Premium APY Calculator
APR to APY Calculator
Convert APR to APY, reverse-calculate APY to APR, compare compounding frequency, and estimate how much interest a balance could earn over time.
APY calculator
Calculate effective annual yield
Use APR to APY mode for stated rates, or APY to APR mode when you know the effective yield.
Enter the nominal annual rate before compounding.
Optional, used to estimate dollars earned.
Used for projected balance growth.
Compounding frequency
More frequent compounding generally increases APY for the same nominal rate.
Quick presets
Start with common savings, CD, mortgage, or credit card examples.
Compounding frequency comparison
See how the same nominal APR changes as compounding becomes more frequent.
Balance growth projection
Projection assumes the calculated APY remains constant and interest is reinvested.
Year 1
$10,512
Interest: $512
Year 3
$11,615
Interest: $1,615
Year 5
$12,834
Interest: $2,834
Year 10
$16,470
Interest: $6,470
What APY Means
APY shows the annual return after compounding. It is commonly used for savings accounts, CDs, money market accounts, and other deposit products because it gives a more complete annual comparison than a stated interest rate alone.
APR vs APY
APR is usually used for borrowing and may include fees. APY is usually used for earning interest and reflects the compounding effect. Compare like with like whenever possible.
Which Rate Should You Compare?
Use APY to compare savings or CD yields. Use APR to compare loan costs. Use this calculator when you need to translate the compounding effect behind the headline rate.
Practical guidance
APY Calculator Use Cases
Ranking competitors often answer more than the formula. This calculator helps compare returns, understand compounding, and avoid mismatched APR vs APY comparisons.
Compare high-yield savings accounts by effective annual return.
Estimate CD interest before selecting a term or compounding schedule.
Translate a mortgage APR into an effective annual rate for education.
Understand how credit card compounding can increase annualized cost.
Compare daily, monthly, quarterly, annual, and continuous compounding.
Avoid comparing deposit APY directly against loan APR without context.
Common APY Mistakes
Comparing APR to APY directly
APR and APY can describe different sides of a financial product. Convert or compare within the same framework.
Ignoring fees and account rules
APY does not always show fees, minimum balances, or promotional conditions that may affect real earnings.
Assuming all accounts compound the same way
Daily, monthly, quarterly, annual, and continuous compounding can produce different APYs.
APY Calculator FAQ
What is APY?
APY, or annual percentage yield, is the effective annual rate after compounding is included. It helps compare savings accounts, CDs, and other interest-bearing products on the same yearly basis.
Why is APY higher than APR?
APY is usually higher than the stated rate because interest can compound during the year. More frequent compounding creates a larger difference between the stated annual rate and the effective annual yield.
Can I use this as an APY to APR calculator?
Yes. Switch to APY to APR mode to estimate the nominal annual rate that would produce a known APY at a selected compounding frequency.
Which compounding frequency should I choose?
Use the frequency shown by the account or loan disclosure. Savings accounts often compound daily or monthly, while some CDs and investment products may use different schedules.
Is APY the same as effective annual rate?
For most practical comparisons, APY and effective annual rate describe the same idea: the annualized rate after compounding is reflected.
Should I compare mortgage APR to savings APY?
Not directly. APR is usually used for borrowing costs, while APY is usually used for deposit returns. This calculator helps translate between compounding assumptions, but product fees and terms still matter.
Ready to Compare Mortgage Options?
Understanding APR and APY is a useful step. Our mortgage team can help you compare loan options, monthly payments, and the total cost of financing.
Calculator results are estimates only and do not represent a loan approval, deposit offer, or final terms.