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Check Digit Calculator

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The last digit of a bar code number is a computer Check Digit which makes sure the bar code is correctly composed.

This page contains the following information:

 

How to calculate a Check Digit manually

 

ID Key
Format

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

N16

N17

N18

Step 1: Multiply value of each position by

 

x3

x1

x3

x1

x3

x1

x3

x1

x3

x1

x3

x1

x3

x1

x3

x1

x3

 

Step 2: Add results together to create sum

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 Check Digit is calculated:

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 results

=

=

=

=

=

=

=

=

=

=

=

=

-

to create sum

6

6

9

3

0

12

1

15

0

0

2

3

= 57

Step 3: Subtract the sum from nearest equal or higher multiple of ten = 60- 57 = 3 (Check Digit)

Number with Check Digit

6

2

9

1

0

4

1

5

0

0

2

1

3

 
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