For informational purposes only. Not financial, investment, or tax advice. Results are estimates based on the inputs provided. Consult a qualified financial professional before making financial decisions.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
What Does This CD Calculator Measure?
A certificate of deposit locks money for a stated term and pays interest under the account terms. This calculator starts from the APY you enter, converts it to an equivalent monthly rate, and estimates the value at maturity when interest remains on deposit for the full term.
APY-Based Formula
Where:
- - initial deposit
- - annual percentage yield as a decimal
- - term in months
- - balance at maturity
Because APY already includes compounding, you should enter the quoted APY directly rather than an APR that still needs a compounding adjustment.
Worked Example
| Item | Value |
|---|---|
| Initial deposit | 10,000 USD |
| APY | 5.25% |
| Term | 12 months |
| Balance at maturity | about 10,525 USD |
| Interest earned | about 525 USD |
What This Result Does Not Include
- Early-withdrawal penalties or forfeited interest
- Taxes on the interest
- Brokered-CD resale gains or losses
- Automatic renewal into a different rate after maturity
FDIC-insured bank CDs are deposit products, not market securities, and the standard FDIC insurance limit is 250,000 USD per depositor, per insured bank, per ownership category. That limit applies across deposits in the same ownership category, not separately to every CD.
Reading the Result Well
Use the calculator for hold-to-maturity comparisons. If you may need the money before maturity, compare the quoted penalty language before choosing a term. If you are comparing several banks, compare APY, maturity date, withdrawal terms, and insurance coverage together.
Related Calculators
Use the Savings Calculator for flexible deposits, the Interest Calculator for general compounding, and the Simple Interest Calculator when no compounding is involved.
Frequently asked questions
Should I enter APY or APR?
Enter APY because this calculator is built around the annual yield after compounding. If a bank quotes both APR and APY, APY is the cleaner comparison number for deposit growth.
What happens if I withdraw before maturity?
The actual result can be lower because many bank CDs charge an early-withdrawal penalty or require you to forfeit some interest. The exact rule depends on the account disclosure, so check that wording before relying on the maturity value.
Are CDs insured?
CDs held at FDIC-insured banks are covered by FDIC deposit insurance up to the applicable ownership-category limit. The standard limit is 250,000 USD per depositor, per insured bank, per ownership category. Credit-union share certificates use separate NCUA coverage rules.
When is a CD ladder useful?
A ladder can help when you want some money maturing regularly instead of locking every dollar for one long term. It does not guarantee a better return; it mainly spreads access dates and reinvestment-rate risk.
