146 X 12

What size sofa there is for a 12' x 12' room depends on the layout of the space. Generally, a sofa should be about two-thirds of the length of the closest wall. For a 12' x 12' room, that works out to around 95 inches. However, you should leave three feet of space around the sofa to make it easy to navigate your seating area. Depending on what other furnishings you wish to put in the space, you may need to opt for a shorter sofa to allow enough clearance around the piece. Find a diverse assortment of sofas on 1stDibs.

In the U.S., rugs are typically measured in feet, so a 9 x 12 rug would be nine feet by 12 feet. In other countries, rugs will be measured in the country's respective unit of measurement. Most countries use meters rather than feet.