Construction & Materials
Wallpaper Calculator
Use the wallpaper calculator to plan rolls for feature walls or rooms when you know roll coverage.
Estimated quantity
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- Measured area
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- Area with waste
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- Estimated material cost
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
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Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the wallpaper calculator solves
Use the wallpaper calculator to plan rolls for feature walls or rooms when you know roll coverage.
Formula
How to use it
- Measure the project area in feet.
- Enter the coverage or yield printed on the material package.
- Add a waste percentage, then round the required units up.
How to read the answer
Pattern repeat can make usable coverage lower than the package's theoretical coverage.
Common mistakes and edge cases
- Match pattern repeats before cutting.
- Doors and windows may not save full roll coverage.
- Order enough from the same dye lot.
Worked examples
Feature wall
Estimated quantity
4 rolls
Tall wall
Estimated quantity
8 rolls
Frequently asked questions
Why does the calculator round material up?+
Most building materials are purchased in whole sheets, rolls, boxes, bags, gallons, bundles, or pieces, so partial units need to be rounded up.
Should I use the default waste percentage?+
The default is only a planning estimate. Increase it for diagonal layouts, complex rooms, fragile materials, or first-time installation.
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Last updated: May 15, 2026