Wallpaper Calculator
Wallpaper is bought by the roll, so you need enough whole strips to cover the wall width, each long enough to clear the height plus one pattern repeat. Enter your measurements to get rolls and cost.
How to measure walls for wallpaper
Add up the width of every wall you are papering, and measure the floor-to-ceiling height. Do not subtract small doors and windows — the offcuts rarely reuse. For a quick area check, the square footage calculator totals odd-shaped walls.
Why the strip method beats area
Wallpaper is cut into full-height strips, and you can only take whole strips from a roll. Dividing wall area by roll area underestimates, because leftover lengths are wasted. This calculator counts whole strips per roll, which is how decorators actually order.
Pattern repeat and waste
With a patterned paper, each strip needs an extra pattern repeat in length so the design lines up. Enter the repeat from the roll label — a 0 repeat (free match) wastes the least, while a large repeat can cost you a strip per roll.
Frequently asked
How many rolls of wallpaper do I need?
Work out how many full-height strips fit across your wall, how many strips you can cut from one roll, then divide. The calculator does this for you and rounds up to whole rolls.
Why does the pattern repeat matter?
A patterned wallpaper must be matched between strips, so each drop wastes up to one full repeat in length. A larger repeat means fewer usable strips per roll and more rolls overall.
Should I round up on wallpaper?
Always. Buy one extra roll from the same batch number — dye lots vary between print runs, and you cannot match them later for repairs.