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UPC check digit calculation

The check digit in a Universal Product Code (UPC) is used to detect errors in the scanning or manual entry of the barcode. The calculation of the check digit for a UPC-A barcode involves the following steps:

1. Identify the 11 digits: A UPC-A barcode consists of 12 digits. The first 11 digits are the data digits, and the 12th digit is the check digit.

2. Sum of digits in odd positions: Add together all the digits in the odd positions (1st, 3rd, 5th, 7th, 9th, and 11th). These are the digits at positions 1, 3, 5, 7, 9, and 11.

3. Multiply by 3: Multiply the sum obtained in step 2 by 3.

4. Sum of digits in even positions: Add together all the digits in the even positions (2nd, 4th, 6th, 8th, and 10th). These are the digits at positions 2, 4, 6, 8, and 10.

5. Total sum: Add the result of step 3 to the sum obtained in step 4.

6. Modulo 10: Find the modulo 10 of the total sum from step 5 (i.e., the remainder when the total sum is divided by 10).

7. Check digit: If the result from step 6 is 0, then the check digit is 0. Otherwise, subtract the result from 10 to get the check digit.

Example Calculation

Let's go through an example with a UPC-A code: 03600029145.

1. Data digits: 03600029145 (ignoring the last digit for now)

2. Sum of digits in odd positions:

1st digit: 0

3rd digit: 6

5th digit: 0

7th digit: 2

9th digit: 1

11th digit: 5

Sum = 0 + 6 + 0 + 2 + 1 + 5 = 14

3. Multiply by 3: 14¡Á3=4214¡Á3=42

4. Sum of digits in even positions:

2nd digit: 3

4th digit: 0

6th digit: 0

8th digit: 9

10th digit: 4

Sum = 3 + 0 + 0 + 9 + 4 = 16

5. Total sum: 42+16=5842+16=58

6. Modulo 10: 58mod??10=858mod10=8

7. Check digit: 10?8=210?8=2

So, the check digit for the UPC-A code 03600029145 is 2. The full UPC-A code with the check digit is 036000291452.

This process ensures that the check digit will help detect any single-digit errors or simple transpositions in the UPC-A barcode.

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How to Start	Input Data	Import Excel Data	Print Barcode	Barcode Format
Label Designer	All Screen Shot	Export Barcode Image	Save Template	Output Word Excel

How to Use & FAQ:

Text Beneath the Barcode	Configuring Barcode Size
Auto Calculate the Barcode Size	Export Barcode images
Export Barcode Image Format	File Names for Exported Barcode
Resolution of Exported Barcode Images	Fixed Folder for Exporting Barcode
Default Barcode Image Export Format	Print bulk barcodes quickly
Print barcodes to Avery 5160 label	How to bulk Barcode Printing
Sample - Avery 5162 (2x7) Label Sheet	Example: Print barcodes to 5*3cm roll
Example: Print barcodes to 5161 label	Example: Print barcodes to 5162 label
Example: Print barcodes to 5163 label	Example: Print barcodes to 5164 label
Example: Print portrait orientation 5164	Example: Print barcodes to 5167 label
Example: Print barcodes to 5168 label	Example: Print portrait orientation 5168
Example: Print barcodes to 5169 label	Example: Print barcodes to 5660 label
Example: Print barcodes to 5661 label	Example: Print barcodes to 5662 label
Example: Print barcodes to 5663 label	Example: Print barcodes to 5664 label
Example: Print portrait orientation 5664	Example: Print barcodes to 5873 label
Example: Print barcodes to 5874 label	Two ways to import Excel data
Import Excel Data - Pro Edition	Import Excel Data - Std Edition
Import Data from Excel - Detail	Load Data From Excel File
Data Editing Table	Copy Data From Excel
Four ways to input barcode data	Add ASCII Key E
Input Multiple Lines of Text for Barcodes	Generates Sequential Serial Numbers
Import or copy data from Excel sheets	Special sequence number generation
Std Details: Simple Input Form	Std Details: Multiple Line Text Input
Details: Sequence Barcode Generator	Examples: Sequence Barcode Generator
Import Data From Excel Spreadsheet	Barcode Data Correspondence Diagram

Highlights

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Suitable Use Cases

Small businesses and startups needing quick barcode labels for products.

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Educational and testing environments where barcodes are used for tracking.

CONTACT

cs@easiersoft.com

If you have any question, please feel free to email us.

https://free-barcode.com

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