Question: how many square feet is an average staircase?
Answer: As for each step this is 12" deep by 33.5" wide. Multiplying this will give you 2.79 square feet (since 33.5 inches equals 2.70 feet.) Multiply 2.79 square feet by 24 steps and you get a total of 66.96 square feet for the step portion of your stairs.