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home.wallpaper-roll-calculator Calculator
Calculates the number of wallpaper rolls needed from wall dimensions, pattern repeat length, and roll coverage, including a 10% waste allowance. Pattern matching is the biggest variable — a 64 cm repeat wastes almost a third of each roll.
Inputs
Room Perimeter M
Reference formula or conversion factor shown for context.
Wall Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Roll Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Roll Width M
Horizontal extent perpendicular to the length.
Doors Windows M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
rolls required
Reference formula or conversion factor shown for context.
wall area to cover (m²)
The computed two-dimensional surface area.
usable area per roll (m²)
The computed two-dimensional surface area.
raw rolls (no waste)
Sample size or count used in the calculation.
waste factor assumed
A dimensionless multiplier applied in the calculation.
double-check
A pass/fail verification against the applicable code, standard, or threshold.