How big should a living room rug be? Drag it under the sofa and see

A rug that's too small makes a living room feel unsettled; the right size ties the sofa and coffee table into one cosy group.

Drag a rug around a top-down plan of a living room, change the sofa width and rug size, and watch live checks for front legs on, the coffee table, the sides and the gap to the walls. Includes the rules of thumb, when to break them, and how to tape out a rug before you buy.