Image
EAN-13	0000001007145
UPC-A	000001007145
Product Name	Styrofoam Core Tank Float - 10 10in. Styrofoam Tank Float
Language	English
Category	Hardware
Amazon.com	Buy on Amazon ~ B0002YPL2G
Binding	Misc.
Features	Operates high & low cut-off valves Withstands winter & summer conditions Can be perforated and still performs its task 6 per carton
Created	07-01-2006
Modified	11-21-2016 1:44:05pm
MD5	083787a09ca64969c0aa2d2f83b92c24
SHA256	cd52100330f61a82691d891d0836344f937b845792b1992776052039fb134a59
Search Google	by EAN or by Title
Query Time	0.0044060

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.

• Lets start with ISBN-10 number 1-5905-9332-?
• 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.