Certificate of Deposit Calculator
Calculate the maturity value, total interest, and effective APY for a US Certificate of Deposit (CD). A CD is a time deposit account with a fixed term and guaranteed interest rate. Early withdrawals usually incur a penalty.
CD Results
Calculate Your CD Returns
Enter your deposit, term, and APY to see the maturity amount and interest earned. Estimate early withdrawal penalties if needed.
About This CD Calculator
What is a CD?
A Certificate of Deposit (CD) is a fixed-term savings product offered by US banks and credit unions. You deposit money for a set period and earn a guaranteed rate. Withdrawing early typically incurs a penalty.
APY vs Interest Rate
APY reflects the effect of compounding. This calculator uses your APY and compounding frequency to compute maturity value and the effective annual return.
Early Withdrawal Penalty
How to use it:
1) In the form, set Early Withdrawal Penalty to your bank’s rule (e.g., 3 months).
2) In the estimator, enter Withdraw After (Months) = when you might break the CD.
We estimate the payout as accrued value − (penalty months × roughly one month of interest on principal-to-date).
Example: 36‑month CD, penalty = 3 months, withdraw after 12 months → we apply ~3 months of interest as a penalty to the amount you have by month 12.
Add-On CDs
Turn on Add-On CD if your bank lets you add money as you go.
• Monthly Add-On ($): the amount you’ll add each month.
• Add-On Start: when to begin those monthly adds.
Note: The start follows your selected term unit, if the term is in Months, “Start = 6” means month 6; if the term is in Years, “Start = 1” means year 1.
⚠️ Important Disclaimer
Calculations are estimates for educational purposes and may not match your bank's exact rules. Always review your CD agreement for compounding, penalty, grace period, and renewal terms.