Quick answer: Divide total wall area by the usable coverage per roll (a standard roll covers ~25 sq ft after pattern matching) and round up. Add an extra roll for large pattern repeats.
Calculate wallpaper rolls accounting for pattern repeat, door and window deductions, and matching waste.
If you buy wallpaper with a solid color or a random texture, the math is simple. But if your wallpaper has a pattern (like a floral, geometric, or damask design), you must match the pattern from one strip to the next.
How it works: If your pattern repeats every 20 inches, you might have to cut off and throw away 15 inches of wallpaper at the top of every strip just to get the pattern to line up with the previous strip. Our calculator includes a "Pattern Repeat" field to automatically account for this hidden waste so you don't run short.
Wallpaper packaging is notoriously confusing. A "Single Roll" might say it covers 50 square feet, but it is almost always sold as a "Double Roll" (two single rolls wrapped together).
The wallpaper market has split into two distinct categories. Choosing the right one depends on your skill level and the room.
If you apply wallpaper directly to bare drywall, you will never get it off without destroying the drywall paper. The glue will bond permanently to the porous surface.
The Fix: You must apply a product called "Wallpaper Sizing" or a wallpaper primer (like Roman Pro 977) before hanging. This creates a slippery, non-porous barrier that allows the wallpaper to stick firmly, but peel off cleanly in full sheets when you are ready to redecorate.
Wallpaper projects vary wildly. Here is how to use our calculator for the most common scenarios.
Light "orange peel" texture is fine. Heavy knockdown or popcorn texture will show through the wallpaper and prevent it from sticking properly. You must skim-coat the walls with joint compound to smooth them out first.
Never wrap wallpaper around a corner. Measure the distance from the last full strip to the corner, cut the strip to that width plus 1/2 inch, and wrap it slightly. Start a new, plumb strip on the adjacent wall overlapping that 1/2 inch.
Use a sharp utility knife and a straight edge. For long cuts, use a wallpaper cutting guide or a long metal ruler. Change your knife blade frequently; a dull blade will tear the paper instead of cutting it cleanly.
Score the surface with a wallpaper scoring tool to create tiny holes. Spray the wall with a mixture of warm water and wallpaper stripper (or fabric softener). Let it soak for 15 minutes, then scrape it off with a wide putty knife.
No. Peel and stick wallpaper has adhesive pre-applied to the back. However, if the adhesive is weak, you can use a spray adhesive to boost the stick, but this will make it permanent and no longer "removable."
For a standard accent wall, expect to spend $150-400 on wallpaper rolls alone at typical retail prices ($25-60/roll). Removing old wallpaper before installing new paper typically adds $1-3 per square foot in labor if you're hiring it out, or just time and elbow grease if doing it yourself.
For a standard 20.5 in wide, 33 ft European roll. Wall width means the total perimeter you are papering.
| Wall width | Height | Strips | Drops per roll (no repeat) | Rolls (no repeat) | Rolls (12 in repeat) |
|---|---|---|---|---|---|
| 40 ft | 8 ft | 24 | 4 | 6 | 8 |
| 40 ft | 9 ft | 24 | 3 | 8 | 8 |
| 48 ft | 8 ft | 29 | 4 | 8 | 10 |
| 48 ft | 9 ft | 29 | 3 | 10 | 10 |
| 56 ft | 9 ft | 33 | 3 | 11 | 11 |
| 60 ft | 8 ft | 36 | 4 | 9 | 12 |
| 60 ft | 10 ft | 36 | 3 | 12 | 12 |
| 72 ft | 9 ft | 43 | 3 | 15 | 15 |
A pattern repeat costs you a whole drop per roll once it pushes the effective drop past a clean division of the roll length. Order all rolls in one batch so the dye lot matches.
Every constant this calculator uses and where it comes from, so you can check it rather than take our word for it.
Local codes amend the model IRC and adopt different cycles — your building department governs. Manufacturers revise yields; where your product's data sheet disagrees with a default here, use the product's number. See our full methodology.