Wallpaper Calculator
How many rolls to buy after repeat waste — quantity, not hanging labor. Click any i for detail.
Walls
Wall area (sq ft)
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Area
Height × width of walls, minus big windows if you want. |
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|---|---|
Usable sq ft / roll
i
Coverage
U.S. singles are often ~25–30 sq ft after trim; many Euro rolls ~50–56. |
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Pattern waste (%)
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Waste
Large repeats need more. 10–20% is a common band. |
How to use this calculator
- Measure wall area.
- Read usable coverage from the roll label (not the printed square feet if it ignores trim).
- Raise waste for a big pattern repeat.
- Round up — dye lots are hard to match later.
Results explained
Rolls = ceil( area × (1 + waste%) ÷ coverage ). Distinct from wallpaper *installation cost*.
Quick reference: rolls
Always match lot numbers. Buying one extra roll is cheaper than a mismatch.
| Item | Detail |
|---|---|
| U.S. single (typical usable) | ~30 sq ft |
| Euro roll (typical usable) | ~56 sq ft |
| Small geometric | Often ~10% waste |
| Large mural repeat | 20%+ waste |
Paste-the-wall vs paste-the-paper does not change roll count.
How the estimate is built
Rolls = (sq ft × (1 + waste%)) ÷ usable sq ft per roll, rounded up.
Example scenario
280 sq ft, 15% waste, 30 sq ft/roll → 322 / 30 ≈ 10.7, buy 11 rolls.
FAQ
Double rolls?
Enter the usable coverage of whatever unit you are buying.
Ceilings?
Add them to wall area.
Install price?
See wallpaper installation cost.