Wallpaper Calculator
Calculate how many wallpaper rolls you need for a room.
Frequently Asked Questions
How many rolls of wallpaper do I need?
Measure total wall perimeter × ceiling height = total wall area. Subtract doors (≈2m² each) and windows (≈1.5m² each). Divide by the usable coverage per roll (roll width × roll length, minus pattern repeat waste). Add 15% for trimming and matching. Standard UK roll (10m × 520mm) covers about 5 m² net.
What is a pattern repeat in wallpaper?
A pattern repeat is the vertical distance between where the design repeats. A straight match has the same pattern level across all strips — minimal waste. A drop match (half-drop or quarter-drop) means alternate strips start mid-pattern — wastes 25–50% more per roll. Always buy 1–2 extra rolls when using drop-match wallpaper.
How do I hang wallpaper around windows and doors?
Measure and cut strips to allow for the full repeat above and below window/door openings. The waste from cut-aways cannot be reused if the repeat doesn't align. This is why allowing extra rolls is important — the calculator adds a waste factor but for complex rooms with many openings, consider adding an additional roll.