Square Footage Calculator
Calculate the total square footage of a room, home, or lot, add multiple rectangular areas and get the sum instantly.
= 300 sq ft
Total area
300 sq ft
0.0069 acres • 33.3 sq yards • 27.9 m²
Frequently asked questions
How do I measure square footage?
Multiply length by width for each rectangular area, then add. Break odd shapes into rectangles.
Should I include closets and hallways?
For flooring, cleaning, and HVAC sizing, yes. For real estate listings, follow ANSI Z765.
How do I convert square feet to acres?
Divide by 43,560. One acre equals 43,560 sq ft.