An ISBN converter (from 10 to 13 digits and the reverse) is found at

In January 2007 the book industry moved the ISBN standard from 10 to 13 digits to accommodate the numerous books being published world-wide. 13-digit ISBNs all start with 978. The following nine digits are the same as the first nine digits in the previous 10-digit ISBN. The last digit will differ. The last digit is a check digit that comes from a mathematical equation. For those interested the equation can be found at

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