Wallpaper calculator — how many rolls do you need?
The wallpaper calculator works out exactly how many rolls of wallpaper you need to cover your walls. Simply enter the total wall area to be papered, the room height, the roll width and length, and a waste allowance for pattern matching and cutting. The result gives you the number of rolls (rounded up) and the total wallpaper area in square metres.
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How we calculate the number of rolls
We divide the wall area by the roll width to get the number of strips needed. Each strip is as long as the room height. The total required wallpaper length is the number of strips multiplied by the height and the waste factor. We divide this total length by the roll length and round up to get the number of rolls.
Example calculation
Room with 40 m² wall area, height 2.5 m, roll 0.53 m × 10 m, 10% waste: strips = 40 / 0.53 ≈ 75.5, total length = 75.5 × 2.5 × 1.1 = 207.5 m, rolls = ceil(207.5 / 10) = 21 rolls. Total wallpaper area ≈ 110 m².
Frequently asked questions
How do I calculate how many wallpaper rolls I need for a room?
Calculate the total wall area (perimeter × height minus windows and doors), then divide by the roll width to get the number of strips. Multiply strips × height × (1 + waste%) and divide by the roll length, rounding up. Always add at least 10% for waste.
What is the standard width of a wallpaper roll?
The most common width in Europe is 0.53 m (53 cm). Other widths include 0.70 m (decorative), 1.00 m (structural) and 0.52 m (some vinyl rolls). Always check the exact dimensions on the packaging.
How long is a standard wallpaper roll?
A standard roll is 10 metres long, usually yielding 3–4 strips for a 2.5 m ceiling. Rolls from some brands may be 10.05 m, 15 m or 5 m. Always confirm the length on the label.
How much waste allowance should I add for wallpaper?
Add 10–15% for plain or small-pattern wallpaper, and 15–25% for large-pattern wallpaper (e.g. large floral or geometric). The allowance covers pattern matching, end cuts, first and last strips, and any accidental damage.
How do I measure the wall area for wallpapering?
Wall area = room perimeter × height minus windows and doors. Perimeter = (length + width) × 2. Example: room 4×5 m, height 2.5 m: perimeter = 18 m, wall area = 18 × 2.5 = 45 m². Subtract roughly 1.5 m² per window and 2 m² per door.
Which adhesive should I use for wallpaper?
Use lightweight wallpaper paste for paper wallpaper (about 60–80 g per 10 l water), heavy-duty paste for vinyl and non-woven (80–100 g per 10 l). Non-woven (fleece-backed) wallpaper is pasted directly to the wall; paper wallpaper must be soaked for 5–10 minutes.
How do I hang wallpaper correctly?
Prepare the wall (clean, smooth, prime), mark a vertical plumb line, start from a corner or window, apply paste to the wall (non-woven) or paper (traditional), smooth from centre outwards with a wallpaper brush or roller, and trim excess at ceiling and skirting.
How much does wallpapering a room cost in Poland?
Budget wallpaper: 20–60 PLN/roll; mid-range: 60–150 PLN/roll; premium: 150–500+ PLN/roll. Labour: 15–35 PLN/m². Example: 50 m² wall, 15 rolls at 80 PLN + adhesive 30 PLN + labour 50×25 PLN ≈ 2480 PLN. DIY saves about 50%.
How do I remove old wallpaper before redecorating?
Wet method: soak the wallpaper with warm water and washing-up liquid or a specialist remover, wait 10–15 minutes for the adhesive to soften, then strip with a scraper. Re-soak stubborn areas. After removal, wash the wall, repair any damage and prime before new wallpapering.
Is it better to wallpaper or paint walls?
Wallpaper offers more decorative options, hides wall imperfections and lasts 10–20 years, but costs more and is harder to apply. Painting is faster, cheaper and easier to change, but requires a smooth surface. Choose based on wall condition, budget and desired effect.
Results are indicative. We recommend buying 10–15% more wallpaper than the calculator suggests, especially for large-pattern wallpapers.