ISSN Checkdigit calculator - by dLSoft

This calculator calculates digits for ISSN numbers only.

For GS1 check digits see the GS1 Checkdigit calculator, and for other 1D barcode types see the Barcode Checkdigit calculator.

ISSN numbers consist of 7 digits plus 1 check digit. To determine the check digit for an ISSN number enter the 7 digit ISSN number in the box below and push the Calculate button.

ISSN number: 


(for Sequence variant 00)

High resolution barcode images may be obtained from the Barcodes Online service