Wallpaper Rolls Formula:
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Definition: This calculator determines how many rolls of wallpaper are needed to cover a given wall area, using standard UK roll sizes.
Purpose: It helps homeowners and decorators estimate wallpaper requirements accurately to avoid shortages or excess purchases.
The calculator uses the formula:
Where:
Explanation: The total wall area is divided by the coverage per roll, then rounded up since you can't buy partial rolls.
Details: Proper calculation prevents project delays, ensures pattern matching consistency, and helps budget accurately for materials.
Tips: Enter the total wall area in m² and roll coverage (default 5.2 m² for standard UK rolls). All values must be > 0.
Q1: Why round up the number of rolls?
A: Wallpaper is sold in whole rolls, and you need extra for pattern matching and waste.
Q2: What's the standard UK roll coverage?
A: Typically 5.2 m² per roll (52cm wide × 10.05m long), but check your specific wallpaper as sizes vary.
Q3: Should I add extra for pattern matching?
A: Yes, for large patterns add 10-20% more. This calculator gives the base quantity only.
Q4: How do I calculate wall area?
A: Measure height × width for each wall, sum them, then subtract windows/doors (typically 1.5m² each).
Q5: What about different roll sizes?
A: Adjust the "Roll Coverage" field if using non-standard wallpaper (e.g., 7m² for extra-wide rolls).