Square Inches to Square Feet Calculator
Convert between square inches and square feet. 1 sq ft = 144 sq in (because 12 in × 12 in = 144 sq in). Common for tile, fabric, and small-area projects.
Inches ⇌ Feet Converter
The conversion math
1 ft = 12 in. So 1 sq ft = 12 × 12 = 144 sq in. To convert sq in → sq ft, divide by 144. To convert sq ft → sq in, multiply by 144.
For dimensions in inches: convert inches to feet (divide by 12) BEFORE multiplying. A 30 in × 24 in tile = 2.5 ft × 2 ft = 5 sq ft, NOT 720 sq ft (which would be 30 × 24).
When to work in inches
Tile dimensions are usually given in inches (12×12, 18×18, 24×24). Convert each dimension to feet, then multiply for square footage per tile.
Fabric, paper, and small-format projects often use inches throughout. For these, calculate in square inches first, then divide by 144 only at the very end.
Pro tips
Consistent units always
Don't mix feet and inches in the same multiplication. Convert everything to one unit (usually feet) before calculating.
Use feet+inches input
The calculator above has a feet+inches input field that handles the conversion automatically. 12 ft 6 in becomes 12.5 ft.
Tile counts come from sq ft
Tile is sold by the box (covering X sq ft). Calculate your floor in sq ft, divide by sq ft per box, round up. Don't calculate in sq in - boxes are listed in sq ft.
Decimal feet for accuracy
1 inch = 0.0833 feet. 6 inches = 0.5 ft. 9 inches = 0.75 ft. Memorize these or use the feet+inches input field.