A standard European roll covers about 28 ft² after trimming and matching.
Wallpaper Calculator
Enter your wall dimensions to find how many wallpaper rolls you need, accounting for pattern repeat and waste.
Project dimensions
Total wall length
Wall height
Waste %%
Updates automatically as you change measurements.
Estimated materials
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
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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