Convert Square Foot (ft²) to Square Inch (in²) instantly. Enter any value — result updates live.
Converting Square Foot to Square Inch is a common area conversion. One square foot (ft²) equals 144 square inch (in²). Square feet are the standard unit for real estate and floor area in the United States.
This conversion is commonly needed for gardening and landscaping, construction planning, farming and agriculture. Square inches measure small surfaces like screens, labels, and cross-sections.
To put square foot in perspective: a bath towel (about 6 ft²). In square inch, common references include a smartphone screen (about 15 in²).
US real estate listings almost universally use square feet, a holdover from imperial measurement that persists even though most of the world moved to square meters decades ago.
A screen's diagonal is given in inches, but its actual surface area is measured in square inches — a distinction that trips up a lot of screen-size comparisons.
People frequently convert between square foot and square inch for:
| Square Foot (ft²) | Square Inch (in²) |
|---|---|
| 1 ft² | 144 in² |
| 2 ft² | 288.1 in² |
| 5 ft² | 720.2 in² |
| 10 ft² | 1,440 in² |
| 15 ft² | 2,161 in² |
| 20 ft² | 2,881 in² |
| 25 ft² | 3,601 in² |
| 30 ft² | 4,321 in² |
| 50 ft² | 7,202 in² |
| 100 ft² | 14,000 in² |
| 200 ft² | 29,000 in² |
| 500 ft² | 72,000 in² |
| 1000 ft² | 140,000 in² |