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Construction Calculators

Wallpaper Calculator

Calculate how many rolls of wallpaper are needed to cover a room's walls, including a waste allowance.

ft
ft
ft
sq ft
A standard roll covers about 50 sq ft after trimming for pattern matching.
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Wall area —
Rolls needed —
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About the Wallpaper Calculator

This calculator estimates how many rolls of wallpaper you need to cover a room's walls. Because rolls are trimmed to match repeating patterns, only a portion of each roll's total length is usable — typically about 50 sq ft per standard roll.

Formula: Wall Area = 2 × (Length + Width) × Height; Rolls Needed = (Wall Area × (1 + Waste %)) ÷ Usable Coverage per Roll

Large pattern repeats waste more material, so increase the waste allowance to 15-20% for bold prints, and always buy rolls from the same dye lot.

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