Wallpaper Calculator

Calculate how many rolls of wallpaper you need for any room. Accounts for doors, windows, roll size, and pattern repeat.

🎨 Wallpaper Calculator

Room Length (ft)

Room Width (ft)

Wall Height (ft)

Doors

Windows

Roll Width (in)

Roll Length (ft)

Pattern Repeat (in)

Results

Total Wall Area352.00 sq ft

Coverable Area301.00 sq ft

Coverage per Roll57.8 sq ft

Rolls Needed6 rolls

💡 How to Calculate Wallpaper Rolls

Standard American wallpaper rolls are 20.5 inches wide × 33 feet long, covering approximately 56 square feet per roll. Euro rolls are wider (21–27.5 inches) and shorter (33 feet is standard). Actual usable coverage is less due to trimming, pattern matching, and waste around openings.

Pattern repeat is the most overlooked factor in wallpaper calculations. A large pattern repeat (21+ inches) can waste up to 15% of each roll in matching. Straight-match patterns are more efficient than drop-match patterns. For patterned wallpaper, always buy 1–2 extra rolls from the same batch.

A 12×10 ft room with 8 ft ceilings, 1 door, 2 windows: perimeter = 44 ft, wall area = 352 sq ft, minus openings = 301 sq ft. At 56 sq ft usable/roll = 6 rolls needed (no pattern). With pattern repeat = 7 rolls.