Wallpaper Roll Calculator
Calculate how many wallpaper rolls you need for a room, accounting for doors, windows, and pattern repeats.
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How to use this calculator
Total wall area minus door (1.8 m² each) and window (1.2 m² each) deductions. Pattern repeats reduce usable roll area. Add 10% for waste and trimming.
- 1
Measure the length, width, and ceiling height of the room.
- 2
Count the number of doors and windows.
- 3
Enter the roll dimensions from the wallpaper packaging.
- 4
Enter the pattern repeat (0 for plain or non-matching wallpaper).
- 5
The calculator shows the minimum rolls needed and a buffered total.
Frequently asked questions
Why do I need extra rolls for pattern matching?
Patterned wallpaper must be aligned at the top of each strip, which means wasting the portion of paper between the ceiling line and the next pattern repeat. The larger the repeat, the more paper is wasted per strip and the more rolls you need.
Should I always buy extra rolls?
Yes — always buy at least 10% extra. Wallpaper dye lots vary slightly between production batches. If you run short later, you may not be able to match the original batch. Unused rolls can often be returned.
What is a standard wallpaper roll size?
In Australia and Europe, standard rolls are 52 cm × 10 m (0.52 × 10 m). In the US, double rolls (approximately 68–70 sq ft) are common. Always check the packaging for exact dimensions.
Wallpaper Roll Calculator — How Many Rolls Do I Need?
Calculating Wallpaper for a Full Room
Measure each wall and multiply by ceiling height to get total wall area. Subtract 1.8 m² for each door and 1.2 m² for each window. Divide the net area by the usable area per roll to get the number of rolls required.
The Impact of Pattern Repeat
A pattern repeat of 64 cm on a 2.4 m wall means you need to start each strip at a pattern boundary, wasting up to 63 cm of paper per strip. Large pattern repeats can increase your roll count by 20–30% compared with plain wallpaper.
Professional Tips for Wallpaper Hanging
Start from the most prominent wall and work around the room. Use a plumb line on every wall to ensure strips are vertical. Overlap seams by 2 mm and butt-join rather than overlapping. Paste the wall rather than the paper when using non-woven wallpaper for easier positioning.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →