Calculate square footage for rectangular, L-shaped, and irregular rooms with visual layout.
Most rooms are not rectangles. An L-shaped living room is two rectangles meeting at a notch, and an irregular room is rectangles and triangles in disguise, so any floor plan reduces to shapes whose areas add up. This tool does the reduction for you: you enter the wall-to-wall measurement of each part, it multiplies and sums the pieces, and draws the layout so every number stays attached to the part it came from. The usual mistake is skipping the decomposition: multiplying the room's overall length by its overall width, which counts the missing corner twice.
A concrete input and expected output from the current implementation.
Input
L-shaped room: main section 12 ft by 10 ft, leg 6 ft by 4 ft
Expected output
Total: 144 sq ft (main section 120 sq ft, leg 24 sq ft)
An L-shape splits at its notch into two rectangles, and the tool multiplies each pair of dimensions and adds the products: 12 x 10 = 120 and 6 x 4 = 24, so 120 + 24 = 144 sq ft.
Every calculation is length times width, applied piece by piece. A rectangular room is one product; an L-shape is split at its notch into two rectangles and the products are added; an irregular room is divided into rectangles and triangles, and a triangle's area is half its base times its height. The on-screen layout shows each piece, so a dimension you enter stays visually tied to the wall it describes.
The output is net floor area in square feet, computed from the dimensions you type. It is the area to cover, not the material to order: flooring installs typically add 5 to 10 percent for waste, cuts, and pattern matching. Walls that bow or corners that are not square make the true floor area differ from the arithmetic, and any dimension you leave out is simply not counted.
Split it at the notch into two rectangles and measure each one wall to wall. A 12 by 10 ft main section with a 6 by 4 ft leg is 120 plus 24, or 144 sq ft. Where the leg shares a wall with the main section, measure the real shared dimension rather than guessing, and keep every measurement in the same unit.
Only if you measure them. The tool totals exactly the shapes you enter, so include a closet when you are buying flooring that will cover it, and leave it out when a listing convention counts only finished, heated space. Decide what the number is for, then choose which parts to measure.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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