▥PROPERTY
Wallpaper Calculator
Estimate wallpaper rolls from wall area, openings, roll dimensions and a waste allowance.
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Formula
Net wall area = wall width × wall height − openings. Roll coverage = roll width × roll length. Rolls = net area ÷ roll coverage × (1 + waste%), rounded up.
Net wall area = wall width × wall height − openings. Roll coverage = roll width × roll length. Rolls = net area ÷ roll coverage × (1 + waste%), rounded up.
How it works
1
Enter the combined wall width and wall height.
2
Subtract large doors and windows if desired.
3
Enter the actual roll dimensions and your pattern/cutting allowance.
Important notes
Area-based estimates can undercount patterned wallpaper because strip layout and pattern repeats create additional waste. For complex patterns, use a larger allowance or a strip-based estimate.