How to calculate wallpaper rolls
The basic calculation: total wall area ÷ usable area per roll = number of rolls. The tricky part is the pattern repeat — every drop must be cut so the pattern aligns, which wastes material. This calculator accounts for pattern repeat automatically.
What is a pattern repeat?
A pattern repeat is the vertical distance before a pattern starts again. A 300 mm repeat means every strip must be cut so the pattern aligns with the previous one — on average, you'll waste half the repeat length per drop. A plain or texture wallpaper has no repeat, so wastage is minimal (just the trim at top and bottom).
The pattern repeat is printed on the wallpaper label, often shown as a small symbol with a measurement.
Standard Australian roll sizes
Most wallpaper sold in Australia comes on 530 mm wide × 10 m long rolls — this is the standard to assume if the label doesn't specify. Some European and premium brands use 600 mm widths. Mural and grasscloth wallpapers often come in wider rolls (900–1000 mm) or are sold by the panel.
Feature wall vs full room
A feature wall (one statement wall) is a great entry point — you need far fewer rolls, and the impact is significant. For a standard 3.6 m wide wall at 2.4 m ceiling height, you'll typically need 4–5 rolls of a patterned paper or 3–4 of a plain.
Always buy one extra roll
Buy at least one roll more than calculated — ideally two for a patterned paper. Store the extras. If you need to repair a section years later, matching the same batch number is essential for colour consistency.