APR on savings accounts is calculated by taking your annual interest rate and dividing it by the number of days in a year, then multiplying that daily rate by your account balance each day

Most savings accounts don't actually use APR — they use APY, which accounts for compounding. But some banks still quote APR, and understanding the difference matters because APY will always be slightly higher than APR on the same account. APR is the straightforward annual rate before compounding happens. APY is what you actually earn after the bank compounds your interest.

Here's the practical difference: if a bank quotes 4.00% APR on a savings account that compounds daily, your actual earnings will be closer to 4.08% APY. That gap grows larger the more often interest compounds. Daily compounding beats monthly compounding, which beats annual compounding — all at the same APR.

Key Takeaways

  • APR divides the annual rate by 365 days and applies that daily rate to your balance each day, while APY includes the effect of compounding those daily earnings.
  • Banks are required to show you the APY, not the APR, on savings accounts, so you will usually see APY in your account disclosures.
  • The difference between APR and APY grows larger when interest compounds more frequently — daily compounding creates a bigger gap than monthly compounding.
  • To compare two savings accounts fairly, always use the APY figure, because it reflects what you will actually earn.

The daily calculation: how APR becomes your actual interest

Banks take the APR and convert it to a daily rate by dividing by 365 (or sometimes 360, depending on the bank's method). If your account has a 4.00% APR, the daily rate is 0.01096% per day. The bank then multiplies that daily rate by your account balance at the end of each day.

If you have $10,000 in the account, you earn about $1.10 in interest that day. The next day, if your balance is still $10,000, you earn another $1.10. But if the bank compounds daily — which most do — that $1.10 gets added to your balance before the next day's calculation. Now you're earning interest on $10,001.10, not just $10,000. That's compounding, and it's why APY is higher than APR.

The bank repeats this calculation every single day. At the end of the month, it adds up all those daily interest amounts and deposits them into your account. Some banks compound and credit monthly; others compound daily but credit monthly. Either way, the APY figure already accounts for this compounding effect.

Why banks show APY instead of APR on savings accounts

The Federal Reserve requires banks to disclose the Annual Percentage Yield (APY) on savings products, not the APR. This rule exists because APY is what you actually earn, and it makes accounts easier to compare. If two banks both showed APR, you wouldn't know which one would put more money in your pocket without doing the compounding math yourself.

When you look at your savings account statement or the bank's website, the rate you see is almost always APY. The bank may mention APR somewhere in the fine print, but the prominent number — the one used for comparisons and disclosures — is APY. This is true whether you're looking at a regular savings account, a money market account, or a certificate of deposit (CD).

The math behind the APR-to-APY conversion

If you ever need to convert APR to APY yourself, the formula is: APY = (1 + APR/365)^365 − 1. For a 4.00% APR, this gives you approximately 4.08% APY. The difference seems small, but on a $100,000 balance, that 0.08% gap means $80 per year in additional earnings.

The more frequently interest compounds, the larger the gap. If a bank compounded quarterly instead of daily, the APY would be lower — around 4.06% instead of 4.08%. If it compounded annually, APY and APR would be nearly identical. This is why high-yield savings accounts advertise daily compounding: it maximizes your earnings at any given APR.

You don't need to do this calculation yourself. Your bank's disclosure will show you the APY, and that's the number to use when comparing accounts. But understanding the formula helps you see why daily compounding matters and why a 4.00% APR account isn't the same as a 4.00% APY account.

How APR differs from APY in practice

APR is useful for loans — credit cards, mortgages, personal loans — because those products don't compound in your favor. You pay interest on the principal, and the interest doesn't earn interest. But savings accounts work the opposite way: interest compounds in your favor, so APY is the meaningful number.

Some older savings accounts or specialty accounts may still quote APR, but this is rare. If you see an APR figure on a savings product, ask the bank for the APY. The APY is what determines how much money you'll actually have at the end of the year, and it's the only fair way to compare two accounts side by side.

What happens to APR when rates change

Banks can change the APR on savings accounts at any time, and most do when the Federal Reserve changes its benchmark rates. When rates rise, your APR and APY both increase. When rates fall, they both decrease. The relationship between APR and APY stays the same — APY is always higher by the compounding effect — but the actual dollar amounts you earn change.

If you have a CD with a fixed rate, the APR and APY are locked in for the term. But regular savings accounts and money market accounts have variable rates, meaning the bank can adjust them without notice. This is why it's worth checking your account's current rate periodically and comparing it to other banks' offerings.

Frequently Asked Questions

Is APR or APY better for a savings account?

APY is better because it shows what you actually earn. APR is the starting point, but compounding adds to it. Always compare savings accounts using APY, not APR. The APY figure already includes the benefit of daily compounding.

Can a bank change my APR without telling me?

Yes, banks can change APR on variable-rate savings accounts without advance notice, though many send a notification. CDs have fixed rates locked in for the term. If you want a may provide rate, a CD is your option; if you want flexibility, accept that the rate may change.

Why is my savings account APY so low right now?

APY on savings accounts follows the Federal Reserve's benchmark rates. When the Fed lowers rates, banks lower APY on savings accounts. When the Fed raises rates, APY rises. Your bank's specific APY also depends on how much competition exists in your area and whether you're using an online bank or a brick-and-mortar branch.

Does APR explore to checking accounts?

Most checking accounts earn no interest, so APR and APY don't explore. Some banks offer interest-bearing checking accounts, which work the same way as savings accounts — they show APY, not APR. The rate is usually much lower than savings accounts because checking accounts are meant for spending, not saving.

How often does the bank compound my interest?

Most banks compound daily and credit monthly, meaning they calculate interest every day but deposit it into your account once a month. Some compound and credit daily. Check your account disclosure or ask your bank. Daily compounding gives you a slightly higher APY than monthly compounding at the same APR.