Calculate the number of wallpaper rolls needed for any room, accounting for pattern repeat.
A typical 4×4 m room with 2.4 m ceilings needs about 8-10 standard rolls depending on pattern repeat.
Pattern repeat is the distance between identical points in the wallpaper design. Larger repeats mean more waste per drop.
Always buy 1-2 extra rolls for mistakes and future repairs. The same batch may not be available later.
Measure the width of each wall and the floor-to-ceiling height, then add them for the total wall area. Note the pattern repeat too, as it affects how many usable drops you get from each roll.
Start from a plumb vertical line near a focal point or the largest wall, not a corner, as corners are rarely straight. Work away from the main window so any overlaps are less visible.
Calculate how much paint you need for walls, ceilings and trim based on room dimensions.
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