Carpet & Flooring Calculator
Calculate square metres, rolls, and packs needed.
NAIBC / IRC codes
References & Sources
Standards Cited
- CRI 104/105 — Carpet and Rug Institute — Installation Standards
Industry guidelines for carpet installation, including seam placement, stretch-in method, and wastage allowances
Formulas Used
- Room Area:
A = length x width
Source: Standard geometry - Carpet with Wastage:
Total = area x (1 + wastage% / 100)
Source: CRI installation guidelines — Default 10% wastage for patterned carpet; 5% for plain vinyl - Pieces Across Width:
pieces = ceil(roomWidth / rollWidth)
Source: Industry standard layout calculation — Used when the room dimension exceeds the roll width
Key Assumptions
- Standard US carpet roll widths are 12 ft (3.66m) and 15 ft (4.57m) — Manufacturer industry standard (USA)
- Default 10% wastage for carpet (pattern matching and cuts); 5% for plain vinyl — CRI installation guidelines
- Carpet is laid along the longest dimension to minimize seams — CRI installation guidelines