Calculators

Bathroom Wallpaper Calculator: How Many Rolls for a Bathroom?

Bathrooms present a different calculation challenge from a bedroom or living room: the walls are small, but they are full of interruptions — a bath panel along one wall, a window above it, a shower enclosure, a door, a radiator, and sometimes a built-in storage unit. The result is that a bathroom often needs more rolls per square metre of actual wall surface than a larger room would, because each interruption creates off-cut waste. Getting the calculation right before you buy prevents running short in a small room where matching a new batch is particularly visible.

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Choose a moisture-resistant wallpaper first

Before calculating quantities, confirm that the paper you have chosen is appropriate for a bathroom. Standard paste-the-paper wallpapers are not suitable for rooms with sustained steam and condensation — they absorb moisture, soften the paste, and begin to peel at the seams within months. Vinyl-coated papers, non-woven papers with a moisture-resistant coating, or purpose-made bathroom papers are the right choices. Some bathroom installations also benefit from a breathable wallpaper adhesive rather than a standard fungicidal paste. Make this decision before measuring, because vinyl-coated papers typically have a narrower usable width (around 52 cm) compared with some textile-backed papers.

Measure each wall separately — bathrooms are irregular

Most bathrooms have at least one wall that is partly or fully occupied by a bath or shower enclosure, leaving only a narrow strip of wall above the bath panel. Measure this strip as its own section rather than including the full wall height — you are papering the wall above the tiled or panelled area, not from floor to ceiling. For an average bathroom with a bath along one wall, you might have: full wall height on the door wall and the opposite wall, and half-height (or less) on the bath wall and the window wall.

Account for the bath panel and shower enclosure as aftrekposten

Any surface that is tiled, panelled, or enclosed does not need wallpaper. Subtract the bath panel width from the wall it sits against when calculating the drop count for that wall. A standard bath is 170 cm long — if that wall is 200 cm wide, you only need wallpaper for the 30 cm of exposed wall beside or above the bath. On a shower-enclosure wall, the area behind glazed panels should similarly be excluded. These savings accumulate in a small bathroom and can reduce the roll count by one or two rolls.

Calculate drops and rolls as you would for any room

Once you have the dimensions of each wallpaper-able section, the calculation follows the same logic as any other room: divide the section width by the usable strip width (52 cm) to get the drop count, round up to a whole number, multiply by the cut length (ceiling height plus pattern repeat), sum across all sections, divide by the roll length (10 m), and round up to whole rolls. A small bathroom of 2 × 2 m with 2.2 m ceilings, one door, one window, and a bath along one wall typically needs 4–6 rolls of a plain or small-repeat paper.

Add extra for the waste bathroom cutting creates

Small rooms with many interruptions generate more off-cut waste per roll than large, uninterrupted walls. A strip cut around a window recess leaves a short off-cut that is too small to reuse elsewhere. A drop beside a door frame leaves a narrow off-cut. As a result, the safe margin for a bathroom is higher than for a bedroom — add at least one extra roll beyond the calculated count, or two extra if the pattern repeat is above 30 cm.

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Common questions

How many rolls of wallpaper do I need for a small bathroom?

A typical small bathroom of about 2 × 2.5 m with a 2.2 m ceiling, one door, one window, and a bath along one wall usually needs 4–6 rolls with a plain or small-repeat paper. The actual count depends on how much of each wall is taken up by the bath panel, shower enclosure, or tiling. Use the Wallpaper Planner — enter each paperable wall section separately for an accurate figure.

Can I use any wallpaper in a bathroom?

No. Standard paste-the-paper wallpapers absorb moisture and delaminate in bathrooms. Choose a vinyl-coated or non-woven washable paper rated for humid environments. Some manufacturers specify 'suitable for bathrooms' directly. Always use a fungicidal adhesive to prevent mould forming behind the paper.

Do I need to paper behind the bath?

No. The wall area behind a bath panel or a shower enclosure does not need wallpaper — it will not be visible and is exposed to water that would damage the paper quickly. Paper only the sections of wall that are exposed and above the tiled or panelled splash zone.

More wallpaper guides

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Get your exact roll count

Draw your walls — including sloped sections, alcoves, and single feature walls — and get a free estimate before you buy.

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Planning a specific room? See how much wallpaper you need →

Ready to count rolls? Try the Bathroom calculator →

Quoting this as a job, not a DIY project? Try the contractor estimator →

Bathroom wallpaper ideas and moisture-resistant choices. Bathroom wallpaper ideas →

How pattern repeat affects your roll count. Wallpaper pattern repeat explained →

Calculate rolls for your bathroom now. Bathroom wallpaper calculator →