Choosing the right sofa size starts with measuring your living room carefully. Ensure at least three feet of clearance for walkways around the sofa and avoid a piece that overwhelms the space. For example, a seventy two inch sofa in a ten by twelve foot room can feel cramped unless you float it six inches off the wall and maintain a thirty two inch path to other areas like the balcony. Prioritize seat depth supporting your body comfortably and test scale by marking sofa dimensions on your floor before purchase.