Calculators

Bedroom Wallpaper Calculator: How Many Rolls Do You Need for a Bedroom?

A bedroom is the most commonly wallpapered room in the house, and it is also where calculation errors hurt most — a bedroom wallpaper job that runs out of paper mid-drop is difficult to fix if the batch number is no longer in stock. The calculation is straightforward when you approach it correctly: measure each wall, account for the door and windows, apply the pattern repeat, and add a safety margin for cutting waste. This guide walks through each step and explains when to use a bedroom wallpaper calculator instead of doing it by hand.

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Measure all four walls — width and height

Start with the room perimeter. Measure the width of each wall separately rather than relying on a single room-width figure, because bedroom walls are rarely all the same length — the alcove beside the chimney breast, the bay window recess, and the wardrobe wall can each have different widths. Record the ceiling height for each wall as well; in older properties the ceiling can slope slightly, so use the measurement at the tallest point. A standard double bedroom is typically 3.2–4.0 m wide per wall and 2.4–2.6 m high, but yours may differ.

Subtract doors and windows — but not all of them

A bedroom has one door and usually one or two windows. Subtract these from the total wall area, but be conservative: strips that are cut around a window are often partly wasted, so it is safer to treat a small window as a 30–40% area deduction rather than a full cut-out. For the door, subtract its full area from the wall it sits on. If you are papering just the bed-head wall (a common choice), you can ignore the door and window positions entirely and treat it as a single uninterrupted wall.

Add the pattern repeat to each drop

This is where most DIY calculations go wrong. If your wallpaper has a pattern repeat — the distance at which the pattern begins to repeat itself — each drop (vertical strip) must be cut longer than the ceiling height to allow for matching. The cut length per drop is ceiling height plus one full pattern repeat. On a 2.4 m ceiling with a 64 cm pattern repeat, each drop requires 3.04 m of paper. On a 10 m roll, that gives you three drops per roll instead of four. A large pattern repeat on a tall ceiling can double the number of rolls needed compared with a plain paper.

Count the drops per wall

Divide each wall's width by the usable strip width of the paper. Standard wallpaper rolls are 52–53 cm wide after trimming. A wall that is 3.5 m wide needs seven drops (3500 ÷ 520 = 6.7, rounded up to 7). Do this for each wall. Sum the drops across all four walls — or across the walls you are actually papering. Then multiply the number of drops by the cut length (ceiling height plus one pattern repeat) to get the total paper length you need. Divide by the roll length (usually 10 m) and round up to the nearest whole roll.

When to use a bedroom wallpaper calculator

The manual method works well for a simple rectangular bedroom with no unusual features. For a bedroom with a sloped ceiling under a loft conversion, a bay window that creates an irregular wall shape, or a chimney breast with alcoves, the manual approach becomes unreliable because each section has different dimensions. The Wallpaper Planner lets you add individual wall sections — you can enter the bed-head wall, the two side walls, and the window wall as separate measurements — and handles the pattern repeat and roll length calculations automatically. Enter just the walls you are actually papering if you are not doing the whole room.

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Common questions

How many rolls of wallpaper do I need for a bedroom?

A standard double bedroom of about 3.6 × 3.6 m with a 2.4 m ceiling typically needs 9–12 rolls for all four walls with a plain or small-repeat paper. With a large pattern repeat (above 60 cm), expect 12–16 rolls. For a single bed-head feature wall, 2–3 rolls is usually enough. Use the Wallpaper Planner with your exact measurements for an accurate count.

Do I need to subtract the door and windows from my wallpaper calculation?

Yes, but conservatively. Subtract the full area of the door. For windows, subtract 50–70% of the window area — strips that run alongside or above a window are often only partly usable, so a full deduction overstates the saving. For a bedroom with one door and one standard window, the net saving is usually 1–2 rolls compared with treating all walls as solid.

How does pattern repeat affect bedroom wallpaper quantity?

Pattern repeat adds to the cut length of every drop. On a 2.4 m ceiling, a plain paper allows four drops per 10 m roll. A paper with a 53 cm repeat allows three drops per roll. A paper with a 90 cm repeat allows only two drops per roll — effectively doubling the quantity needed versus plain paper for the same wall area. Always add the pattern repeat value to your ceiling height before calculating drops per roll.

More wallpaper guides

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

Ready to count rolls? Try the Bedroom calculator →

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

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Understand pattern repeat before you calculate. Wallpaper pattern repeat explained →

Calculate your exact roll count for your bedroom. Bedroom wallpaper calculator →