There can be no conversion.
A foot is a measure of length in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempts at comparisons or conversions between the two are fundamentally flawed.
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A foot is a linear measurement which has no width. Therefore its area is 1 ft × 0 ft = 0 sq ft.
Feet are length units, square feet are area units. It is not possible to convert between the two.