At the Untethered conference, Forrester Research projected the U.S sales figures of different PC form factors – Tablets, Netbooks, Notebooks & Desktop – for the next 5 years. Tablet sales, they say would overtake netbook sales in 2 years time and Desktop sales by 2013. Tablet sales (iPad + Others) this year is pegged at 3.5 million growing to 20.4 million in 2015. Apple has sold nearly 2 million iPads so far and according to TechCrunch, it could blow past Forrester estimate all by itself in 2010.

In the PC unit sales market of U.S, tablets would gain from a 6% market share to 23% on a four year time horizon. The rate at which tablets are gaining popularity and with new players making a foray into this market, these projections by Forrester could prove to be on the conservative side. By 2015, Forrester states that only Laptops would outsell the tablets.

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Graph + Content Credit: Forrester + TechCrunch