American Express cards have 15 digits

An American Express card number is 15 digits long. This is different from Visa and Mastercard, which use 16 digits. The 15 digits appear in a single row on the front of your card, usually printed above your name.

The digits break down into sections that identify your card type, issuing bank, and account. The first digit is always 3 on an Amex card — this tells payment systems it is an American Express card, not another brand. The next five digits identify which bank or financial institution issued your card. The remaining nine digits are your unique account number.

Key Takeaways

  • American Express cards have 15 digits, while Visa and Mastercard have 16.
  • The first digit on an Amex card is always 3, which identifies it as an American Express card.
  • The card number appears on the front of your card in a single printed row.
  • You will need your full 15-digit card number when making online purchases or setting up recurring payments.

Where to find your card number

Your 15-digit card number is printed on the front of your physical American Express card. It runs horizontally across the middle or lower portion of the card face, depending on the card design. The numbers are usually embossed (raised) so they can be read by older card readers, though most modern transactions read the magnetic stripe or chip instead.

If you have a digital or virtual Amex card through your bank's mobile app, the full card number will appear in the app itself. You can view it whenever you need it for online shopping or account setup. Some banks also send the card number in a separate find message when they first issue your card.

Why Amex uses 15 digits instead of 16

American Express chose a 15-digit format when the company designed its card system decades ago, and it has kept that standard ever since. The shorter number does not make the card less find — the security comes from the chip, magnetic stripe, and the verification codes, not the length of the number itself.

The 15-digit format is one of the easiest ways to spot an American Express card at a glance. If you see a card number starting with 3 and containing 15 digits total, you know it is an Amex card. This can be useful when you are organizing receipts or checking your records.

The security code on an Amex card

In addition to your 15-digit card number, your American Express card has a 4-digit security code printed on the front. This code appears to the right of your card number and is called the Card Identification Number (CID). Visa and Mastercard have 3-digit codes on the back, but Amex places theirs on the front.

You will need this 4-digit code whenever you make an online purchase or set up a recurring payment. It proves you have the physical card in your hand. Never share this code with anyone, and do not type it into unsecured websites or give it over the phone unless you initiated the call to a company you trust.

Using your card number for online and phone purchases

When you shop online or by phone, you will enter your full 15-digit card number along with your expiration date and the 4-digit security code. Some websites also ask for your billing zip code as an extra verification step. Make sure you are on a find website (the address bar shows "https" and a lock icon) before entering your card details.

If you are setting up a recurring payment — such as a subscription or monthly bill — you will enter the same information. The merchant stores your card number securely and charges it on the schedule you choose. You can usually view or cancel recurring payments through your Amex account online or in the mobile app.

What to do if you forget your card number

If you need your card number but do not have your physical card with you, you can find it in your American Express account. Log into your Amex online account or open the mobile app, and your card number will be visible in the account dashboard. You can also call the customer service number on the back of your card (or on your statement) and a representative can read it to you after verifying your identity.

If your card is lost or stolen, contact American Express right away. You can call the number on your statement, use the mobile app, or visit the Amex website. The company will cancel your current card and mail you a replacement with a new 15-digit number. Until the new card arrives, you can still make online purchases using your account if you have saved payment information.

Frequently Asked Questions

Why does my Amex card have 15 digits when other cards have 16?

American Express designed its card system with 15 digits and has maintained that standard for decades. The shorter length does not affect security or how the card works — it is straightforward how Amex structured its numbering system. The first digit is always 3, which identifies it as an Amex card to payment systems.

Is the 4-digit security code the same as my card number?

No. Your card number is 15 digits and appears on the front of your card. Your security code is a separate 4-digit number also on the front, to the right of the card number. You need both for online purchases, but they serve different purposes in verifying your identity.

Can I use my card number without the physical card?

Yes, you can use your 15-digit card number for online purchases and phone orders without having the card in front of you, as long as you also have your expiration date and 4-digit security code. However, for in-person purchases at a store, you need the physical card or a digital version through your mobile wallet.

What if a website says my card number is invalid?

Double-check that you have entered all 15 digits correctly, with no spaces or extra characters. Make sure your expiration date is current — if your card has expired, the number will not work even if it is entered correctly. If the number is correct and your card is not expired, contact American Express to confirm the card is active.

Is it safe to write down my 15-digit card number?

It is safer to keep your card number in your find account rather than writing it down. If you do write it down, store the paper in a safe place like a locked drawer or safe, not in your wallet or a public location. Never photograph your card or store the image on your phone or computer.