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# GS1 Identification Numbers

Field 14 digits(*)
GTIN-8
GTIN-12
GTIN-13
GTIN-14
(*) In databases, GS1 identification numbers must be placed right justified in a 14 digit field

SSCC

# Tips:

How is the check digit calculated?
Example of a check digit calculation for the 13 digit field

# Detailed explanation on how the check digit is calculated:

 Digit positions GTIN-8 N1 N2 N3 N4 N5 N6 N7 N8 GTIN-12 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 GTIN-13 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 GTIN-14 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 N14 SSCC N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 N14 N15 N5% N17 N18 Multiply value of each position by x3 x1 x3 x1 x3 x1 x3 x1 x3 x1 x3 x1 x3 x1 x3 x1 x3 Accumulated results = Sum Substract the sum value of last digit from 10 = Check Digit

# Detailed explanation on how the check digit is calculated:

Example of a check digit calculation for the 13 digit field
 Positions N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 Number without check digit 6 2 9 1 0 4 1 5 0 0 2 1 Step 1: Multiply x x x x x x x x x x x x by 1 3 1 3 1 3 1 3 1 3 1 3 Step 2: Add up = = = = = = = = = = = = results to sum 6 6 9 3 0 12 1 15 0 0 2 3 = 57 Step 3: Substract the sum value of the last digit (7) from 10 = Check Digit (3) Number with check digit 6 2 9 1 0 4 1 5 0 0 2 1 3