The way to calculate a rectangular area is by measuring the length and width of your area then multiplying those two numbers together to get the area in feet squared (ft2). If you have on oddly shaped area, such as an L-shape, split it into square or rectanglualar sections and treat them as two separate areas.How do you calculate total sq ft?
When calculating sq in to sq ft divide the sq in by 144 to get sq ft. A sq foot is 12in by 12in or 144 sq in. So your 1 board example is 1.133 sq foot. to find out the entire room add up all the sq in then divide by 144 to give you the total sq ft.