Non-digit characters are ignored. 11 digits entered — looks like UPC-A data.
Check digit
2
Full number: 036000291452
How the check digit is calculated
Starting from the data digit immediately to the left of where the check digit goes, and moving left, multiply digits alternately by 3 and by 1 (first digit ×3, next ×1, next ×3, and so on). Sum all the weighted values, then the check digit is whatever single digit brings that sum up to the next multiple of 10 — formally, (10 − (sum mod 10)) mod 10.
UPC-A and EAN-13 use the identical algorithm; EAN-13 just has one additional data digit ahead of the same alternating 3/1 weighting pattern. This is also the same underlying check-digit method used across the wider GS1 GTIN numbering system see the GS1 barcode standards guide for how the rest of a GTIN is structured, or the barcode generator to turn a validated number into a scannable image.
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