## Calculate the Check Digit

The Check Digit is easy to calculate. This is how you do it.

The letters of the prefix have a certain value:

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
---|---|---|---|---|---|---|---|---|---|

A | 10 | G | 17 | M | 24 | S | 30 | Y | 37 |

B | 12 | H | 18 | N | 25 | T | 31 | Z | 38 |

C | 13 | I | 19 | O | 26 | U | 32 | ||

D | 14 | J | 20 | P | 27 | V | 34 | ||

E | 15 | K | 21 | Q | 28 | W | 35 | ||

F | 16 | L | 23 | R | 29 | X | 36 |

So (for example) prefix MWCU is:

1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|

Letter | M | W | C | U |

Value | 24 | 35 | 13 | 32 |

The value of the numbers is equal to the numbers of the container number.

1 | 2 | 3 | 4 | 5 | 6 | 7 |
---|---|---|---|---|---|---|

Number | 6 | 0 | 5 | 9 | 7 | 8 |

Value | 6 | 0 | 5 | 9 | 7 | 8 |

Now calculate like this:

1 | 2 | 3 | 4 | 5 | 6 |
---|---|---|---|---|---|

M | 24 | X | 1 | = | 24 |

W | 35 | X | 2 | = | 70 |

C | 13 | X | 4 | = | 52 |

U | 32 | X | 8 | = | 256 |

6 | 6 | X | 16 | = | 96 |

0 | 0 | X | 32 | = | 0 |

5 | 5 | X | 64 | = | 320 |

9 | 9 | X | 128 | = | 1152 |

7 | 7 | X | 256 | = | 1792 |

8 | 8 | X | 512 | = | 4096 |

The total, in this case 7858 is divided by 11 (Long Division) and the remainder is the Check Digit.

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

1 | 1 | / | 7 | 8 | 5 | 8 | 7 | 1 | 4 | |

7 | 7 | |||||||||

1 | 5 | |||||||||

1 | 1 | |||||||||

4 | 8 | |||||||||

4 | 4 | |||||||||

4 |