This page is meant as a very basic tool to aid users of the Damm check digit algorithm. I created this for my own uses but hope that it may be helpful for someone else too! This tool uses only client-side javascript which can be reviewed by looking at the page source.
Calculate Damm Check Digit
Enter a number into the box and the check digit will be appended below.
Enter Number To Calculate
Verify Damm Check Digit
Enter a number to test the last digit as a Damm check digit. Text below the box will display if the number is valid or invalid.
Enter Number To Verify
