Choosing the right sofa size starts with measuring your room carefully. Leave at least thirty to thirty-six inches of clearance for walkways around the sofa to allow easy movement. Consider sofa length in relation to the room’s width, and include space for side tables if desired. Also, factor in seat height and depth for comfort and proportion. Using tools or digital mockups helps visualize sofa dimensions before purchasing. This approach prevents returns and ensures a cozy, functional seating area.