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The Global Language of Business
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The Global Language of Business
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  3. How to calculate a check digit manually

How to calculate a check digit manually

ID Key FormatDigit positions
GTIN-8          N1N2N3N4N5N6N7N8
GTIN-12      N1N2N3N4N5N6N7N8N9N10N11N12
GTIN-13     N1N2N3N4N5N6N7N8N9N10N11N12N13
GTIN-14    N1N2N3N4N5N6N7N8N9N10N11N12N13N14
GSIN N1N2N3N4N5N6N7N8N9N10N11N12N13N14N15N16N17
SSCCN1N2N3N4N5N6N7N8N9N10N11N12N13N14N15N16N17N18
Step 1: Multiply value of each position by
 x3x1x3x1x3x1x3x1x3x1x3x1x3x1x3x1x3 
Step 2: Add results together to createsum
Step 3: Subtract the sum from nearest equal or higher multiple of ten =Check Digit

The following table gives an example to illustrate how a GTIN-13 Check Digit is calculated:

ID Key FormatN1N2N3N4N5N6N7N8N9N10N11N12N13
Numberwithout Check Digit629104150021-
Step 1: Multiplyxxxxxxxxxxxx-
by131313131313-
Step 2: Add results============-
to createsum66930121150023=57
Step 3: Subtract thesum from nearest equal or higher multiple of ten = 60- 57 = 3 (Check Digit)
Numberwith Check Digit6291041500213
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