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Calculation of Postnet Check Character
For example if the data "12345" is to be encoded as a barcode. The check digit is calculated as follows.
| Data | 1 | 2 | 3 | 4 | 5 |
| Sum : | 1 + 2 + 3 + 4 + 5 = 15 |
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If Sum Modulo 10 equals 0, the result is 0.
Otherwise the result is 10 - (Sum Modulo 10)
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| Modulo 10 : | 10 - (15 % 10) = 5 |
| Data to be encoded | 123455 |
| Add Start/Stop characters | {123455} |
The characters "{123455}" can then be keyed in to the text editor with the appropriate font selected to generate a Postnet barcode with check digit.
Back to Postnet Barcode Font
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