Wallpaper Calculator

Created by Bogna Szyk
Reviewed by Steven Wooding
Last updated: May 09, 2022

If you're wondering how much wallpaper do you need to cover the walls of your bedroom, this wallpaper calculator might be right up your alley. It will determine the number of wallpaper rolls that you need to buy. It takes into account multiple factors, such as the repeat of the pattern or custom wall openings.

If you're unsure whether you want to use wallpaper or paint, you can always check out our paint calculator.

How much wallpaper do I need?

Our wallpaper calculator requires you to input some data first. It includes the following values:

  • Room dimensions: you need to type in the room's length, width, and height. If your room has a different shape than a rectangular cuboid, you can also input the surface area directly. We recommend that you measure the height of your room anyhow if you want to include pattern repeat into the calculations.

  • Doors: you can leave the default dimensions of doors or customize them. Once you type in the number of doors, the wallpaper calculator will find their area automatically.

  • Windows: again, you can choose the default dimensions or type in custom ones. If you have windows of different sizes in your room, you can also calculate the total area manually and input this value into the appropriate box.

  • Wallpaper specifications: these include values such as the cost of one wallpaper roll, its length, width, and the paper repeat (measured vertically). You can find all of these values on the wallpaper packaging.

Once you type in all of these values, our wallpaper calculator will find the following for you:

  • Adjusted height: this is the actual length of wallpaper you will need to use per stripe to account for the pattern repeat.
  • Adjusted room area: takes into consideration both the pattern repeat and openings.
  • Number of rolls: the total number of wallpaper rolls you need to buy. The calculator always rounds this number up.
  • Total cost: the total amount of money you need to pay for your wallpaper.

How accurate is the result?

Even though the result is most accurate when it comes to the pattern repeat, you should add 10% of additional wallpaper to account for complicated fittings or for trimming. If the shape of your room is very complex, you should consult your decorator prior to the wallpaper purchase.

Bogna Szyk
Project type
Rectangular room
Room length
Room width
Room height
Room surface area
Number of doors
Door height
Door width
Total doors area
Number of windows
Window height
Window width
Total windows area
Roll length
Roll width
Pattern repeat
Cost per roll
Number of wallpaper rolls
Adjusted height
Adjusted room area
Number of rolls
Total cost
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