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.
Wallpaper calculator — frequently asked questions
How do I calculate how many rolls of wallpaper I need?
Measure the total width of the walls you're papering (in metres) and divide by the usable width of one wallpaper strip after trimming. Then divide your wall height by the pattern repeat to work out how many strips per roll. The calculator handles all of this — just enter your room dimensions, roll size and pattern repeat.
What is a pattern repeat and how does it affect how much wallpaper I need?
A pattern repeat is the vertical distance before the pattern starts again. For a 64 mm straight repeat, you need to add up to 64 mm of extra paper per strip to match the pattern at joins. Larger repeats waste more paper — a 600 mm repeat on a 2.7 m wall can waste 200–300 mm per strip. Always account for repeat when ordering.
What is a standard wallpaper roll size in Australia?
Most wallpaper sold in Australia comes in rolls 10 m long × 530 mm wide, giving about 5 m² of usable coverage per roll after waste. Some European and luxury brands use different dimensions — always check the roll specs on the label and use those figures in the calculator.
How much extra wallpaper should I order for waste?
The calculator already adds a 10% waste margin. For large pattern repeats (300 mm+), add an extra roll on top of the calculated amount. It's worth ordering one spare roll even on smaller jobs — dye lots change between print runs, and matching a repair years later can be very difficult if you run short.
Can I wallpaper over existing wallpaper in Australia?
Technically yes, but it's not recommended. Old wallpaper can trap moisture behind new paper, leading to mould and adhesion failures. The added weight can also cause both layers to peel away from the wall. Strip the old wallpaper first — it's more work upfront but gives a far better and longer-lasting result.