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.
- 1Calculate room area = Length × Width
- 2Add 10–15% for wastage and pattern matching
- 3Consider carpet width: standard rolls are 3m, 3.66m, or 4m wide
- 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 width | Best for | Typical wastage |
|---|---|---|
| 3m (10ft) | Smaller rooms | 10–15% |
| 3.66m (12ft) | Most rooms | 8–12% |
| 4m (13ft) | Larger rooms | 8–12% |
| 5m (16ft) | Wide rooms | 6–10% |
References
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