Wallpaper Calculator
Calculate how many rolls of wallpaper you need based on room dimensions, pattern repeat, and openings like doors and windows.
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How It Works
A standard single roll of wallpaper covers about 28 sq ft of usable area after trimming. Pattern matching with larger repeats (21"+ ) wastes 10-15% more material because you must align the design across strips. Always round up and buy at least one extra roll — matching dye lots later is often impossible. For rooms with many windows or doors, you may need fewer rolls but still account for waste around each opening.