## Barcode Check Digit Calculator

Calculate GTIN (EAN/UPC) check digit by entering all the numbers that appear under the barcode.

Barcode number 123456789128 has a correct check digit.

### Check Digit Calculation

Position: | 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
---|---|---|---|---|---|---|---|---|---|---|---|---|

Digits: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | 2 | 8 |

Mutiply digits by: | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | |

= | 3 | 2 | 9 | 4 | 15 | 6 | 21 | 8 | 27 | 1 | 6 | |

Calculate total sum: |
102 | |||||||||||

Calculate modulo 10: | Subtract the from nearest equal or higher multiple of tensum=> 110 - 102 = 8 (check digit) |
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Correct Number: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | 2 | 8 |

### Remarks:

- Check digit is the right most digit in the barcode number.
- Multipliers of 3,1,3,1 ... are always applied from the right to the left of the symbol. This way both EAN-13 and UPC-A will have same check digit (since UPC-A carries same data with one additional 0 on the left).