Wallpaper Calculator – How Many Rolls Do I Need? | CalcLoft
Find out exactly how many double rolls of wallpaper you need, including pattern-match waste.
How to estimate wallpaper
Add the length of every wall you are covering to get the perimeter, then multiply by the wall height for the total area. A standard double roll is 20.5 inches wide and 33 feet long — about 56 sq ft, but after trimming and pattern matching you usually get 45–50 usable sq ft.
Patterns with a repeat waste more paper: the bigger the repeat, the more you cut off each strip. Our calculator handles this automatically — just pick your pattern repeat.
Pattern repeat and waste
| Pattern repeat | Usable area per double roll |
|---|---|
| None (random match) | ~55 sq ft |
| 8 in | ~48 sq ft |
| 12 in | ~44 sq ft |
| 24 in | ~38 sq ft |
Order extra!
Always order one extra roll. Wallpaper dye lots vary between batches, and you will need it for repairs or mistakes.
Related guides
Wallpaper calculator FAQ
How many rolls for a 12x12 room?
A 12 × 12 ft room with 8 ft walls has a 48 ft perimeter = 384 sq ft. With no pattern match you need about 7 double rolls; with a 12 in repeat, about 9 rolls. Use the calculator for your exact room.
What is a double roll?
A double roll is two shorter rolls packaged together (20.5 in × 33 ft total). Most wallpaper is sold this way. Our calculator counts double rolls.
Does the ceiling need wallpaper?
Usually not — this calculator estimates walls only. If you want a papered ceiling, add its area separately.
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