CD Calculator (Certificate of Deposit)
CD calculator: what a certificate of deposit is worth at maturity from the deposit, APY and term, plus the interest earned. Or find the APY you need.
A = P · (1 + APY)t
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
APY already includes compounding, so balance = deposit × (1 + APY)^years. Use months for short CDs.
Early withdrawal usually costs several months of interest.
Estimates for planning only; not financial advice. Your lender’s or provider’s figures may differ.
Formula
A = P · (1 + APY)t
| Symbol | Quantity | Units |
|---|---|---|
| P | Deposit | $, €, £ |
| APY | APY (annual yield) | %, × |
| t | Term | years, months |
| A | Balance at maturity | $, €, £ |
Worked example
Given: P = 10,000.00 $ · APY = 4.5 % · t = 12 months
A = P (1 + APY)t
Result: A = 10,450.00 $
Balance at maturity for different values of Deposit
| P · Deposit | A · Balance at maturity |
|---|---|
| 5,000.00 $ | 5,225.00 $ |
| 7,500.00 $ | 7,837.50 $ |
| 9,000.00 $ | 9,405.00 $ |
| 10,000.00 $ | 10,450.00 $ |
| 11,000.00 $ | 11,495.00 $ |
| 12,500.00 $ | 13,062.50 $ |
| 15,000.00 $ | 15,675.00 $ |
| 20,000.00 $ | 20,900.00 $ |
Other values as in the worked example.
Frequently asked questions
$10,000 in a 12-month CD at 4.5 % APY?
$10,450 at maturity — $450 in interest.
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