APR to APY (And Back!) Calculator

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The difference between APR and APY is pretty important to understand (but not difficult to understand) but the math can be a pain. Enter: The APR to APY (and back!) Calculator!.

It’s fairly straight forward, enter in an APR or an APY, confirm the number of compounding periods, and click on the button you want to do. The only limitation in the calculator is that it won’t do continuous compounding. You can just put some large number and that’ll be good enough because its rounded to two decimal points anyway. Another point to confirm is whether “daily compounding” is 360 periods a year or 365 periods, banks may use either one (it won’t matter which one you use because of how the calculator is rounding, it’ll give you the same answer).

APR to APY Calculator (and back!)

Annual Percentage
Rate (APR)
Annual Percentage
Yield (APY)
APR: % APY: %
{ 14 comments, please add your thoughts now! }

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14 Responses to “APR to APY (And Back!) Calculator”

  1. Aya @ Thrive says:

    That’s a cool tool!

  2. mrchase1 says:

    It is amazing the way the banking industry makes money right under our noses. I have been researching quite a bit in order to retire securely when the time comes but I was never aware of it. I blame it on the public school system. 🙂 Great information, I appreciate the videocast

  3. $kye$tar says:

    Thanks for the information … the APR – APY calculator comes in very handy.

  4. Colleen says:

    Thanks! I just used this for my math homework

  5. Jose Tuarez says:

    the APR – APY calculator comes in very handy at all times.


  6. Dr. H says:

    I use a solar TI BA II financial calculator, $40. eBay.

  7. Joe The Plumber says:

    All is good but with APYs in the single percentages the rounding that this calculator does makes it less useful

  8. mhh says:

    What are the two formulas used for these calcs that could be put into an Excel Spreadsheet?

    • Jim says:

      To go from APY to APR it would be =((1+X)^(1/Y)-1)*Y
      X is your APY, Y is the number of periods

      To go from APR to APY it would be =(1+X/Y)^Y-1
      X is your APR, Y is the number of periods

  9. billy says:

    Woa, this really saved me, is there some downloadable version?

  10. jj says:

    3 decimal places please

  11. apy says:

    When I use the calculator and the formula in the comments I get two different things.

    • apy says:

      Found my mistake! X in the formula needs to be as a number not a percent. Then multiply by 100 to get back to the percent after.


  12. Great little tool thanks you for posting!

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