What Is Credit Card APR?

What does 24% APR mean in dollars?

It does not mean the issuer charges you 24% of your balance every month. For a simple illustration, a 24% annual rate divided by 365 produces a daily rate of about 0.06575%.

Suppose a $2,000 balance accrues interest for 30 days without changing. Under a simple daily-interest estimate:

$2,000 × 0.24 ÷ 365 × 30 = $39.45.

At 18% APR, the same estimate is $29.59. The lower rate saves about $9.86 over that particular period.

This is a teaching example, not a prediction of a statement. It excludes fees, daily compounding, new transactions, and payments during the period. Many issuers use daily balances, so a changing balance produces a different result. CFPB interest calculation guide

The practical point is that the APR and the amount exposed to that rate work together. A lower APR helps, but paying down the balance earlier can also reduce interest.

Which APR should you check?

These are different uses of the account. A purchase promotion does not establish that cash advances or transferred debt receive the same rate. Check the rate-and-fee disclosure for each transaction type. Credit-card disclosure requirements

If you already have the card, use your statement and agreement. An advertisement showing a range of possible rates is not necessarily the rate assigned to your account.

You may be able to avoid purchase interest

If your card provides a purchase grace period and you meet its conditions, paying the full statement balance by the due date can avoid interest on those purchases. A grace period is not required on every credit card, and it generally does not work the same way for cash advances. Carrying a balance can affect whether new purchases receive a grace period. CFPB grace-period guide

That makes the question “Will I carry a balance?” central to comparing cards. If you reliably qualify for interest-free purchases, an annual fee or another transaction fee may matter more than a difference in purchase APR. If you expect to borrow for several months, calculate interest before focusing on rewards.

Paying the minimum required amount is a different task from paying the statement balance in full. The minimum satisfies a required payment when paid correctly and on time; it is not a promise that your purchases remain interest-free.

A variable APR can change

A variable rate may be tied to an index plus a margin. When that index changes, your rate can change under the agreement. Index-driven changes are not treated identically to every other change in card terms, so do not assume all rate changes require the same advance notice. Office of the Comptroller of the Currency

For planning, test the rate on your statement first. If the repayment period is long, run a second scenario at a higher rate to see whether your intended payment still works. That is a stress test, not a forecast.

Compare the total decision, not just the rate

Before selecting a card for borrowing, write down the planned balance, the relevant APR, fees, and a monthly payment you can sustain. For an introductory offer, also record the end date and the rate that follows.

For example, a lower transfer APR may come with an upfront transfer fee. A higher-rate card may cost less for a very short borrowing period if switching would impose a larger fee. You need the dollar comparison to decide.

Use the credit card interest calculator to compare payment scenarios. For the billing-cycle mechanics behind the result, see the companion guide to how credit card interest works when available.

Is APR applied or charged monthly?

APR expresses an annual rate. A credit card statement usually bills interest for a billing cycle, but many issuers calculate the charge using daily balances and a daily periodic rate. CFPB guidance explains that the daily rate generally uses APR divided by 360 or 365, depending on the issuer. The account agreement controls the method.

As a simplified illustration using a 365-day year, a constant $1,000 balance at 28% APR over 30 days would produce about $23.01 of interest: $1,000 × 0.28 ÷ 365 × 30. This assumes the whole balance accrues interest throughout the period. A grace period, payment, new charge, different cycle length or compounding can change the actual bill.

How to find your APR on a Discover or other credit card

Check the interest-charge calculation section of your latest statement and the pricing terms for your exact account. Purchases, balance transfers and cash advances may have separate APRs. An introductory rate can also have an expiration date and conditions. There is no single Discover APR that applies to every cardholder or balance.

To answer “what is my APR?”, match the balance type to its rate rather than using an advertisement for a new customer. If the statement is unclear, ask the issuer which rate applies and how the interest was calculated. Use the credit card interest calculator to test a repayment plan, then compare the estimate with the statement.