Calculate exactly how many rolls you need. Accounts for pattern repeat, waste factor, doors, and windows. Multiple rooms supported.
Enter wall dimensions
Results appear automatically
Wall width ÷ roll width = strips needed. Calculated independently for each wall in each room.
Each panel cut rounds up to the next repeat. Fewer panels fit per roll = more rolls needed.
Panels ÷ panels-per-roll per wall, summed per room. More accurate than simple area ÷ coverage.
It depends on wall dimensions, roll size, and pattern repeat. Our calculator uses the panel method — counting exact strips needed per wall — which is more accurate than simply dividing area by roll coverage.
Yes! Click '+ Add Room' to add as many rooms as you need. Each room calculates independently, and you get a combined total at the top.
Pattern repeat is the vertical distance between identical points in the wallpaper design. A 25-inch repeat means each panel must be cut at multiples of 25 inches, creating waste. A higher repeat means fewer panels per roll and more rolls needed.
Standard practice is 10% for most installations. For complex rooms with many corners, angles, or obstacles, use 15%. For simple rectangular rooms with no pattern, you can use 5% or even 0%.
In the US, standard single rolls are 20.5" wide x 33ft long (~56 sq ft). European rolls are typically 20.5" x 27ft (~46 sq ft). Wide rolls are 27" wide and come in various lengths (15ft, 27ft, 30ft).
Yes. As long as you enter the correct roll width, length, and pattern repeat, the panel-based calculation works for all wallpaper types including grasscloth, vinyl, fabric, and murals.
Built by wallpaper installers, for wallpaper installers.
Try WallFlow Free