You don't. If you multiply a feet measurement by another feet measurement then you get square feet. for instance if you have a rectangle that is 10 feet long and 5 feet wide and you want to calculate the area then you would use the equation area=Length x width
or area = 10 feet x 5 feet => 50 square feet.
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There are linear feet, and square feet, but no "linear square feet".
to calculate square feet you need a 2d shape
Square meters x 10.764 = square feet.
Square inches x 0.00694 = square feet
You can't actually go from feet to square feet because feet is distance but square feet is area. but to calculate for example the square feet in a rectangle you would do base times height.