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Wallpaper Calculator

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Rolls needed with pattern waste and openings deducted

Quick Answer

Wallpaper Calculator: Rolls needed with pattern waste and openings deducted. Wall area = perimeter × height = 2(L+W) × H.

m
m
m²

Roll spec

Pattern repeat

Rolls to buy
8 rolls
Strips needed23
Strips per roll3
Strip height265 cm
Net wall area39.0 m²

Calculation steps

  1. 1Strip height with pattern match: ceil(H ÷ repeat) × repeat = ceil(265 ÷ 0) × 0 = 265 cm
  2. 2Strips per roll: floor(10.05 ÷ 2.65) = 3
  3. 3Total strips: ceil(perimeter ÷ width) = ceil(16.4 ÷ 0.53) = 31; minus 8 for openings → 23
  4. 4Rolls: ceil(23 ÷ 3) = 8
Leftover ≈ 3.7 m² (cutting waste + matching). Buy one extra roll for large patterns or novice DIY — dye lots vary between batches, so buying all rolls at once is strongly recommended.

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How to Use

  1. Enter scenario values: fill real-life numbers into the Wallpaper Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Wallpaper Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Rolls needed with pattern waste and openings deducted.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Wallpaper roll estimate

Wall area = perimeter × height = 2(L+W) × H
Net area = wall area − doors & windows
Waste: plain 5%, small pattern 12%, large pattern 25%
Rolls = ⌈net area × (1+waste) ÷ area per roll⌉
Common rolls: 0.53m×10m (5.3㎡), 0.7m×10m (7㎡)

Example: 4m×5m room, 2.7m height, 4㎡ openings → 48.6㎡ walls, 44.6㎡ net, +12% waste → 49.95㎡ → 10 rolls of 5.3㎡.

FAQ

How do I use the Wallpaper Calculator?
Open the page and fill in the input fields — results update automatically. Rolls needed with pattern waste and openings deducted.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Wallpaper Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/wallpaper

Results provided by this tool are for reference only and do not constitute professional advice.