CD Interest from Effective APY
Treat APY as an annual yield that already incorporates compounding. This implementation has no daily-compounding loop, so distinguish the input from a nominal rate and from a bank’s actual day-count calculation.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Enter USD principal, APY as a percentage and the term in months. Confirm that the advertised figure is APY; substituting a nominal annual interest rate can change the meaning of the comparison.
Results and examples
The ending balance is principal × (1 + APY/100)^(months/12), with the difference shown as pre-tax interest. It is an estimate without actual deposit dates or withdrawal conditions.
Worked example
USD 10,000 at 4.4% APY for 12 months gives USD 10,440 at maturity and USD 440 interest.
Limitations
- Taxes, early-withdrawal penalties and conditional bonuses are excluded.
- Months divided by 12 does not reproduce every actual-day disclosure calculation.
Fields
| Field | Guidance and constraints |
|---|---|
| Deposit | Accepted range: 0–100000000 · Input step: 100 |
| APY | Accepted range: 0–30 · Input step: 0.01 |
| Term (months) | Accepted range: 1–120 · Input step: 1 |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Does it compound daily?
No. It applies the effective APY directly over a fractional-year exponent.
Are interest rate and APY identical?
Not necessarily; compounding frequency can make them different.
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