Convert Square Inches to Square Feet
1 square inch (in²) equals 0.006944444444 square feet (ft²).
1 in² = 0.006944444444 ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square inch to square foot converter to paste a column from Excel.
How to Convert Square Inch to Square Foot
- 1 in² = 0.006944444444 ft²
- 1 ft² = 144 in²
- Example: convert 15 in² to ft²: 15 in² = 15 × 0.006944444444 ft² = 0.1041666667 ft²
Formula
ft² = in² ÷ 144
Derivation from SI units:
- 1 in² = (0.0254 m)² = 6.4516 × 10⁻⁴ m² = 6.4516 cm²
- 1 ft² = (0.3048 m)² = 0.09290304 m²
- 1 in² = 0.00064516 m² ÷ 0.09290304 m² per ft² = 0.006944444444444 ft²
Both units are defined exactly, so the factor is exact. Square Inch definition: square inch; Square Foot definition: square foot.
Worked examples
- 144 in² is exactly 1 ft².
144 in² × 0.006944444444 = 1 ft² - A 24 × 24 in panel, 576 in², is 4 ft².
576 in² × 0.006944444444 = 4 ft²
Square Inch to Square Foot conversion table
| Square Inches (in²) | Square Feet (ft²) |
|---|---|
| 0.1 in² | 0.0006944444444 ft² |
| 0.25 in² | 0.001736111111 ft² |
| 0.5 in² | 0.003472222222 ft² |
| 1 in² | 0.006944444444 ft² |
| 2 in² | 0.01388888889 ft² |
| 4 in² | 0.02777777778 ft² |
| 5 in² | 0.03472222222 ft² |
| 5.94 in² | 0.04125 ft² |
| 7 in² | 0.04861111111 ft² |
| 10 in² | 0.06944444444 ft² |
| 12 in² | 0.08333333333 ft² |
| 25 in² | 0.1736111111 ft² |
| 50 in² | 0.3472222222 ft² |
| 100 in² | 0.6944444444 ft² |
| 144 in² | 1 ft² |
| 500 in² | 3.472222222 ft² |
| 1000 in² | 6.944444444 ft² |
Where it's used
Areas measured in inches are converted to square feet to calculate face velocity in ft/min from CFM.
Square Inch to other area units
| Conversion | 1 in² equals |
|---|---|
| square inch to square meter | 0.00064516 m² |
| square inch to square centimeter | 6.4516 cm² |
| square inch to square millimeter | 645.16 mm² |
| square inch to square foot | 0.006944444444 ft² |
Frequently asked questions
How do I convert in² to ft²?
Divide by 144.
How many square feet are in 1 square inch?
1 in² = 0.006944444444 ft².
How do I convert square inches to square feet?
Multiply the value in in² by 0.006944444444, or divide it by 144. For example, 15 in² × 0.006944444444 = 0.1041666667 ft².
Is the in² to ft² conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square inch (in²)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square foot (ft²)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Inches to Square Feet. Retrieved October 17, 2026, from https://scientificconverters.com/area/square-inches-to-square-feet/
IEEE
Scientific Converters, "Convert Square Inches to Square Feet," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/area/square-inches-to-square-feet/