You want to convert an area into a length or distance.
Square feet measures AREA and linear yards measure LENGTH.
Area could never be converted to length.
You could convert sq. foot to sq. yard:
1 square foot = .1111111111111 square yard.
You could convert foot to yard:
1 foot = .33333333333333 yard.
Yards are good, but "linear" yards are unnecessary.
Carpet and flooring manufacuters use the following formula:
Number of linear ft. times .731 then they round to the next higher yard.
So, 28 linear ft. tinmes 0.731 = 20.47 Sq. Yds. rounded up to the nearest yard is 21.
I just ordered some flooring and that's how they told me to convert it.