Wallpaper Calculator
Calculate rolls of wallpaper needed based on room size, pattern repeat, and door/window deductions.
Results
How to Calculate Wallpaper
Measure wall perimeter times height for total wall area. Subtract 21 sq ft per door and 15 sq ft per window. Add waste for pattern matching. Divide by 35 sq ft per single roll.
Frequently Asked Questions
How many rolls of wallpaper do I need?
A standard American single roll covers about 35 sq ft usable after waste. Measure wall area, subtract windows/doors, add 15% for pattern matching, then divide by 35.
How much wallpaper waste for pattern repeats?
No repeat: 10% waste. Small repeat (0-6"): 15%. Medium repeat (7-12"): 20%. Large repeat (13-24"): 25%.