Tuesday, 11 December 2012

Calculating the check digit for a UPC Barcode Company Label

The last digit of an UPC-A Barcode is a computer check digit. This is how you calculate it for your company labels
Using the above UPC-A Barcode reading 01234567891(2), which is made up of 11 digits plus a final check digit which in this case is the number 2.
The calculation is:
Step 1. Start by adding the first digit (left to right method in this case 0) with each alternate digit
i.e. in this case 0,2,4,6,8,1 = 21 and times the total by 3 = 63 (Red Group)
Step 2.  Now add the unused digits digits in this case 1,3,5,7,9, = 25 (Blue Group)
Step 3 Add the two totals in Step 1 and Step 2 together i.e. 63 + 25 = 88.
Step 4 The check digit is the smallest number when added to the result that produces a multiple of 10.
So for this Barcode the check digit is 2   i.e. 88 + 2 = 90
Now you can make sure you supply the correct number to your Graphic Designer
or simply impress your friends in the bar or pub.

UPC barcode check digit calculator 2013.

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