This question cannot be answered sensibly. A square yard is a measure of area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches...
You want to convert a length or distance into an area.
Feet (or yards) measure LENGTH and square feet (or square yards) measure AREA.
Length can never be directly converted to an area. However,...
My father is a carpet installer so we used this all the time. One yard = 3 feet, so an area that is 3 feet by 3 feet would equal one square yard. Since that area contains 9 square feet, then 9 sf = 1...