Over the past three months, for every 100 hardcover books Amazon.com has sold, it has sold 143 Kindle books. Over the past month, for every 100 hardcover books Amazon.com has sold, it has sold 180 Kindle books. This is across Amazon.com's entire U.S. book business and includes sales of hardcover books where there is no Kindle edition. Free Kindle books are excluded and if included would make the number even higher.
Amazon sold more than three times as many Kindle books in the first half of 2010 as in the first half of 2009.
The Association of American Publishers' latest data reports that eBook sales grew 163 percent in the month of May and 207 percent year-to-date through May. Kindle book sales in May and year-to-date through May exceeded those growth rates.
On July 6, Hachette announced that James Patterson had sold 1.14 million eBooks to date. Of those, 867,881 were Kindle books.
Five authors--Charlaine Harris, Stieg Larsson, Stephenie Meyer, James Patterson and Nora Roberts--have each sold more than 500,000 Kindle books.
Amazon.com says its KindleeBook format offers the largest selection of the most popular books people want to read. The U.S. Kindle Store now has more than 630,000 books, including new releases and 106 of 110 New York Times Best Sellers. Over 510,000 of these books cost $9.99 or less, including 75 New York Times Best Sellers. Over 1.8 million free, out-of-copyright, pre-1923 books are also available to read on Kindle.