To choose the right size coffee table, measure your seating area and ensure the table fits well. Ideally, the table should be two-thirds the length of your sofa and about the same height as the seat cushions. Leave at least 18 inches between the table and your seating for comfortable movement. The size should allow easy reach from all seats while maintaining balance in the room. Consider the table’s width and ensure it doesn’t overpower the space, keeping the area open and functional.