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APY calculator (APR to APY)

Convert a nominal APR to its effective APY — and back — for any compounding frequency.

Runs 100% in your browser
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How to convert APR to APY

  1. Enter a rate. Type an APR to get the APY, or an APY to get the APR.
  2. Pick the compounding. Choose how often interest compounds (daily, monthly, etc.).
  3. Read the equivalent. The effective APY (or nominal APR) updates instantly.

Compare savings on APY

Banks sometimes quote APR and sometimes APY; converting to APY puts every offer on the same footing. Once you have the APY, project growth with the high-yield savings or CD calculator.

Educational tool only — not financial advice.

Frequently asked questions

What is the difference between APR and APY?
APR is the simple nominal annual rate. APY (annual percentage yield) is the effective rate after compounding is applied, so APY is always equal to or higher than APR. APY is the figure to compare savings products by.
How is APY calculated?
APY = (1 + APR ÷ n)^n − 1, where n is how many times interest compounds per year. More frequent compounding raises the APY for the same APR.
Why does compounding frequency matter?
Daily compounding produces a slightly higher APY than monthly or annual for the same APR, because interest starts earning interest sooner.
Can I go from APY back to APR?
Yes — enter the APY and the tool shows the equivalent nominal APR for that compounding frequency.
Is anything uploaded?
No — it computes in your browser.

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