Wallpaper Calculator — fast
Calculate how many wallpaper rolls you need for a room.
Wall area
45.00 m²
Rolls needed
10 rolls
Perimeter
18.00 m
How to use Wallpaper Calculator
Enter Room Height
Locate the 'Room Height' input field at the top left. Type your wall height in feet or meters (select your preferred unit from the dropdown). Standard ceiling heights are 8-10 feet.
Input Wall Width
Find the 'Wall Width' input field below height. Enter the total width of all walls you're wallpapering. Add all four walls together, or enter individual walls and click 'Add Wall' button.
Select Wallpaper Pattern Repeat
Choose your pattern repeat from the 'Pattern Repeat' dropdown (0 inches, 6 inches, 12 inches, or 18 inches). Larger repeats require more material. Check your wallpaper packaging for this specification.
Set Roll Coverage Size
Select your wallpaper roll size from the preset options: US Standard (56 sq ft), European (57 sq ft), or Asian (27-30 sq ft). Most US wallpaper is 27 inches wide × 27 feet long = 56 sq ft.
Account for Windows and Doors
Toggle 'Deduct Openings' switch ON. Enter the number of standard windows and doors to subtract their square footage from your total wall area. Each standard window/door ≈ 20 sq ft.
View Your Results
The 'Rolls Needed' result displays in the green results box on the right. The calculator adds 10% waste buffer automatically. Round up to the nearest whole roll and add 1 extra for mistakes.