Calculate exactly how many rolls you need. Accounts for pattern repeat, waste factor, doors, and windows. Multiple rooms supported.
Optional. Enter your costs to see installer vs client totals and profit margin.
Used for door/window deductions. Adjust if your project has non-standard sizes.
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. Same engine the WallFlow dashboard uses.
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 × 33ft long (~56 sq ft). European rolls are typically 20.5″ × 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.
Calculator by WallFlow