How to calculate the check digit

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DIET COKE

4890008101306

Let us denote the 13 digits as following:

N1  N2  N3  N4  N5  N6  N7  N8  N9  N10  N11   N12   N13


N1---N3      	Country Code
N4---N7		Manufacturer Code
N8---N12	Product Code
N13		Check Digit

We'll calculate the check digit by following the steps below:

1. EVEN =  ( N2 + N4 + N6 + N8 + N10 + N12 ) * 3
2. ODD   =  N1 +  N3 + N5 + N7 + N9 + N11
3. TOTAL =  EVEN + ODD
4. Divide TOTAL by 10 and let the remainder be  R
5. If   R  is 0  then change  R  to  10
6. N13 = 10 - R


We  use the Diet Coke  code as our example.  The code for Diet Coke is
4 89000810130

EVEN = ( 8 + 0 + 0 + 1 + 1 + 0 ) *3
            = 30
ODD   =  4 + 9 + 0 + 8 + 0 + 3
            =  24

TOTAL  =  30 + 24
	 =  54

Divide  54  by 10 , we get a remainder of   4

N13 =  10 - 4
        =   6
The check digit is 6

You always see the code 4890008101306 on the can of Diet Coke!
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