Mod 43 Check Digit
Mod 43 Check Digit

Mod 43 Check Digit

This section lists the calculations for determining the Mod 43 check Digit character.
The calculations for determining the Mod 43 check Digit character are as follows:
Each character in the Code 39 character set has a specific value, as follows:
0=0
B=11
X=33
1=1
C=12
Y=34
2=2
D=13
Z=35
3=3
E=14
- =36
4=4
F=15
. =37
5=5
G=16
Space = 38
6=6
H=17
$=39
7=7
I=18
/=40
8=8
J=19
+=41
9=9
K=20
%=42
A=10
L=21
Example
Data string 2345ABCDE/
  1. Add the sum of all the character values in the data string. Using the chart above, the sum of the character values is as follows:
    1 + 2 + 3 + 4 + 5 + 10 + 11 + 12 + 13 + 14 + 40 =115
  2. Divide the total by 43. Keep track of the remainder.
    115/43 = 2 Remainder is 29
  3. The “check digit” is the character that corresponds to the value of the remainder.
    Remainder = 29
    29 is the value for the letter T.
    T is the check digit.
    Below is a bar code that illustrates the example. The character on the right, T, is the check digit.