UPC-A

UPC-A
Name	UPC-A
Type	Barcode symbology
Introduced	1973
Owner	GS1 US
Digits	12
Country	United States

UPC-A UPC-A is a 12-digit barcode symbology widely used for retail product identification in United States, Canada, and international trade. It is maintained by GS1 US and interoperates with systems from IBM, Walmart, Kroger, and retailers implementing EAN-13 conversion. UPC-A played a central role in automation projects involving IBM System/360, Point of Sale terminals at Sears, and distribution practices influenced by National Association of Chain Drug Stores.

Overview

UPC-A encodes a 12-digit numeric identifier assigned by GS1 US and used by retailers such as Target, Costco, Walgreens, Albertsons, and Ahold Delhaize. The symbol consists of quiet zones, guard patterns, left and right data fields, and guard bars, employed in environments including supermarkets like Safeway and event supply chains for Major League Baseball merchandising. It is distinct from symbologies used by Federal Aviation Administration baggage systems and industrial labels from ISO standards groups.

History and development

Development began in the late 1960s with research involving George J. Laurer at IBM, collaboration with the Uniform Grocery Product Code Council and testing by Supermarket Institute. The first commercial use occurred in 1974 with companies such as Kroger, Marsh Supermarkets, and Grocery Manufacturers Association adopting prototypes. Adoption accelerated after standards work by GS1, influenced by international efforts connected to European Article Numbering Association and input from Federal Trade Commission reviews of retail efficiency.

Format and encoding

The format comprises 12 numerical digits: a number system digit, a 5-digit manufacturer code, a 5-digit product code, and a check digit; assignments are administered by GS1 US and coordinated with GS1 Global Office. The printed symbol displays left-hand and right-hand encodation using odd and even parity patterns consistent with specifications used by barcode printers from Zebra Technologies, Honeywell, and Datalogic. The symbol uses guard patterns similar to those in EAN-13 symbols seen in European retail systems and conforms to element width and height metrics influenced by ANSI and ISO/IEC guidance.

Check digit calculation

The check digit is calculated using a modulo 10 algorithm adopted in standards overseen by ISO/IEC 15420 and implemented in POS software from vendors like NCR Corporation and Verifone. The computation multiplies alternating digits by weights, sums products, and determines the smallest number which, when added, produces a multiple of ten; this method aligns with checksum procedures used in International Standard Book Number checks and legacy systems from Bell Labs research. The calculation ensures detection of single-digit errors and many transposition errors, similar in purpose to checks in Universal Product Code implementations in major retailers like Walmart and Tesco distribution.

Variants and related formats

Related symbologies include EAN-13, EAN-8, UPC-E, and expanded formats such as GS1-128 used by logistics providers like FedEx and UPS. UPC-E acts as a zero-suppressed variant used by manufacturers working with Kraft Foods and Procter & Gamble for small-pack items. Carrier and supply-chain labels integrate UPC-A with standards like Application Identifier schemes employed in GS1-128 and pallet labeling used by Ryder and XPO Logistics.

Usage and applications

UPC-A is used for item identification in retail checkout at chains like Walmart, Target, Costco, and grocery outlets such as Kroger, Safeway, and Ahold Delhaize. It is embedded in product packaging manufactured by Procter & Gamble, Unilever, and Nestlé, and drives inventory management systems from vendors like Oracle Corporation, SAP SE, and Microsoft Dynamics. UPC-A codes appear on tickets, library materials in systems derived from Ex Libris, and merchandise tracking in leagues such as National Football League and Major League Baseball licensing.

Implementation and barcode scanning standards

Implementation follows scanning standards from GS1 US and ISO/IEC committees, with hardware from manufacturers including Honeywell, Zebra Technologies, Datalogic, and Cognex supporting laser and imager readers. Conformance testing uses criteria from ANSI, ISO/IEC 15416, and quality grading systems employed by retailers like Walmart and certification services from Underwriters Laboratories. Integration with POS and ERP systems relies on middleware and SDKs provided by IBM, Oracle Corporation, SAP SE, and handheld devices from Motorola Solutions used in warehousing and distribution centers of Amazon.com and Walmart.

Category:Barcodes