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Carpet Calculator

Area and cost of carpet for any room layout

Carpet Calculator

Room Length (m)
Room Width (m)
Waste/Cuts (%)
Price per m² ($)

A carpet calculator determines how much carpet is needed for a room, including an allowance for wastage from cuts and seams. Carpet is typically sold by the linear metre in widths of 3m, 3.66m, or 4m.

  1. 1Calculate room area = Length × Width
  2. 2Add 10–15% for wastage and pattern matching
  3. 3Consider carpet width: standard rolls are 3m, 3.66m, or 4m wide
  4. 4Irregular rooms: divide into rectangles, sum areas, add wastage
Room 4m × 3.5m, no pattern=Area = 14m²; with 10% wastage = 15.4m²; one strip from 4m wide roll works
Carpet widthBest forTypical wastage
3m (10ft)Smaller rooms10–15%
3.66m (12ft)Most rooms8–12%
4m (13ft)Larger rooms8–12%
5m (16ft)Wide rooms6–10%
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