how many sq ft in a linear ft
You don't. A linear foot is 1 foot. A square foot is 1 ftÂ². Linear measure is given when one wants eg to describe density, as 1 lb/ft = 1 PLF, where 1 lb/sq ft = 1 PSF, and 1 PCF = 1 lb/cu ft. Written Jun 6, 2015.