There’s no need to calculate the number of rolls you need with a wallpaper mural!  Simply measure the width and height of your wall, and order the wallpaper size that most closely fits your wall.  If the wall mural is larger, trim away the excess during installation.  If the wall mural is smaller, you can center it on the wall during installation.  You may also order your wallpaper mural in a custom size to fit your wall perfectly.