Newzoo has announced that the total number of Kindle Fires sold by Amazon has surpassed the 10 million unit mark by the end of the first quarter of 2012 and the number of people in the U.S. who actively use a Kindle fire reached 17.4 million, compared to 30.5 million active users for the iPad. There are 59 million total active tablet users in the U.S. while 36 percent of these consumers actively plays games on their tablet.

“We will continue to closely monitor the fascinating developments of tablets and smartphones, and not only in relation to mobile gaming,” says Newzoo’s CEO Peter Warman. “Our recent research shows that the Kindle Fire should be considered as a real tablet computer and clearly is a very credible competitor to the iPad, in particular given the vast amount of various kinds of content Amazon can make available to its users.”

Furthermore, Newzoo says 81 percent of the active users of Kindle Fire play mobile games on tablets, smartphones or an iPod touch, compared to 77 percent for the iPad users. Roughly 43 percent of the U.S. online population aged 10 to 65 plays mobile games totaling 100 million Americans, with 69 percent of U.S. mobile gamers playing games on a smartphone, 21 percent on a tablet, 18 percent on an iPod Touch.