What is APR on a credit card?

APR is your interest rate expressed as a yearly figure so cards can be compared like for like. Your card almost certainly has several — purchases, cash advances and balance transfers are usually priced differently — and the one that matters is whichever applies to the balance you carry.

The APRs on a typical card, and when each one applies
APR type	Applies to	Grace period?
Purchase APR	Everyday spending	Yes — pay the statement balance in full and purchases cost no interest
Cash advance APR	ATM withdrawals, cash-like transactions	No — interest usually starts the day the cash is taken
Balance transfer APR	Balances moved from another card	No, and a transfer fee usually applies
Penalty APR	Applied after a serious delinquency	No — and it can apply to your existing balance
Promotional / intro APR	Whatever the offer specifies, for a set window	Ends on a date; what happens next is in the offer

APR is the comparison unit, not the charge

The CFPB describes APR as the yearly rate that lets you compare borrowing costs on an apples-to-apples basis. You are never billed "an APR" — the card divides it down to a daily periodic rate and applies that to your balance each day. The annual figure exists so that a 19.99% card and a 26.99% card can be held next to each other meaningfully.

Your card has more than one, and they are not close together

The purchase APR is the one advertised. The cash advance APR is typically several points higher and, critically, has no grace period — interest starts accruing the moment you take the cash. Balance transfers have their own rate and usually a fee. A penalty APR can be triggered by serious delinquency. All of them are printed in the interest charge calculation section of your statement, which is where to look rather than at the marketing.

Fixed and variable are not what they sound like

Most credit card APRs are variable: tied to an index, so the rate moves when the index does, without the issuer having to notify you of a change. A "fixed" card APR can still be changed with advance notice. The CFPB's guidance is to find out which you have when you are shopping — it is the difference between a rate that moves on its own and one that moves only when someone decides it should.

What APR means for a balance you are carrying

Divide it by twelve and you have roughly what the balance costs you per month; divide by 365 and you have the daily periodic rate the issuer actually uses. At 24.99%, six thousand dollars accrues a little over four dollars a day. That per-day figure is usually more motivating than the percentage, and it is what the daily interest calculator here exists to produce.

Where APR stops mattering

If you pay the statement balance in full every month, the purchase APR is close to irrelevant — the grace period means purchases cost nothing to carry. APR becomes the dominant number the moment a balance survives a due date. That is the honest framing: it is a rate on money you keep, not a fee on money you spend.

This page explains the mechanism. The arithmetic is one click away.

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Frequently asked questions

Is APR the same as the interest rate?

For credit cards, effectively yes — the CFPB notes that card interest rates are stated as a yearly rate called the APR. For loans with origination fees the two can differ, because APR folds certain fees into the comparison. On a card, treat them as the same number.

What is a good APR on a credit card?

The useful benchmark is the published average rather than anyone's opinion: the Federal Reserve's G.19 series reports the average rate on accounts actually assessed interest, and this site cites the current figure with its period on the calculator pages. Below that average is better than it; what you are offered depends on the issuer's assessment of you.

How is APR converted into what I actually pay?

Issuers divide the APR by 365 (some use 360) to get a daily periodic rate, then apply it to your average daily balance. Calculators, including this one, use the monthly equivalent because it produces the same month counts and a far more readable schedule — the difference over a cycle is cents, and we say so rather than hide it.

Why is my cash advance APR higher, and why was I charged immediately?

Cash advances are priced as a riskier product and, unlike purchases, carry no grace period — interest typically accrues from the transaction date, often alongside a separate cash advance fee. A cash advance is one of the few card transactions where the cost begins the same day.

Can my APR go up?

Yes. A variable APR moves with its index automatically. A rate increase for other reasons generally requires advance notice, and a penalty APR can follow a serious delinquency. Your statement lists the rate currently applied to each balance type, which is the reliable place to check rather than remembering what you signed up for.

Official sources

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