Convert between square inches and square feet in either direction.
How it works
Since 1 foot equals 12 inches, 1 sq ft = 144 sq in (12 squared). Enter a value in either field and the other updates instantly.
What this does not include
This is a plain area conversion. It doesn’t handle linear (single-dimension) conversions between inches and feet, which use a different, non-squared factor.
How to use this calculator
- Enter a value in square inches or square feet.
- The other field updates automatically.
Why is the area conversion factor squared compared to the length conversion?
Area scales with both dimensions of a shape at once, so when a linear unit conversion factor is 12 (inches per foot), the area conversion factor becomes 12² = 144, since both length and width are being converted.
When would I need to convert between these two area units?
Comparing a small material sample measured in square inches against a room or lot measured in square feet, like tile coverage or fabric yardage calculations, are common cases.
Is 144 exact?
Yes — since both units are defined within the same US customary measurement system with an exact 12-inch-per-foot relationship, 144 is an exact conversion factor with no rounding involved.
