Check Digit Calculator

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:


GTIN Check Digit Calculator

ID Key Format
Item Reference
(without Check Digit)
 
Check
Digit
Global Trade Item Number (GTIN)
GTIN-8
(Enter 7 digits)
GTIN-12
(Enter 11 digits)
GTIN-13
(Enter 12 digits)
GTIN-14
(Enter 13 digits)

GLN Check Digit Calculator

ID Key Format
Item Reference
(without Check Digit)
 
Check
Digit
Global Location Number (GLN)
GLN
(Enter 12 digits)

SSCC Check Digit Calculator

ID Key Format
Item Reference
(without Check Digit)
 
Check
Digit
SSCC
(Enter 17 digits)

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 GTIN-13 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