How many square inches are in one square foot?

How many square inches are in one square foot?

• A. 100 sq in
• B. 144 sq in
• C. 120 sq in
• D. 144 in^2

Answer: (B)

One square foot is a square with 12-inch sides. Since area = length × width, you multiply 12 inches by 12 inches to get 144. So the area is 144 square inches, written as 144 sq in or 144 in^2. In roofing work, you’ll convert between feet and inches when you need precise inch-level measurements, so this conversion comes up often. The other numbers reflect 10×10 (100) or 10×12 (120) inches, which aren’t a full 1‑by‑1 foot area.

One square foot is a square with 12-inch sides. Since area = length × width, you multiply 12 inches by 12 inches to get 144. So the area is 144 square inches, written as 144 sq in or 144 in^2. In roofing work, you’ll convert between feet and inches when you need precise inch-level measurements, so this conversion comes up often. The other numbers reflect 10×10 (100) or 10×12 (120) inches, which aren’t a full 1‑by‑1 foot area.