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Wall area plus a pattern-matching waste allowance, divided by usable coverage per roll.
Wallpaper with a large pattern repeat wastes significantly more material than a random or small-repeat pattern, since each strip must align with the next — check your specific wallpaper's repeat size and bump up the waste factor for large repeats.
Wallpaper color can vary slightly between production runs (dye lots) — always buy all the rolls you'll need for a room at once, from the same lot, rather than risking a subtle color mismatch later.
Rolls needed
7
Pattern repeats can waste more material — bump the waste factor up for large or busy patterns.
What you entered
Add 15% for pattern matching waste
300 × 1.15= 345 sq ftDivide by usable coverage per roll (~50 sq ft)
345 ÷ 50= 7 rollsResult
Rolls needed: 7
300 sq ft of wall needs about 7 standard wallpaper rolls.