How do you convert square footage to linear footage?

Divide the square footage by the width in feet. Example: 20 sq. ft roll of material is made up of 10 linear feet by 2 feet in width. 20 square feet divided by 2 feet wide equals 10 linear feet and 2 feet wide. For linear feet ask yourself how long is it.

100 sq. ft. 1 foot wide would be 100 linear feet long.