Things you may need
A quick list for the aisle. You may already own half of it.
- Wallpaper rolls
- Adhesive if needed
- Smoothing tool
- Seam roller
- Utility knife
- Level
- Sponge
- Drop cloth
Wallpaper Calculator
Estimate wallpaper rolls from wall length, wall height, openings, roll coverage, pattern waste, and price.
Before you buy Measure once more, check the product label, then use this as your shopping-list number.
Enter your project details
Use the defaults for a quick estimate, or adjust the advanced fields to match the product you plan to buy.
How the estimate works
The calculator uses your measurements plus ordinary unit conversions. Editable fields handle the parts that change by product: waste, coverage, bag yield, box coverage, or material density.
The buy recommendation rounds up because stores do not sell half gallons, partial boxes, or a fraction of a bag.
Beginner notes
- Pattern repeats can increase waste.
- Check the roll coverage on the product listing.
- Order from the same batch or dye lot when possible.
Planning estimate only
Actual material needs change with product, installation method, surface condition, layout, waste, and local requirements. For structural, permit, drainage, electrical, plumbing, or load-bearing work, get qualified local guidance.
Questions people usually ask
How much does one wallpaper roll cover?
Coverage varies. Many double rolls list around 56 square feet, but usable coverage can be lower after trimming and pattern matching.
Should I subtract windows and doors?
Subtract large openings for planning, but keep waste for trimming and matching.
Why add more waste for wallpaper?
Patterns, seams, mistakes, and trimming can eat material faster than plain wall area suggests.
Helpful next reads
Accuracy
How accurate are these calculators?
Where estimates work, where they fail, and when to check the product label instead.
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