The MSI Mod 11 check digit is calculated as follows:
The example bar code data is:
943457842
1.Assign a checking factor to each number, starting with the units position of the number (in this example, the 2) up to the highest order position (the 9). Use checking factors of:
2,3,4,5,6,7,2,3,4,5,6,7...
2.Multiply the checking factor with its assigned number and add the products:
4 + 12 + 32 + 35 + 30 + 28 + 6 + 12 + 36 = 195
3.Divide the sum by 11
195/11 = 17 remainder 8
4.Subtract remainder from 11
11 - 8 = 3
5.New Check Digit
3
(If the remainder is 10, no check digit is added.)
6.Data with check digit is:
9434578
46
