Wallpaper Calculator
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 not sure 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 length, width, and height of the room. If your room has a different shape that 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 will type the number of doors in, 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 includes values such as the cost of one wallpaper roll, its length, width, and the paper repeat (measured vertically). All of these values can be found 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. This number is always rounded 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.