CD Calculator

Using the cd estimate

A certificate of deposit projection estimates the balance when a lump sum remains invested through a stated term. This calculator uses APY, which already includes compounding, and scales that effective annual growth to the selected number of months. It helps compare deposits with different yields or terms. Maturity value is not automatically the amount you can withdraw early or the after-tax cash you will keep.

Step-by-step inputs

1. Initial deposit. Use the amount committed at the start. Additional deposits are not included in this single-deposit model. Starting example: $10,000 .
2. APY. Enter the advertised annual percentage yield, not a nominal rate unless the two are equal. Do not add a separate compounding premium to APY. Starting example: 4.25% .
3. Term. Choose the term you intend to hold. Shorter-than-one-year terms use a fraction of annual growth, not the full year's advertised interest. Starting example: 12 months .

Worked example with the starting values

Using the starting inputs, the estimate is Balance at maturity: $10,425.00 .

The maturity balance equals the initial deposit multiplied by the APY growth factor raised to months divided by 12. Interest earned is the maturity balance less principal. The chart separates deposited money from that interest rather than treating the whole balance as a return.

Interest earned

$425.00

Initial deposit

$10,000

Compare apy scenarios

All other inputs stay at their starting values. These are modeled comparisons, not quotes, predictions or individual recommendations.

Make a useful comparison

Compare products over matching horizons when possible. A higher APY over a much longer term is not automatically more suitable for money needed soon. Access timing and the rate are both part of the decision.

Read the maturity and early-withdrawal terms. A penalty can reduce proceeds if you need cash before the term ends. Automatic renewal can also create a new commitment unless you act during the institution's specified window.

For a ladder, model each deposit separately. Different maturities and yields have different growth periods; one average rate and term cannot exactly describe all rungs. Keep cash required for near-term bills outside locked-up deposits.

Common mistakes to avoid

• APY is annualized. A six-month CD does not earn an entire year of APY simply because the percentage is advertised annually.
• The result assumes growth remains with the deposit. Interest paid out rather than reinvested can change the maturity balance under the account terms.
• Taxes, early-withdrawal penalties and reinvestment after maturity are not included. A maturity estimate does not establish deposit protection or verify an institution.