Nominal Rate
12.00%
Effective Rate Calculator
Convert a nominal annual rate into its effective annual rate (APY).
Effective Annual Rate (APY)
12.68%
Compounding Periods/Year
12
How to use the Effective Rate Calculator
The Effective Rate Calculator is free and runs entirely in your browser — no sign-up, and nothing you enter leaves your device. It opens pre-filled with a realistic example, so you can see how it works before replacing any figure with your own; the results update as you type. Press Calculate to refresh the result panel, or Reset to return to the example.
The inputs it asks for:
- Nominal Annual Rate — a percentage (enter 6 for 6%).
- Compounding Frequency — choose from 5 options (Annually, Semi-Annually, Quarterly, …).
The formula
Compounding makes a stated (nominal) rate worth more than its face value. The effective annual rate captures the true yearly return:
EAR = (1 + i/n)ⁿ − 1- i
- the nominal annual rate
- n
- the number of compounding periods per year
The more often interest compounds, the higher the effective rate for the same nominal figure. On deposits this same number is called APY.
Worked example
Using the example values — Nominal Annual Rate 12%, Compounding Frequency Monthly — the Effective Rate Calculator returns a Effective Annual Rate (APY) of 12.68%. It also reports Nominal Rate (12.00%), Compounding Periods/Year (12).
Prefer your own numbers? Change any field above and this recomputes instantly.
Key terms
- Nominal rate
- The stated annual rate, before compounding is taken into account.
- Effective annual rate (EAR)
- The true annual return once intra-year compounding is included.
- APY
- Annual percentage yield — the deposit-world name for the effective annual rate.
- Compounding
- Adding earned interest back to the balance so it, too, earns interest.
Frequently asked questions
What's the difference between nominal and effective?
Nominal ignores compounding; effective includes it. 12% compounded monthly is an effective 12.68% — the extra comes from interest earning interest during the year.
Is APY the same as APR?
Not quite. APY (like EAR) includes compounding and describes what you earn on savings. APR describes borrowing cost and, by convention, usually excludes intra-year compounding — see the APR calculator.
Why does compounding frequency matter?
Each compounding adds interest sooner, which then earns its own interest. Daily beats monthly beats annual — though the gap narrows as frequency rises.