Wallpaper Calculator
Determine the number of standard wallpaper rolls needed based on room perimeter, wall height, trim allowance, and pattern repeats to avoid under-buying.
Complete Guide: Wallpaper Calculator
Everything you need to know about using this tool effectively
This calculator estimates how many wallpaper rolls you need to cover the walls of a room after subtracting doors and windows. It accounts for the pattern repeat length, which affects how much usable material each roll provides. Interior designers and DIY homeowners use it to avoid ordering too little or too much wallpaper.
A room measurement tool that calculates total wall area, subtracts openings like doors and windows, and divides by the effective coverage per roll to get the number of rolls required. The effective coverage adjusts downward when the wallpaper has a pattern repeat, since some material is lost aligning the pattern between strips. You enter the room perimeter, wall height, opening dimensions, roll size, and pattern repeat to get a precise count.
Bedroom makeover
Calculate rolls needed for an accent wall or full room coverage to order the right quantity for your design project.
Living room renovation
Estimate material for a large feature wall with multiple windows and doors that reduce the total coverage area.
Commercial interiors
Designers plan wallpaper quantities for offices, restaurants, and retail spaces with multiple rooms.
Rental property updates
Figure out material costs for refreshing rental units with wallpaper before listing them.
Comparing wallpaper options
Calculate roll counts for different wallpaper patterns and sizes to compare total project costs.
Measure the room
Measure the total perimeter of the walls you want to cover and the wall height from floor to ceiling.
Measure openings
Measure the height and width of each door and window that will not be papered.
Enter roll specifications
Type the wallpaper roll length, width, and pattern repeat distance from the product label.
Calculate rolls needed
Press calculate to see the total rolls required including the recommended spare quantity.
Order your wallpaper
Use the roll count to place your order, keeping in mind that you should buy from the same dye lot.
Always buy wallpaper from the same production batch or dye lot to avoid subtle color differences between rolls.
Add at least one extra roll to your order to cover matching mistakes, cutting waste, and future repairs.
Patterns with large repeats waste more material, so accurately measure the repeat distance printed on the roll label.
For rooms with sloped ceilings or alcoves, measure each wall section separately and add the areas together.
What is a pattern repeat?
The pattern repeat is the vertical distance before the wallpaper design starts repeating. A larger repeat means more material is wasted aligning the pattern between adjacent strips, which reduces the effective coverage per roll.
How do I measure the pattern repeat?
Look at the wallpaper label or product description for the repeat measurement in inches or centimeters. It is the distance from one point in the pattern to where that same point appears again vertically.
Should I include the ceiling in the wall area?
Wallpaper is typically applied to walls, not ceilings. If you plan to paper the ceiling, measure it separately and add that area to your calculation.
What if my room has an unusual shape?
Break the room into straight wall sections, measure each section individually, and add the perimeters together. This gives a more accurate total than trying to measure an irregular outline as one figure.
How many spare rolls should I order?
Ordering one extra roll is a good minimum. For rooms with many windows and doors or complex patterns, consider two extra rolls to be safe. Leftover wallpaper is useful for future repairs.