What is the standard length of a couch?

A standard three-seat sofa measures approximately 35 inches deep by 84 inches wide. A typical loveseat sofa measures about 35 inches deep by 60 inches wide.

While furniture measurements are only approximate, most share similar sizes regardless of style and manufacturer. This applies to other types of furniture as well, including dining tables, coffee tables and beds. A typical coffee table, for instance, measures approximately 30 inches in width by 48 inches in length, whereas a dining table with a single leaf typically measures about 36 by 72 inches. Twin-sized beds generally measure about 39 by 80 inches, whereas a California king bed measures approximately 72 by 82 inches.