How big is too big for a laptop? You can find laptops in all kinds of sizes, with the smallest ones being about 11 inches and the biggest ones being much bigger than this. The bigger laptops can occasionally be considered too unwieldy to actually serve their purpose — to be portable — but they're still a pleasure to use. Case in point, Alienware just released one of its biggest laptops to date, the newest model in the m18 series.