Wallpaper Formula:
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Definition: This calculator estimates the number of wallpaper rolls needed based on the wall area and coverage per roll.
Purpose: It helps homeowners and interior designers determine how much wallpaper to purchase for a project.
The calculator uses the formula:
Where:
Explanation: The total wall area is divided by the coverage per roll, then rounded up to the nearest whole number since you can't buy partial rolls.
Details: Proper calculation prevents purchasing too much (wasting money) or too little (risking pattern mismatch between batches).
Tips: Enter the total wall area in square feet and the coverage per roll (default 30 sq ft). All values must be > 0.
Q1: How do I measure wall area?
A: Multiply wall height by width for each wall, then sum all areas. Subtract windows/doors if they cover > 10 sq ft.
Q2: What's typical roll coverage?
A: Standard rolls cover about 30 sq ft, but check manufacturer specs as this can vary (25-36 sq ft).
Q3: Should I add extra rolls?
A: Yes, add 10-15% extra for pattern matching, mistakes, and future repairs.
Q4: What about pattern repeat?
A: Complex patterns require more wallpaper - multiply result by 1.2-1.3 for large repeats.
Q5: How do I account for doors/windows?
A: Subtract only large openings (>10 sq ft each) from total area.