![]() ![]() A company can not “make up” its own UPC number. Using some form of check digit generator (use our free check digit calculator) this digit is calculated using a mathematical calculation based on the first 11 digits of the UPC code.Ī common mistake companies make is creating their own UPC numbers. The twelfth character is called the “check digit”. Unlike the GS1 Company Prefix, product numbers are arbitrarily assigned by each company. The next set of digits is called the “product numbers.” Product numbers uniquely identify individual items. This number uniquely identifies a company and always remains constant on all of a company’s products. The first six to nine digits of a UPC are referred to as the “Company Prefix”, and they are assigned by a non-profit organization (GS1 US formerly the Uniform Code Council).
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