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Check digit calculator
 To calculate the check digit for the new ISBN-13 see below.
UPC-A/UPC-E (zero suppression) convertor
Check digit calculation explained
To calculate the check digit of an UCC-12 (UPC-A) with number 0 12345 12345 follow the following five steps.
Step one: From the right to the left, start with odd
position, assign the odd/even position to each digit.
| Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
| Digit |
0 |
1 |
2 |
3 |
4 |
5 |
1 |
2 |
3 |
4 |
5 |
| Position |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (0+2+4+1+3+5)*3=45
Step three: add all digits in even position: (1+3+5+2+4)=15
Step four: add the results of step three and four: 45+15=60
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 70-60=10, so the check digit is 0.
To calculate the check digit of an UCC-13 (EAN-13) with number 87 12345 12345 follow the following five steps.
Step one: from the right to left, start with odd position, assign the odd/even position to each digit.
| Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
| Digit |
8 |
7 |
1 |
2 |
3 |
4 |
5 |
1 |
2 |
3 |
4 |
5 |
| Position |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (7+2+4+1+3+5)*3=66
Step three: add all digits in even position. (8+1+3+5+2+4)=23
Step four: add the results of step three and four: 66+23=89
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 90-89=, so the check digit is 1.
To calculate the check digit of an EAN/UCC-14 (EAN-14) with number 1 87 12345 12345 follow the following five steps.
Step one: from the right to left, start with odd position, assign the odd/even position to each digit.
|
Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
|
Digit |
1 |
8 |
7 |
1 |
2 |
3 |
4 |
5 |
1 |
2 |
3 |
4 |
5 |
|
Position |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (1+7+2+4+1+3+5)*3=69
Step three: add all digits in even position: (8+1+3+5+2+4)=23
Step four: add the results of step three and four: 69+23=92
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 100-92=8, so the check digit is 8.
To calculate the check digit of an SSCC with number 12 345678901234567 follow the following five steps.
Step one: from the right to left, start with odd position, assign the odd/even position to each digit.
|
Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
|
Digit |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
Position |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (1+3+5+7+9+1+3+5+7)*3=123
Step three: add all digits in even position: (2+4+6+8+0+2+4+6)=32
Step four: add the results of step three and four: 123+32=155
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 160-155=5, so the check digit is 5.
To calculate the check digit of an EAN/UCC-8 with number 87 12345 follow the following five steps.
Step one: From the right to left, start with odd position, assign
the odd/even position to each digit.
|
Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
Digit |
8 |
7 |
1 |
2 |
3 |
4 |
5 |
|
Position |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (8+1+3+5)*3=51
Step three: add all digits in even position: (7+2+4)=13
Step four: add the results of step three and four: 51+13=64
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 70-64=6, so the check digit is 6.
To calculate the check digit of an ISBN or ISSN with number 0-123-45678 follow the following five steps.
Step one: arrange the 9-digit ISBN number in a table. Starting from the left, fill in the weight row with number from 10 to 2.
|
index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
|
digit |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
weight |
10 |
9 |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
Step two: multiply each digit with its weight and sum the results of multiplication: 0*10+1*9+2*8+3*7+4*6+5*5+6*4+7*3+8*2=156
Step three: divide the sum by modulus 11 and get the remainder: 156:11=14.2, remainder is 2
Step four: the check digit is the number that adds the remainder to 11. (If the result is 10, then check digit is the character X) 2+9= 11 The check digit is 9.
Step five: generate the complete ISBN with hyphens: 0-123-45678-9.
The method to calculate the checkdigit of an ISBN-13 is identical to the method for an EAN/UCC-13 (EAN-13). To calculate the check digit of an ISBN-13 with number 978-0-123-45678 follow the following five steps.
Step one: from the right to left, start with odd position, assign the odd/even position to each digit.
| Index |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
| Digit |
9 |
7 |
8 |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
| Position |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
even |
odd |
Step two: add all digits in odd position and multiply the result by 3: (7+0+2+4+6+8)*3=81
Step three: add all digits in even position. (9+8+1+3+5+7)=33
Step four: add the results of step three and four: 81+33=114
Step five: substract the sum from the next highest multiple of ten, the result is the check digit. (If the result is 10 then the check digit is 0): 120-114=6, so the check digit is 6.
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