Credit cards are a form of revolving credit: you're approved for a limit, and you can borrow against it repeatedly as you pay it down. Used well, they're a useful tool for building credit history and earning rewards. Used carelessly, the interest can outweigh almost any reward.
This section covers how card interest is actually calculated, how to read a statement, and what matters most when choosing a first or next card.
Credit Cards guides
Read up before you decide
In-depth explainers from our editors, newest first.
One standout pick from each type of card, to start your search.
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Top pick · Rewards Cards
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Rewards Cards
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Wells Fargo
Wells Fargo Active Cash® Card
Best for: Everyday spending, paid in full monthly
Flat-rate cash rewards on every purchase
No annual fee
Intro APR period on purchases and qualifying balance transfers
Full details, pros & cons
A flat-rate cash rewards card with no annual fee, built for everyday spending without tracking bonus categories.
Pros
Simple, flat rewards rate with no categories to track
No annual fee
Cons
Rewards rate is flat rather than boosted in specific categories
Rates, fees and terms are set by the provider and can change at any time — confirm current details on their site before applying.
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Secured Cards
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Discover
Discover it® Secured Credit Card
Best for: Building or rebuilding credit
Earns cash back while building credit
No annual fee
Automatic account reviews for graduating to an unsecured card
Full details, pros & cons
A secured card that earns cash back while building credit. Discover has periodically paused new applications during its integration with Capital One, so check the issuer's site for current availability before applying.
Pros
One of the few secured cards with a real rewards program
Cons
Application availability has varied — confirm on the issuer's site
Rates, fees and terms are set by the provider and can change at any time — confirm current details on their site before applying.
Quick answers
Credit Cards questions, answered
The questions readers ask us most about credit cards.
How is credit card interest actually calculated?
Most issuers apply a daily rate — your APR divided by 365 — to your average daily balance across the billing cycle. Paying your statement balance in full by the due date generally avoids interest entirely, thanks to the card's grace period.
What's the difference between my credit limit and available credit?
Your credit limit is the maximum the issuer allows on the account. Available credit is what's left after your current balance and any pending charges — the two are only equal when your balance is zero.
Do rewards make a card worth it even if I carry a balance?
Usually not. Rewards rates are typically a small percentage of spending, while carrying a balance accrues interest daily — often far outweighing whatever cash back or points were earned. Rewards tend to pay off only when the balance is paid in full each month.