EAN-13 0025325120165 UPC-A 025325120165 Product Name Ar Tp Sw Sau Short Description Each Created 07-01-2006 Modified 07-27-2018 2:24:27pm MD5 5779ed2a7b616e07c36dea96a57f4f3c SHA256 6dd6d0d8c94a455b3ed94fb13557894aa34a15f34a4c3db8a88e3a1b21587a61 Search Google by EAN or by Title Query Time 0.0075750

### Article of interest

ISBN stands for International Standard Book Number. Originally this was a 10 digit number known as ISBN-10, but has been replaced with a 13 digit version known as ISBN-13 (aka EAN-13) to better fit in with the industry standard product numbering system.

The ISBN system offers a unique numbering system for books and publications of various types. ISBN offers 9 identification digits for each book or publication and one check digit. ISBN-13 expands the available number set by doubling the available numbers. You might think that the extra three digits would more than double the available numbers but ISBN is limited within the EAN-13 numbering system and will always start with 978 or 979 as the first three digits, leaving only 9 more digits for the actual identification digits and again the last digit is the check digit.

Any ISBN-10 number can be converted to ISBN-13. Any ISBN-13 number that starts with 978 can be converted back to ISBN-10. ISBN-13 numbers that start with 979 cannot be converted to ISBN-10.

The conversion process from ISBN-10 to ISBN-13 is a rather simple one. Start with the first 9 digits of the ISBN-10 number, place 978 in front and calculate the new check digit using the standard EAN check digit calculation.

If you want to calculate the check digit for ISBN-10, that is done using a MOD-11 calculation that is very different than the EAN check digit process.

• Each digit is multiplied by its position for digits 1-9
• 1x1 + 5x2 + 9x3 + 0x4 + 5x5 + 9x6 + 3x7 + 3x8 + 2x9 = 180
• Now get the remainder 180 mod 11 = 4
• Now return the mod 11 again... 4 mod 11 = 4
• If the results is 10, return the letter X otherwise return the digit.
• For our example, the final number is 1-5905-9332-4

ISBN-1-5905-9332-4

Look at the number above and below the barcode. You will see that except for the last digit in the ISBN number, all of the digits exist in the 13 digit version shown under the barcode right after the 978 and just before the new check digit of 5.

Now you can see how easy it is to convert between ISBN-10 and ISBN-13.

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