Square Footage Calculator
Calculate square footage of rooms, floors and lots. Supports multiple areas, waste factor and metric conversion. Free.
Frequently asked questions
- What waste factor should I use?
- 10% for standard rectangular cuts, 15% for diagonal or herringbone patterns, 20% for rooms with many corners or awkward angles.
- How do I measure an L-shaped room?
- Split it into two rectangles, enter each as its own row, and the tool adds them together.
- Does it convert to metric?
- Yes — the total is also shown in square metres (1 sq ft = 0.092903 m²).
This tool runs entirely in your browser. No data is uploaded anywhere.