Walk into any bank branch or open any financial comparison site and you'll encounter both APR and APY. They're often listed side by side, occasionally confused, and sometimes deliberately presented in a way that makes a product look better than it is. Once you understand what each term actually measures, you can cut through the marketing noise and compare financial products accurately.
APR: Annual Percentage Rate
APR is the annualized interest rate expressed as a simple percentage, without accounting for compounding within the year. It's primarily used for borrowing products: mortgages, auto loans, personal loans, and credit cards. Federal law (the Truth in Lending Act) requires lenders to disclose APR so consumers can compare loan products on a standardized basis ? and it must include certain fees such as origination charges and mortgage points.
APY: Annual Percentage Yield
APY is the effective annual return after accounting for compounding. It's used for deposit products: savings accounts, money market accounts, and CDs. Federal law (the Truth in Savings Act) requires banks to advertise deposit rates as APY so consumers can compare products accurately across different compounding frequencies. APY is always equal to or greater than the nominal rate.
APY = (1 + APR/n)n − 1
Converting APY → APR:
APR = n × ((1 + APY)1/n − 1)
Where n = compounding periods per year
Example: A 4.80% APR compounded daily (n=365) gives an APY of approximately 4.918%. On $50,000 over 5 years, that 0.118% difference is roughly $300 in additional interest. Our APY/APR Calculator handles this conversion instantly.
Side-by-Side: The Key Differences
| Feature | APR | APY |
|---|---|---|
| Accounts for compounding? | No | Yes |
| Used for | Loans, credit cards, mortgages | Savings accounts, CDs, money market |
| Required by | Truth in Lending Act | Truth in Savings Act |
| Includes fees? | Yes (for loans) | No |
| Golden rule | Lower APR = better deal | Higher APY = better deal |
Why the Same Rate Looks Different as APR vs. APY
Take a savings account with a 4.75% nominal rate compounded daily. The bank can advertise this as 4.75% APR (looks lower) or 4.864% APY (looks higher). Savvy banks advertising to savers use APY because it's the larger number ? which is also why law requires it for deposits, so consumers can compare apples to apples.
On the borrowing side, a credit card with 24% APR compounded daily has an effective annual cost of approximately 26.97% APY. Lenders use APR for credit cards (the lower number). Knowing the true cost is slightly higher is worth bearing in mind when carrying a balance.
Compounding Frequency: How Much Does It Actually Matter?
| Compounding Frequency | APY on 4.75% Nominal Rate |
|---|---|
| Annually (n=1) | 4.750% |
| Quarterly (n=4) | 4.840% |
| Monthly (n=12) | 4.855% |
| Daily (n=365) | 4.864% |
The practical conclusion: the nominal rate matters far more than the compounding frequency. Don't pass up a 4.90% APY account that compounds monthly in favor of a 4.60% APY account that compounds daily.
Real-World Applications
Savings accounts
Always compare APY. Use our Savings Calculator to project how much each rate earns on your specific balance over time.
CDs
Advertised in APY, making comparison straightforward. Use our CD Rate Calculator to compare term lengths.
Mortgages
APR includes fees, so two mortgages with the same interest rate but different origination costs will have different APRs. The lower APR costs less over the full term. See the Mortgage Calculator for total interest paid.
Credit cards
The APR is the rate applied when you carry a balance. Our Credit Card Payoff Calculator shows the total interest cost and payoff timeline for your current balance.
Convert Between APR and APY
Enter any rate and compounding frequency in the APY/APR Calculator to compare products accurately.
For more on how compounding works, see What Is Compound Interest and Why It's the Most Important Concept in Personal Finance.