CD calculator for interest, APY and maturity value
Enter deposit, stated annual rate, term and compounding frequency. HitEquals reports maturity value, interest earned, equivalent APY and optional tax and inflation estimates.
Inputs used by this calculator
CD Calculator uses the fields below. The starting values reproduce the page example; replace them with values from the same units and time period before using the result.
| Input | Starting example | Accepted value | How it is used |
|---|---|---|---|
| Initial deposit (USD) | 25,000 | 0 to 1000000000000 | Supplies the initial deposit (usd) quantity used by the published equation or result breakdown. |
| Annual interest rate (%) | 4.5 | 0 to 100 | Supplies the annual interest rate (%) quantity used by the published equation or result breakdown. |
| Term (months) | 12 | 1 to 600 | Supplies the term (months) quantity used by the published equation or result breakdown. |
| Compounding | Monthly — 12/year | Daily — 365/year · Monthly — 12/year · Quarterly — 4/year · Annually — 1/year | Supplies the compounding quantity used by the published equation or result breakdown. |
| Tax rate on interest (%) | 0 | 0 to 100 | Supplies the tax rate on interest (%) quantity used by the published equation or result breakdown. |
| Expected annual inflation (%) | 2.5 | 0 to 50 | Supplies the expected annual inflation (%) quantity used by the published equation or result breakdown. |
How a CD earns interest
A fixed-rate CD generally pays interest while money remains deposited for an agreed term. More frequent compounding adds earned interest to the balance sooner.
CD compound-interest formula
The nominal annual rate is divided by the number of compounding periods.
A=P(1+r/n)^(nt)APY=(1+r/n)ⁿ−1Rate versus APY
The stated rate is the nominal input. APY incorporates compounding and provides a one-year comparison measure under the same balance assumptions.
Early withdrawal and renewal
FDIC guidance recommends reading the deposit agreement. Withdrawing before maturity can trigger a penalty, and automatic renewal may use a new rate or term.
Deposit insurance and tax
Certificates of deposit at FDIC-insured banks are deposit products, but coverage depends on bank and ownership category. Interest tax treatment depends on the saver; the entered tax rate is only a scenario.
What the CD Calculator answers
Calculate certificate of deposit maturity value, APY, interest, tax and inflation effects.
Use CD Calculator when you know Initial deposit (USD), Annual interest rate (%), Term (months), Compounding, Tax rate on interest (%) and Expected annual inflation (%) and need the relationship expressed by the published equation.
Compounding choices
| Frequency | Periods/year |
|---|---|
| Daily | 365 |
| Monthly | 12 |
| Quarterly | 4 |
| Annually | 1 |
Frequently asked questions
Is a CD the same as a savings account?
Both are deposits, but a CD normally requires leaving funds for a specified term.
What is APY?
It is the annual percentage yield after compounding.
Are early-withdrawal penalties included?
No. Apply the institution's stated penalty separately.
Does FDIC insurance cover every CD?
Coverage requires an FDIC-insured bank and depends on ownership category and balances.
Is interest tax included?
Only as an optional estimate using the rate you enter.
What question does this CD Calculator answer?
Calculate certificate of deposit maturity value, APY, interest, tax and inflation effects.
What to keep in mind
Assumes a fixed rate and no withdrawals. Early-withdrawal penalties, renewal terms and bank-specific day counts are excluded.
Results are rounded for display in US format, with money in dollars and cents; CSV exports keep full calculation precision. This is a calculation summary, not an official certificate.