Step 1: Measure your walls height from celling to baseboard and choose the size that greater than or equal to your celling height. The remaining will be trimmed during installation. There is next height sizes available: 36", 48", 60", 72", 84", 96", 108", 120", 132", 144".
Step 2: Determine the number of panels to order. Measure the width of the wall you plan to install the wallpaper on.
Step 3: Divide the width by 24.
Step 4: Round that number up to the whole number.
Example: 149 inches wide ÷ 24 = 6.2
That would mean you need to order 7 panels.