Calculate > Calculate your check character pair from your GMN (Basic UDI-DI) without check characters.
Validate > Perform checks on the complete GMN (Basic UDI-DI) including check characters.
The last two characters of the basic UDI-DI are check characters calculated on the previous characters used. The calculator is specifically for a maximum of 25 characters including the check character pair for the Basic UDI-DI. Use our check character calculator above to calculate the check character pair.
The check character pair are two uppercase alpha and numeric characters used to detect potential character keying and encoding errors. The GMN (Basic UDI-DI) has a mandatory check character pair.
This document describes how GS1 barcodes and identification keys including GMN should be used.
GS1 General Specifications
To know more about what GS1 does in the Healthcare sector
More information available here:Unique Device Identification (UDI)