I present you the most detailed wallpaper calculator, which displays not only the amount of wallpaper you need, but will also give you a visual layout of wallpaper strips as a plan, uichting not only matching patterns, but also the overlap of panels for double cutting. Also, I always recommend taking a stock of wallpaper of about 10-15%.

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Here are some tips for working with the calculator:
1. All dimensions are in inches.
2. Often regular windows and doors are not included in the calculations, but if you have a Closet door or Patio, you can include them in the calculation. In any other case just delete the lines by clicking the cross.