What is the Wallpaper Calculator?
Estimate wallpaper rolls needed for a room. Order the right amount the first time. These construction and DIY calculators estimate materials for common home projects and include sensible waste allowances.
How to use the Wallpaper Calculator
- Enter your room perimeter, your wall height, your usable coverage per roll, your doors & windows area.
- Results update automatically as you type; you can also press Calculate.
- Read the output: rolls needed, wall area.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With room perimeter = 48 ft, wall height = 8 ft, usable coverage per roll = 28 ft², doors & windows area = 40 ft², the Wallpaper Calculator returns rolls needed: 13; wall area: 344 ft².
Tips for better results
- Add 5–15% for waste, cuts and breakage depending on the material.
- Measure twice and round up when buying — returns are easier than second trips.
- Coverage figures vary by product, so check the label or spec sheet.
⚠️ Material estimates are approximate. Follow local building codes and manufacturer instructions.
Frequently asked questions
What does the Wallpaper Calculator do?
Estimate wallpaper rolls needed for a room.
How is it calculated?
The Wallpaper Calculator uses this method: Rolls = (Perimeter × Height − openings) ÷ usable roll coverage.
Can you show an example?
With room perimeter = 48 ft, wall height = 8 ft, usable coverage per roll = 28 ft², doors & windows area = 40 ft², the Wallpaper Calculator returns rolls needed: 13; wall area: 344 ft².
Is the Wallpaper Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. Material estimates are approximate. Follow local building codes and manufacturer instructions.
Is this tool free and private?
Yes — the Wallpaper Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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