Carpet & Flooring Calculator
Calculate square metres, rolls, and packs needed.
UKUK Building Regulations
References & Sources
Standards Cited
- BCTC Guidelines — British Carpet Technical Centre — Carpet Installation Guidelines
Industry guidelines for carpet fitting, including direction of lay, join placement, and wastage allowances for pattern matching
Formulas Used
- Room Area:
A = length x width
Source: Standard geometry - Carpet with Wastage:
Total = area x (1 + wastage% / 100)
Source: BCTC 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 UK carpet roll widths are 4m and 5m — Manufacturer industry standard (UK/Europe)
- 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 — BCTC installation guidelines
- Carpet is laid along the longest dimension to minimize joins — BCTC installation guidelines