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I'm doing a research and I'm would like to know actually how many copies of a specific book has been sold until now. I really don't know where can I find this number and what is the more accurate way to get an accurate value.

A pratical example:

How many copies of Bright Earth: The Invention of Colour (2001) by Philip Ball have been sold until now?

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Only the publisher knows. Bestseller lists, such as the New York Times bestseller lists, are extrapolations from the sales of a representative selection of book sellers. You'd need access to a similar sample to calculate copies sold. That data is not public. –  what Nov 8 '13 at 22:36
@what thanks! So I've no possibilities to extrapolate the date form other sources.... –  G M Nov 8 '13 at 22:37
As far as I know, no. See also: lib.umn.edu/faq/108 Nielsen BookScan UK offers a free trial access to their sales data for a limited time: nielsenbookscan.co.uk/controller.php?page=106 (click "Register" on the right). I'm not sure if they will admit you, but you could try and get access to the books that you look for. Probably Nielsen USA does the same. Google for this. –  what Nov 8 '13 at 23:18
You can also look at Amazon or other sellers' rankings. –  Leon Conrad Mar 5 at 0:50

1 Answer 1

Yes, you can, but it's expensive and not 100% reliable. See http://www.nielsenbookscan.co.uk/controller.php?page=48

There used to be a $85 book research service through a company called The Book Standard, but they are no longer in business.

You can try and extrapolate what current Amazon sales are like. See http://www.fonerbooks.com/surfing.htm

Also, see the calculator that basically does the same thing for Amazon: http://kdpcalculator.com/index.php

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