Area formulas
Measurements are converted to feet first (1 in = 1/12 ft, 1 yd = 3 ft, 1 m = 3.28084 ft), so the result is always in square feet, with square meters and square yards alongside.
Example: a 12 ft × 10 ft room is 120 sq ft (11.15 m²). With 10% extra for waste at $4.50/sq ft, flooring would cost about $594.
Total a whole home from a floor plan
Upload a floor plan image, such as the one in a real estate listing. The calculator reads the room sizes printed on it, like Bedroom 12'6" x 11'0" or 3.8 x 4.2 m, lists every room, and adds them up. Each size stays editable, so you can fix anything misread. The image is read in your browser and never uploaded.
No sizes on the plan? Press Set scale, tap both ends of a wall you know the length of, then Trace a room by tapping its corners. The calculator measures the shape you traced, including L-shaped rooms.
Room sizes are measured inside the walls, and plans usually skip hallways, closets and stairs. That's why the room total is normally 10 to 20% less than the square footage a listing states.
Measuring irregular rooms
Split an L-shaped or irregular room into rectangles and triangles, calculate each one, and add them up. For flooring and tile, most installers recommend buying 5–10% extra for cuts and mistakes, and 15% or more for diagonal or herringbone patterns.
Next steps
Pouring a slab or painting the room? Take your area to the concrete calculator or the paint calculator.
Frequently asked questions
Can I get square footage from a floor plan picture?
Yes. Upload the image and the calculator reads the printed room sizes and totals them. If the plan has no sizes, set the scale from one known wall and trace each room.
How do I convert square feet to square meters?
Multiply square feet by 0.0929. For example, 120 sq ft × 0.0929 = 11.15 m².
How many square feet are in a square yard?
Nine. A square yard is 3 ft × 3 ft. Carpet is often priced per square yard, so divide square feet by 9.
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