How many square feet equal 2.5 acres?

Answer 1

None, since there can be no conversion. A foot is a measure of length in 1-dimensional space while an acre 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 attempt at comparisons or conversions between the two are fundamentally flawed.

Answer 2

One acre has 43,560 square feet. Take 2.5 times that and you get 108,900 square feet.

Answer 3

108,900 square feet.