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Calculation of Code93 Modulo 47 Check Character

For example if the data "12345678" is to be encoded as a barcode. The check character is calculated as follows.

  
ASCII Characters12345678 
Code 93 Values12345678 
From the rightmost digit, multiply the value by a weight starting from 1. If the weight is greater than 20, restart the value from 1. Sum up all the values.
Check C Weight*8*7*6*5*4*3*2*1 
Check Digit C Sum :1*8 + 2*7 + 3*6 + 4*5 + 5*4 + 6*3 + 7*2 + 8*1 = 120
Modulo 47 Check Digit C :120 % 47 = 26 'Q'
Code 93 Values with Check Digit C1234567826
From the rightmost digit, multiply the value by a weight starting from 1. If the weight is greater than 15, restart the value from 1. Sum up all the values.
Check K Weight*9*8*7*6*5*4*3*2*1
Check Digit K Sum :1*26 + 2*8 + 3*7 + 4*6 + 5*5 + 6*4 + 7*3 + 8*2 + 9*1 = 182
Modulo 47 Check Digit K :182 % 47 = 41 '+'


The characters "12345678Q+" can then be keyed in to the text editor with the appropriate font selected to generate a Code 93 barcode with check characters.

Back to Code 93 Barcode Font

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