Wallpaper Calculator
Estimate wallpaper rolls needed for a room, minus doors and windows.
Rolls needed
6 rolls
- Paperable wall area
- 269 sq ft
- Area with 15% waste
- 309.35 sq ft
How we calculate this
Paperable area = (wall length × wall height) − (doors × 21 sq ft) − (windows × 15 sq ft). Rolls needed = waste-adjusted area ÷ coverage per roll — a standard US double roll covers about 56 sq ft.
Example
Measuring tips
Measure the total perimeter of the room and the wall height. Wallpaper typically needs a higher waste allowance than paint — 15% is a safer default than paint's usual 10%, since every cut has to account for pattern matching at the seams.
Common mistakes
- Using too low a waste allowance for a large pattern repeat, which can leave you short a roll.
- Buying rolls from different dye lots, which can cause a visible color mismatch between rolls.
- Forgetting that doors and windows reduce the area — ordering for the full gross wall area instead.
Frequently asked questions
How much wallpaper do I need for a 12x12 room?
A 12x12 room with 8 ft walls has about 384 sq ft of gross wall area. After subtracting typical doors/windows and adding waste, expect roughly 8-9 standard double rolls.
Does pattern repeat affect how much wallpaper I need?
Yes — a larger pattern repeat means more trimming waste to match seams, so increase your waste allowance above the 15% default for bold, large-repeat patterns.
Related calculators
Estimates are provided for planning purposes. Actual material requirements may vary based on supplier specifications, compaction, site conditions, installation method, waste, and local code.