APR stands for annual percentage rate. It is the price of borrowing money, expressed as a yearly percentage. When a card lists an APR, that number tells you, in rough terms, how much it would cost to carry a balance for a full year. This page explains what APR is and the different kinds you will see on a single card. For the mechanics of how that yearly rate becomes an actual daily charge on your balance, see the keystone explainer, how credit card interest works.
APR vs. interest rate: on a card, they are the same
People often ask whether APR and "interest rate" are two different things. With other kinds of borrowing, they can be. On a mortgage, for example, the APR is usually higher than the note rate because it bundles in certain fees -- points, some closing costs -- to give you a fuller picture of the loan's cost. The APR and the interest rate are deliberately different numbers there.
Credit cards work differently. Card issuers do not roll separate financing fees into the rate, so on a credit card the APR and the interest rate are effectively the same figure. When your card says it has a purchase APR, that is the interest rate applied to purchases you carry. You can treat the two words as interchangeable in the card context without losing anything. (Annual fees, late fees, and foreign-transaction fees exist, but they are charged separately and are not built into the APR.)
Variable vs. fixed APR
Most credit card APRs are variable. A variable APR is tied to a published index -- almost always the prime rate -- plus a fixed margin the issuer sets based on your credit profile. So your rate is essentially "prime plus a margin." When the Federal Reserve raises or lowers its benchmark, the prime rate moves with it, and your variable APR moves too, usually within a billing cycle or two. You did nothing to cause the change; the index simply shifted.
A "fixed" APR is less common on cards, and the label is a little misleading. A fixed card APR is not pinned forever -- the issuer can still change it, but generally must give you advance notice before doing so, and the change typically applies to future balances rather than retroactively. So "fixed" mostly means "does not float automatically with prime," not "can never change."
The different APRs on one card
A single card usually carries more than one APR, each applying to a different type of transaction. The most common ones are:
- Purchase APR -- the rate applied to everyday purchases you do not pay off by the due date. This is the number most people mean when they ask about "their APR."
- Balance-transfer APR -- the rate on debt you move from another card. Many cards advertise a 0% introductory rate for a set number of months, then the balance reverts to a regular (often higher) ongoing APR once the promo ends. The revert rate, not the teaser, is what you live with long term. See what happens when the 0% balance-transfer period ends.
- Cash-advance APR -- the rate when you pull cash from the card. It is usually higher than the purchase APR, and crucially there is no grace period: interest starts the day you take the cash. That is a big reason a cash advance is so expensive.
- Penalty APR -- a much higher rate the issuer can apply after you fall far behind, typically after a payment is significantly past due. It is the most punishing rate on the card. The good news is that it is not always permanent: making a stretch of on-time payments can get many issuers to remove the penalty rate over time and return you to your normal APR.
Where to find your APR
You do not have to guess. Every card discloses its rates in two reliable places:
- The Schumer box -- a standardized rate-and-fee table that appears in the card's terms and in your cardholder agreement. It lists each APR (purchase, balance transfer, cash advance, penalty), whether each is variable, and how the penalty rate is triggered. This is the single best place to compare cards apples to apples.
- Your monthly statement -- it shows the APR currently applied to each balance type and the interest charged for that cycle. If your rate recently changed, the statement is where you will see the new number in action.
If your statement is showing a rate that surprises you, comparing it against the Schumer box in your agreement will usually explain why.
What counts as a "good" APR?
There is no single "good" number, and anyone who quotes you one is oversimplifying. What is available to you depends on two things: your credit and the broader rate environment. People with stronger credit profiles are generally offered lower margins over prime, while thinner or rougher credit tends to draw higher rates. And because variable APRs float with prime, the same applicant might be quoted noticeably different rates in a high-rate year versus a low-rate one.
The 0% intro offers you see advertised are promotional and temporary -- a marketing window, not your real long-run rate. Judge a card on the ongoing APR you will pay after any promo ends, alongside its fees. The most useful comparison is not against a magic threshold but against your other options: a lower-rate card, a consolidation loan, or simply paying the balance in full so the APR never bites at all.
How APR connects to what you actually pay
Knowing your APR only matters because of what it does to a balance you carry. The yearly rate gets converted to a daily rate and applied to your balance each day, which is why carrying debt month to month quietly compounds. The full daily-accrual mechanics live in the keystone, how does credit card interest work -- start there if you want to see exactly how the number turns into a charge.
The practical takeaway: the higher your APR and the longer you carry a balance, the more of every payment goes to interest instead of principal. That is exactly why paying only the minimum is so slow and so costly -- run your own numbers with the minimum payment calculator to see how long a balance would take and how much interest your APR would add. When you are ready to build an actual payoff plan, the debt payoff calculator shows how extra payments shrink that interest and shorten the timeline, and paying only the minimum explains the trap in plain terms.
This page is general information, not financial or legal advice. APRs, terms, and offers vary by issuer and change over time; always confirm the current rates in your own cardholder agreement and statement before making a decision.