Wallpaper Calculator
Enter the room's length, width and height, and the number of doors and windows, to see how many rolls to buy.
Your details
Result
Rolls needed
9 rolls
standard roll 10 m × 0.53 m · 10% waste
- Wall area
- 41.9 m²
- Large pattern repeats need extra. Buy all rolls from the same batch.
Good to know: This assumes a standard roll (10 m × 0.53 m). Large pattern repeats need extra.
Please note: Estimates only. Measure your actual space, buy a little extra, and check product labels, safety requirements and local building rules. Do not rely on this for structural or safety-critical work.
About this tool
Calculate how many wallpaper rolls you need based on room dimensions and roll size — for interior decorating.
Formula
Rolls = (room perimeter × wall height × waste factor) ÷ roll area. A 10% waste allowance is applied for standard rooms.
Reference values
- Standard roll: 52 cm × 10 m
- Pattern repeat adds 10-20% waste
- Always buy all rolls from the same batch
Questions people ask
How many rolls do I need for a room?
It depends on the wall area. A 4 m × 3 m room with 2.5 m walls usually needs about 7 standard rolls.
What is a pattern repeat?
The distance before the pattern repeats. Larger repeats waste more paper when matching.
Should I buy extra?
Yes. Keep a spare roll for repairs, and buy all rolls from the same batch.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators