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Amazon.com customers are now purchasing more Kindle books than all print books - hardcover and paperback - combined. Since April 1, for every 100 print books Amazon.com has sold, it has sold 105 Kindle books. This includes sales of hardcover and paperback books by Amazon where there is no Kindle edition; free Kindle books are excluded from that number and, if included, would make the number even higher.

Amazon sold more than three times as many Kindle books so far in 2011 as it did during the same period in 2010. And so far in 2011, the growth of Kindle book sales, combined with the continued growth in Amazon's print book sales, have resulted in the fastest year-over-year growth rate for Amazon's U.S. books business, in both units and dollars, in over 10 years. This includes books in all formats, print and digital. Free books are excluded in the calculation of growth rates.

Amazon began selling hardcover and paperback books in July 1995. Twelve years later in November 2007, Amazon introduced the Kindle and began selling Kindle books. By July 2010, Kindle book sales had surpassed hardcover book sales, and six months later, Kindle books overtook paperback books to become the most popular format on Amazon.com.

The U.S. Kindle Store now has more than 950,000 books, including New Releases and 109 of 111 New York Times Best Sellers. Over 790,000 of these books are $9.99 or less, including 69 New York Times Best Sellers. Millions of free, out-of-copyright, pre- books are also available to read on Kindle devices. More than 175,000 books have been added to the Kindle Store in just the last 5 months.