If the concrete is planned for a stepped footing with the size 4' x 4' and 3' x 3' with a thickness of 8" for each step. Calculate the concrete quantity

• A. 12.00
• B. 16.57
• C. 20.00
• D. 24.50

Answer: (B)

Compute concrete volume by summing the volumes of each rectangular prism that makes up the steps. Convert thickness to feet: 8 inches = 8/12 = 0.6667 ft.

Bottom step: 4' × 4' with 0.6667 ft thick → 4 × 4 × 0.6667 = 10.6667 ft³.

Top step: 3' × 3' with 0.6667 ft thick → 3 × 3 × 0.6667 = 6.0000 ft³.

Total concrete = 10.6667 + 6.0000 ≈ 16.6667 ft³, which is about 16.57–16.67 ft³. The closest option is 16.57 ft³. If you need cubic yards, that’s 16.67 ÷ 27 ≈ 0.62 yd³.