How many shingle squares does it take to roof a 2000 square foot home?

A square covers 1oo square feet so I would buy at least 21 Squares ( a little extra for starter courses) and any valley cuts etc. make sure the provider store has stock colors and textures always at hand for any repairs you might have to make in the future. That's one reason to buy a few more bundles than you really need, because you'll probably need some later.