For most designs, we recommend measuring your wall (including windows and doors to ensure matching across the space) and calculating the square footage.
For design patterns, you will need 1 roll for 54 square feet, and for plain wallpapers, you can consider 1 roll for 56 square feet of space.
For areas with lots of windows and odd-shaped walls, wastage will increase and more material may be required. We suggest you call a professional installer measure your wall to guide you best.