What size room will 22.5 square feet of laminate cover?

The only answer is the trivial answer: 22.5 square feet. The area does not determine thye dimensions of the room. 22.5 square feet could be a room that is circular with a radius of approx 2.68 feet or it could be a room that is 1 mile lonf and only 0.0043 feet = 0.051 inches wide. It could be narrower still!