate?
APY reflects annual yield including compounding. A stated interest rate or APR may not be identical to APY.
Is a CD better than a high-yield savings account?
A CD may offer a fixed rate for a term, while savings rates can change and usually offer more liquidity. The better fit depends on assumptions and needs.
Are CDs FDIC insured?
Many bank CDs are FDIC insured when issued by an FDIC-insured institution and within applicable limits. Coverage depends on eligibility and ownership category.
Does this calculator recommend a bank or CD?
No. Cd Calculator explains estimates and assumptions only. It does not recommend a bank, credit union, brokered CD or financial product.