Barcode Check Digit Calculator

Choose the barcode type and enter the number. If you leave out the last digit, the calculator returns it and the complete number. If you enter the complete number, it tells you whether the check digit is correct and, if not, which digit it should be.

EAN-13, EAN-8, UPC-A, UPC-E, ITF-14, GTIN-14, ISBN-10 and ISBN-13. Spaces and hyphens are ignored, and a leading ISBN label is accepted for the ISBN types.

For EAN, UPC, ITF-14 and GTIN numbers the digits are weighted 3 and 1 alternately from the right, summed, and the check digit is the amount needed to reach the next multiple of 10. ISBN-13 uses the same method.

The nine digits are weighted 10 down to 2, summed, and the check digit makes the total divisible by 11. A remainder of 10 is written as X, which is why some ISBN-10 numbers end in X.

Enter 6 digits, 7 digits with the number system 0 or 1, or 8 digits with the check digit. The calculator expands the number to UPC-A following the zero suppression rules, calculates the check digit from it and shows the expanded UPC-A number.

Yes. For an ISBN-10 the result includes the ISBN-13 with the 978 prefix and its new check digit, and for an ISBN-13 starting with 978 it includes the ISBN-10. ISBN-13 numbers starting with 979 have no ISBN-10 form.

Both are 14 digit GTINs with the same GS1 check digit, so the result is the same. ITF-14 names the barcode printed on cartons and GTIN-14 the number itself, and both are listed so you can pick the term you know.

The number contains letters or symbols other than spaces and hyphens, or it has the wrong length for the chosen type. The message states how many digits the type needs with and without its check digit.

No. The check digit only shows that the number is well formed. Whether a GTIN is licensed to a company is recorded by GS1, and its Verified by GS1 service can look that up.

Yes. Copy the complete number into the EAN-13, EAN-8, UPC-A, UPC-E, ITF-14 or ISBN Barcode Generator to draw the barcode as PNG or SVG.