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Estimate wallpaper rolls needed accounting for pattern repeat and openings.
A wallpaper calculator estimates the number of rolls needed for a room based on wall area, roll size, pattern repeat, and door/window openings.
| Type | Coverage |
|---|---|
| US Standard Single Roll | 28 sq ft |
| US Standard Double Roll | 56 sq ft |
| Euro Standard Roll | 57 sq ft |
| Wide Roll (Commercial) | 60 sq ft |
| Metric Roll | 54 sq ft |
Formula
Rolls = Net Wall Area ÷ Usable Coverage per RollNet Wall Area = perimeter × height − openings (sq ft)
Coverage per Roll = strips per roll × strip width × wall height
Worked Example
15 × 12 ft room, 8 ft walls, 1 door, 2 windows
Did you know? Wallpaper dates back to 1509, and the average roll of wallpaper covers about 28–30 usable square feet after accounting for trim waste (source: Wallcoverings Association).
Sources
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