Inputs
Common: 520mm (UK), 530mm (EU), 700mm (wide).
Standard Euro roll: 10.05m.
Use 0 for plain / free match.
Typical: 10% (more for complex patterns).
Used to show net area and estimated spare area. Roll count is based on strip count.
Pattern repeats can increase the strip length needed. Always buy an extra roll for future repairs.
Results
Enter your room and roll details then click Calculate.
UKUK Building Regulations
References & Sources
Standards Cited
- Euro Roll Standard — Standard European Wallpaper Roll Dimensions
Defines the standard Euro roll as 0.52m (520mm) wide x 10.05m long, used as the default roll size - WIA Guidelines — Wallpaper Installers Association — Installation Guidelines
Industry guidance on pattern matching, wastage allowances, and strip calculation methods
Formulas Used
- Wall Area:
wallArea = roomPerimeter x wallHeight
Source: Standard geometry - Net Area:
netArea = wallArea - doorsWindowsArea
Source: WIA installation guidelines - Effective Strip Height (with pattern):
stripHeight = ceil(wallHeight / patternRepeat) x patternRepeat
Source: WIA installation guidelines — Each strip must start at a pattern repeat boundary for pattern matching - Strips per Roll:
stripsPerRoll = floor(rollLength / effectiveStripHeight)
Source: WIA installation guidelines - Total Strips:
totalStrips = ceil(roomPerimeter / rollWidth)
Source: WIA installation guidelines - Rolls with Wastage:
rolls = ceil(ceil(totalStrips / stripsPerRoll) x (1 + wastage% / 100))
Source: WIA installation guidelines
Key Assumptions
- Standard Euro roll dimensions: 0.52m wide x 10.05m long — European wallpaper industry standard
- Default 10% wastage for trimming and alignment — WIA installation guidelines
- Pattern repeat of 0 indicates a plain wallpaper with no matching required — WIA installation guidelines