Square Foot (ft²)
The square foot (ft²) is the area of a square with 1 ft sides: exactly 0.09290304 m².
Symbol: ft² (ASCII: ft2)
Quantity: area
SI relation: 1 ft² = 0.09290304 m² (exact)
Derivation: 1 ft² = (0.3048 m)² = 0.09290304 m²
Exact: yes, by definition
Typical uses
- US floor and building areas
- Filter face area (a 24 × 24 in filter is 4 ft²)
- Fabric permeability in CFM per ft²
Convert square feet to other units
| Conversion | 1 ft² equals | Reverse |
|---|---|---|
| square foot to square meter | 0.09290304 m² | square meter to square foot |
| square foot to square centimeter | 929.0304 cm² | square centimeter to square foot |
| square foot to square inch | 144 in² | square inch to square foot |
| square foot to square millimeter | 92903.04 mm² | square millimeter to square foot |
Open the Area Converter to convert any value between all units.
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 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). Square Foot (ft²). Retrieved October 17, 2026, from https://scientificconverters.com/units/square-foot/
IEEE
Scientific Converters, "Square Foot (ft²)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/square-foot/