Last updated: June 1, 2026

Wallpaper Calculator

Calculate the number of wallpaper rolls needed for your room, accounting for doors and windows.

Room Length (ft)

Room Width (ft)

Wall Height (ft)

Doors

Windows

728 × 90 Leaderboard

320 × 100 Mobile Banner

336 × 280 Large Rectangle

300 × 250 Medium Rectangle

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The calculator includes 15% waste for pattern matching and trimming. Buy an extra roll for future repairs.

US standard rolls are typically 20.5 inches wide by 33 feet long, covering about 56 sq ft.