A standard European roll covers about 28 ft² after trimming and matching.
MEASURE. ESTIMATE. BUILD.
Wallpaper Calculator
Enter your wall dimensions to find how many wallpaper rolls you need, accounting for pattern repeat and waste.
01 / PROJECT DIMENSIONS↙
Total wall length
Wall height
Waste %%
Change any measurement to update your estimate.
02 / YOUR MATERIAL ESTIMATE
You need approximately
14 rolls
covers 368 ft² (incl. waste)
- Area to cover
- 368 ft²
- Exact amount
- 13.14 rolls
Field notes
Buy every roll from the same batch (dye-lot) number — colors drift between print runs and a mismatched roll shows under raking light. A big pattern repeat is what drives waste up to 15–20%, because you trim each strip to align the design; a random or free-match paper wastes closer to 10%. Measure wall height plus the repeat length when you estimate, not just the wall.
How the wallpaper calculator works
The math behind the tool:
rolls = wall area ÷ usable roll coverage × (1 + waste%)Sources: Wallcoverings Association (roll sizes and pattern-repeat allowances).
Frequently asked questions
How many rolls of wallpaper do I need?
Multiply room perimeter by wall height for total area, divide by the usable coverage per roll (about 28 ft² for a standard roll), then add 15% for pattern matching and waste.
How does pattern repeat affect wallpaper?
A large pattern repeat wastes more paper at each strip because you trim to align the design; add 15–20% for big repeats versus about 10% for a random match.
How do you calculate wallpaper?
Multiply the total wall run by the wall height for square footage, add 15% for trimming and pattern matching, then divide by the usable coverage per roll — about 28 ft² once trim waste is accounted for. Buy every roll from one dye lot; colours drift between print runs.
How do you calculate square footage for wallpaper?
Wall run × wall height, wall by wall, then added together. Measure to the outside of door and window casings rather than deducting the openings — you need full-height strips either side of a window, and the cut-outs rarely yield a usable piece.
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