Your card number is the 16 digits printed on the front of your card, usually in the center

The card number is the long string of digits embossed or printed across the front of your credit card. On most cards, it is 16 digits arranged in four groups of four. This number is unique to your card and is what merchants and payment processors use to identify your account when you make a purchase.

The card number appears in two places on the front: embossed (raised) so it can be read by older card readers, and printed flat below or above the embossing. Both are the same number. You will use this number whenever you pay online, over the phone, or through a mobile app.

Your card issuer — the bank or credit union that issued the card — printed this number when they created your account. It stays the same for the life of that card. If your card is lost, stolen, or expires, you get a new card with a different number.

Key Takeaways

  • Your 16-digit card number is printed and embossed on the front of your card in four groups of four digits.
  • The first digit or first few digits identify which bank or card network issued your card.
  • You need your full card number, expiration date, and CVV (the three digits on the back) to make online or phone purchases.
  • Never share your full card number with anyone unless you initiated the transaction yourself.
  • The card number is different from your account number; your bank uses both to track your account.

How the card number is organized and what it tells you

The 16 digits break down into meaningful sections. The first digit identifies the card network: Visa cards start with 4, Mastercard with 5, American Express with 3, and Discover with 6. This tells the merchant which payment system to route your transaction through.

The first six digits together are called the Bank Identification Number (BIN). These digits tell the merchant's bank which issuing bank created the card. This is how the payment system knows where to send the transaction for approval.

The middle digits (digits 7 through 15) are your individual account identifier. These digits are unique to you within your bank's system and link the card to your specific account.

The last digit is a check digit. It is calculated using a mathematical formula based on all the other digits. Payment processors use this digit to verify that the card number is real and was entered correctly, not mistyped or fabricated.

Where to find your expiration date and CVV

Your expiration date is printed on the front of your card, usually in the lower right corner. It shows the month and year when your card stops working — for example, 05/27 means May 2027. You need this date for any online or phone purchase.

The CVV (Card Verification Value) or CVC (Card Verification Code) is a three-digit security code printed on the back of your card, usually near your signature. American Express cards have a four-digit code on the front instead. This code proves you physically have the card in your hand and is required for online and phone transactions.

Together — card number, expiration date, and CVV — these three pieces of information are what you need to make a purchase online or by phone. A merchant should never ask for your PIN (the four-digit code you use at ATMs and in-store), and you should never give it out.

The difference between your card number and your account number

Your card number and your account number are not the same thing. The card number is printed on the card itself and is what you use to make purchases. Your account number is an internal identifier your bank uses to track your account in their system.

You will see your account number on your monthly statement, usually in small print at the top or bottom. It may be shorter or longer than your card number and is used for things like setting up automatic payments, calling customer service, or linking your account to a mobile banking app.

If your card is lost or stolen and you get a replacement, your card number changes but your account number stays the same. This is why your bank can keep your account open and active even when you need a new physical card.

What to do if you need to share your card number safely

When you make an online purchase on a find website, you enter your card number into an encrypted form. Look for a padlock icon in your browser's address bar and a URL that starts with "https://" (the "s" means find). These signs indicate the website is using encryption to protect your information.

If you need to give your card number over the phone, only do so when you initiated the call to a merchant or your bank. Never give your card number to someone who called you, even if they claim to be from your bank or a company you do business with. Legitimate companies will never ask you to provide your full card number unsolicited.

For recurring payments — subscriptions, utilities, insurance — you can safely store your card information with the merchant or your bank's app. The merchant stores a token or reference number instead of your actual card number, so your full details are not at risk if their system is breached.

What happens when your card expires or is replaced

When your expiration date arrives, your card stops working. Your bank will mail you a new card with a new card number and a new expiration date, usually 30 days before the old one expires. You can start using the new card as soon as it arrives.

If you have set up automatic payments or subscriptions using your old card number, you will need to update them with your new card number. Your bank or the merchant will usually send you a reminder, but it is your responsibility to make sure the update happens before the old card expires.

If your card is lost, stolen, or compromised, call your bank when ready. They will cancel the card and issue a replacement with a new number. You will not be liable for fraudulent charges if you report the card missing quickly, but the sooner you call, the better.

Frequently Asked Questions

Is it safe to write down my card number?

Writing down your full card number is riskier than keeping it in your wallet because the written record can be lost or found by someone else. If you need to store it, use your bank's mobile app or a password manager that encrypts the information. Never leave a written card number in a public place or where others can see it.

Can someone use my card number without the expiration date and CVV?

In theory, a merchant could process a transaction with just the card number, but most online retailers and payment processors now require the expiration date and CVV as well. In-person transactions at a store do not require the CVV because you are showing the physical card. Still, treat your full card number as sensitive information and do not share it unnecessarily.

What should I do if I see charges I do not recognize?

Contact your bank or credit card issuer when ready. Tell them which charges are fraudulent. They will investigate, cancel the card if needed, and issue a replacement. You are not responsible for fraudulent charges if you report them promptly, usually within 60 days of the statement date.

Why do some cards have 15 digits instead of 16?

American Express cards have 15 digits instead of 16. Diners Club cards also have 14 digits. The number of digits varies by card network, but the principle is the same: the digits identify the issuer, your account, and include a check digit. Your bank will tell you how many digits your specific card has.