Planning a wallpaper project? Our Wallpaper Calculator helps you determine exactly how many rolls you'll need, saving you time and money. Simply enter your room dimensions, details about doors and windows, and wallpaper roll specifications to get an instant estimate. Avoid over-buying or running short!
Formula:
The calculator estimates wallpaper rolls using the following logic:
- Total Wall Area = 2 × (Room Length + Room Width) × Room Height
- Area of Openings = (Number of Doors × Door Area) + (Number of Windows × Window Area)
- Net Area to Cover = Total Wall Area - Area of Openings
- Wallpaper Area Per Roll = Roll Width × Roll Length
- Raw Rolls Needed = Net Area to Cover / Wallpaper Area Per Roll
- Final Rolls = Ceiling(Raw Rolls Needed × (1 + Waste Factor))
Where:
- Room Length (L), Room Width (W), Room Height (H): Dimensions of your room.
- Number of Doors (ND): Count of doors. (Assumed standard door area: 1.6 sq meters or 17.2 sq feet)
- Number of Windows (NW): Count of windows. (Assumed average window area: 1.44 sq meters or 15.5 sq feet)
- Roll Width (RW), Roll Length (RL): Dimensions of a single wallpaper roll.
- Waste Factor: An additional percentage (e.g., for pattern matching) to account for cuts and waste.