24.1m units predicted, and the lion's share will be iPads.
10.3 million consumer tablets were sold in the US last year, according to Forrester's latest research - an increase on its original prediction of 3.5 million units for the year.
The company thinks the revised figure will more than double in 2011, too, to 24.1 million units.
"Of those sales, the lion's share will be iPads, and despite many would-be competitors that will be released at CES, we see Apple commanding the vast majority of the tablet market through 2012," writes analyst Sarah Rotman Epps.
Forrester predicts US consumer tablet sales will then rise to 35.1 million units in 2012, 39.8 million in 2013, 42.3 million in 2014 and 44 million in 2015.
Epps writes that Forrester now thinks the replacement rate for tablets will be more like MP3 players or smartphones than like PCs.
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"Tablets are proving themselves to be "lifestyle devices" at home and at work, and as such we think consumers will upgrade to newer models more rapidly than they would a more utilitarian device like a PC," she writes.
"We think a significant number of first-generation iPad buyers will buy iPad 2 when it comes out this year."
