Savings APY from a Nominal Rate
Compare deposit scenarios with different nominal rates and compounding frequencies. Unlike the CD form that accepts APY, this calculator takes a nominal rate and produces APY as an output.
- 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, nominal annual rate, years and compounds per year. Entering an already advertised APY as nominal applies compounding again, so check the rate label first.
Results and examples
APY is (1 + nominal/n)^n minus one, while ending balance also uses the selected term. Effective annual yield and return over the entire term need not be the same percentage.
Worked example
USD 1,000 at nominal 12%, monthly compounding for one year gives about 12.6825% APY and USD 1,126.83.
Limitations
- Account fees, conditional promotions and changing rates are excluded.
- Actual dates and detailed regulatory day counts are not reproduced.
Fields
| Field | Guidance and constraints |
|---|---|
| Starting balance | Accepted range: 0–100000000 · Input step: 50 |
| Nominal annual rate | Accepted range: 0–30 · Input step: 0.01 |
| Years | Accepted range: 0.25–40 · Input step: 0.25 |
| Compounds per year | Annually / Quarterly / Monthly / Daily |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Should I paste my CD’s APY here?
No. This input requires a nominal annual rate.
Does a longer term increase APY?
Not with the same rate and frequency; it changes the balance instead.
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