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How many digits does a MasterCard have? A: A MasterCard has a total of 16 digits. MasterCard, as well as most major credit card systems, use the ANSI Standard X4.13-1983 system, in which each digit identifies a particular attribute of the card.
American Express is the most commonly held credit card that doesn't have a 16-digit number on the front. American Express card numbers have only 15 digits. Cards issued by Diners Club International also do not have 16 numbers. Diners Club cards are issued with 14 numbers on the front. However, some Diners Club cards issued in the U.S. that bear the MasterCard symbol now have 16 digits.