How much waste should I add for wallpaper pattern repeat?

Use 10% for plain wallpaper and at least 15% for patterned wallpaper. Larger repeats need more because each strip must be cut to align the pattern.

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Wallpaper calculator — rolls

Estimate wallpaper rolls from wall area, door/window deductions, roll coverage, and pattern waste. Wallpaper is often priced as a single roll but sold as double rolls.

You'll need

8 single rolls

Wallpaper rolls

Net wall area: 364 sq ft

What this assumes

400 ft² minus 1 doors at 21 ft² and 1 windows at 15 ft².
10% waste is applied; patterned wallpaper uses at least 15%.
56 ft² per US single roll is the coverage setting.

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Coverage rates & sources

Every number this calculator uses is a published engineering constant — not an estimate we made up. Here is exactly what it assumes and where each value comes from.

US single-roll coverage: ~56 ft²/single rollSource: US standard single roll ≈ 20.5" × 33 ft ≈ 56 ft² (industry); a "double roll" = 2×
Plain wallpaper waste: 10%Source: Standard (solid/no-repeat)
Patterned waste: 15%+Source: Standard for pattern-repeat alignment (larger repeat -> more)
Door/window deductions: 21 / 15 ft²Source: Standard door/window planning areas (shared with paint calc)

Before you buy

Wallpaper is usually priced as a single roll but sold as a double roll; order in pairs and buy the same run/batch.
A large pattern repeat can push real waste well past 15%.
Keep an extra roll for repairs because dye lots vary between orders.

This is a planning estimate, not a substitute for a pro's on-site measurement. For load-bearing, structural, or code-regulated work, confirm quantities with a licensed contractor.

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