Bedroom Wallpaper Calculator
Estimate the wallpaper rolls a full bedroom needs, with pattern repeat and trim allowance.
Calculator
Free, runs entirely in your browser, and your numbers never leave your device. Results are estimates for planning only.
What this calculator does
Papering a whole bedroom means adding up every wall. This tool takes the combined width of all the walls, the height, and your roll's pattern repeat, then estimates the rolls — including the extra a patterned paper needs to keep the design aligned around the room.
How to use it
- Add up the width of all four walls and enter that combined figure.
- Enter the wall height and your roll's width, length, and pattern repeat.
- Use a 10–15% allowance, then read the total rolls for the room.
The formula
Drops = ⌈combined wall width ÷ roll width⌉. Cut length = ⌈wall height ÷ repeat⌉ × repeat. Rolls = ⌈drops ÷ (roll length ÷ cut length)⌉ × (1 + waste%).
Example calculation
A bedroom with 44 ft of combined wall, 9 ft high, 20.5-in × 33-ft rolls, 19-in repeat, 10% waste:
- Drops: ⌈44 ÷ 1.71⌉ = 26 strips
- Cut length: round 9 ft up to a whole 19-in repeat ≈ 10.6 ft
- Drops per roll: ⌊33 ÷ 10.6⌋ = 3
- Rolls: ⌈26 ÷ 3⌉ = 9, ×1.10 ≈ 10 rolls
Result: About 10 rolls — buy from one batch and keep a spare for repairs.
Buying and planning tips
- Subtract big openings only loosely — strips usually run full height past the door and window.
- Start papering at the most prominent wall and work toward a less visible corner where the pattern won't quite meet.
- Order all rolls together and confirm the batch number to avoid color shifts.
Common mistakes to avoid
- Adding only one wall's width instead of the whole room's perimeter of walls.
- Ignoring the pattern repeat, which underestimates a patterned room.
- Buying the bare minimum with nothing left for repairs.
Assumptions and limits
- Enter the combined width of every wall you are papering.
- Doors and windows are not deducted; the offcuts add a small safety margin.
- A 10–15% allowance covers trimming and matching the pattern around the room.
Frequently asked questions
How many rolls of wallpaper for a bedroom?
Add up all the wall widths, divide by the usable strips per roll, and add a trim allowance. A typical bedroom with a patterned paper needs around 9 to 11 rolls.
How do I measure all the walls?
Measure each wall's width and add them together for the combined width, then enter the wall height once. Skip large built-ins that won't be papered.
Where should the pattern not line up?
There is almost always one corner where the repeat won't meet perfectly. Plan that mismatch for the least visible corner, often above the door.
Do I subtract the door and windows?
Generally no. Strips run full height around openings and the offcuts are small, so leaving them in gives a useful margin.
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