Square Inches to Square Feet Calculator
Convert square inches (sq in) to square feet (sq ft) with the exact factor 1 sq ft = 144 sq in.
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sq in
sq ft
Conversion Formula
Conversion factors follow NIST Special Publication 811 (US National Institute of Standards and Technology).
1 square foot = 144 square inches — so divide sq in by 144.
Example: 2,880 sq in ÷ 144 = 20 sq ft.
Quick Reference Table
| Square Inches | Square Feet |
|---|---|
| 144 sq in | 1 sq ft |
| 432 sq in | 3 sq ft |
| 720 sq in | 5 sq ft |
| 1,440 sq in | 10 sq ft |
| 2,880 sq in | 20 sq ft |
| 4,320 sq in | 30 sq ft |
| 7,200 sq in | 50 sq ft |
| 14,400 sq in | 100 sq ft |
| 28,800 sq in | 200 sq ft |
| 43,200 sq in | 300 sq ft |
Context & Use Cases
- Tile and backsplash work where dimensions are measured in inches.
- Duct, countertop, and signage surfaces priced per square foot.
- Converting product specs (e.g., a 24 in × 36 in sheet = 864 sq in = 6 sq ft).
FAQ
How many square feet is 1,440 square inches?
10 sq ft. Divide square inches by 144 because a square foot is 12 in × 12 in.
How do I convert a 24 × 36 inch sheet to sq ft?
Multiply 24 × 36 = 864 sq in, then divide by 144 = 6 sq ft.
Is there a shortcut for mental math?
Round 144 to 150: divide by 150, then add about 4% to the result. 1,500 sq in ≈ 10 sq ft (exact: 10.42).