Carpet Square-Yard and Linear-Foot Takeoff
Carpet in the units it is bought (square yards off a 12 ft roll), with higher waste for seam layout and pattern: gross = area x (1 + waste); SY = gross / 9; linear feet = gross / roll width. A 900 sf room at 10% waste is 110 SY, or 82.5 linear feet off a 12 ft roll; a 15 ft roll cuts it to 66 LF at the same 110 SY - a wider roll cuts the length and often the seams, not the yards. Distinct from the square-foot flooring-takeoff.
Formula and source
gross_sf = area_sf x (1 + waste_pct/100); carpet_sy = gross_sf / 9; linear_ft = gross_sf / roll_width_ft.
Carpet takeoff identity by name (gross area with waste, then square yards and roll length); first-principles unit conversion.
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