what  is the average length  of a sofa?
An average outside measure of a sofa is 86 inches wide (long), 38 inches deep and 37 inches high. The inside measures are important because you want to have just enough room to lay down or seat more people. If you are petite, 19-21 inside inches depth is enough. But if you are tall, get a couch that has 22-24 inches inside depth. The same about the height of the sofa back. Overall Height: While average height is 37 inches, some contemporary sofas are 33-34 inches. If you choose a couch that is 40-44 inches high, which is quite unusual, make sure you have a place against the wall since it will not look good in the middle of the room, floating.