How many rolls of wallpaper do I need?

Find the total wall area by multiplying the room perimeter by the wall height, then subtract about 21 square feet per door and 15 per window. Add 10 to 15 percent for pattern matching and trimming, then divide by the usable coverage of one roll and round up.

What is the difference between a single and double roll?

A double roll contains about twice the wallpaper of a single roll on one bolt, which means fewer seams and usually better value. Either way, enter the usable coverage printed on the packaging to get an accurate count.

How much extra wallpaper should I add for pattern repeat?

Add about 10 to 15 percent for a standard pattern, and up to 20 percent for large repeats, because each strip must be aligned to its neighbor and the offcuts are wasted.

Should I subtract doors and windows?

Yes, subtract large openings like doors and picture windows. Leaving small openings in simply adds to your safety margin.

Wallpaper Calculator — How Many Rolls Do I Need?

How to calculate wallpaper

Wallpaper is estimated by area, then adjusted for the waste created when matching patterns:

Rolls = (wall area − openings) × (1 + waste %) ÷ coverage per roll

Wall area is the room perimeter times the wall height: 2 × (length + width) × height. We subtract roughly 21 sq ft per door and 15 sq ft per window, add a pattern allowance, then divide by the usable coverage of a roll and round up.

Single vs. double rolls

Roll type	Typical usable coverage
Single roll	~25 sq ft
Double roll (one bolt)	~50–56 sq ft
Euro roll (10 m)	~28–30 sq ft

Always use the figure on your product's label — usable coverage is lower than the raw roll size once you account for trimming.

Wallpaper types

Peel-and-stick. Self-adhesive and removable — the easiest DIY option and great for renters, though large rooms get pricey.
Prepasted. The paste is pre-applied; you activate it with water before hanging.
Unpasted (traditional). You roll paste onto the paper (or the wall) — common on higher-end papers.
Non-woven. A breathable "paste-the-wall" backing that resists tearing and strips off dry later.
Vinyl. Washable and durable — best for kitchens, baths, and high-traffic walls.
Grasscloth. Natural fiber with a luxe texture; no pattern to match, but delicate and best left to experienced hangers.

Understanding pattern repeat

The pattern repeat is how often the design restarts down the roll, and it drives your waste. A random match (like many textures) needs little extra; a straight match lines up at the same height on each strip; and a drop match staggers the pattern, so neighboring strips start at different points and create more offcuts. The larger the repeat, the more you add — up to about 20%.

How much does wallpaper cost?

Wallpaper runs about $20–$80 per roll (roughly $1–$4 per sq ft), with designer prints, grasscloth, and murals costing more. Peel-and-stick is convenient but often costs more per square foot than traditional paper.

Tips

Mind the repeat. Large patterns waste more at each strip — add up to 20%.
Buy the same batch. Check that all rolls share a batch (lot) number so colors match.
Keep a spare roll. Useful for repairs and for papering a later accent wall.

How to hang wallpaper

Prep the walls. Clean off grease and dust, patch holes, and prime (or "size") the wall so the paper slides into place and strips off cleanly later.
Strike a plumb line. Don't trust the corner to be straight — mark a true vertical line and hang your first strip to it.
Paste. Paste the paper (or the wall, for non-woven), and "book" pasted strips for a few minutes so the glue activates evenly.
Hang and smooth. Align the pattern to the previous strip, then work bubbles out from the center with a smoother.
Trim and roll. Crease and trim the top and bottom with a sharp blade, roll the seams flat, and wipe off squeezed-out paste before it dries.

Frequently asked questions

How many rolls for a 12x12 room?

With 8 ft walls that's about 384 sq ft. After subtracting a door and window and adding 15% for pattern, you'll need roughly 16–17 single rolls (about 8 double rolls).

Single or double roll — which should I enter?

Either works; just enter that product's usable coverage. Double rolls mean fewer seams and often better value.

How much extra for pattern repeat?

10–15% for most patterns, up to 20% for large repeats that need more alignment.

Do I subtract doors and windows?

Subtract large openings. Leaving small ones in just pads your safety margin.

What's the easiest wallpaper to hang?

Peel-and-stick or paste-the-wall non-woven papers are the most forgiving for beginners and the easiest to reposition and remove.

What is pattern repeat?

It's how far down the roll the design restarts. A bigger repeat — especially a drop match — wastes more paper, so you add more to your order.

Can I wallpaper a bathroom?

Yes, with a washable vinyl or moisture-tolerant paper and good ventilation. Avoid delicate grasscloth in steamy rooms.

Do I need to prime the walls first?

Yes — a wallpaper primer or sizing helps the paper adhere, lets you slide it into position, and makes future removal far easier. Bare or freshly patched drywall especially needs it.

How do I remove old wallpaper?

Peel-and-stick and strippable papers pull off dry. Others come off by soaking with hot water and a wallpaper remover (or a steamer), then scraping — scoring the surface first helps the solution soak in.

How we calculate this

Wall area = perimeter × height, minus large openings

Usable coverage per roll is less than the roll’s total area because of trimming

Pattern repeat adds waste — the larger the repeat, the more you need

Sources: Standard wallpapering practice. Last reviewed: June 2026. See our methodology for how we build every estimate.