How do I measure an irregular room?
Split it into rectangles and triangles, calculate each separately and add them. This is more accurate than averaging the longest and shortest walls.
Calculate square footage for rooms, homes, and properties. Supports rectangular, circular, and irregular shapes with instant results.
Rectangle = length × width. Triangle = base × height ÷ 2. Circle = π × radius². Total = sum of sections. Square yards = sq ft ÷ 9.
A 14 ft × 18 ft room is 252 sq ft, plus a 6 ft × 8 ft alcove (48 sq ft) makes 300 sq ft — about 33.3 square yards or 27.9 m².
Split it into rectangles and triangles, calculate each separately and add them. This is more accurate than averaging the longest and shortest walls.
Add 10% for straight-lay flooring and paint, and 15% for diagonal or patterned layouts and tile — offcuts around doorways are rarely reusable.
Divide by 10.764. A 300 sq ft room is 27.9 m². Note that square units do not convert with the linear factor.