Wallpaper Calculator: How Many Rolls Do I Need?
Enter your wall width and height, choose your pattern repeat and roll size, and get an instant, brand-neutral estimate of how many rolls of wallpaper to buy. The calculator subtracts doors and windows and adds the right match waste — no sign-up, no guesswork.
Wallpaper Calculator
Enter the wall width and height, choose your pattern repeat and roll size, and the calculator tells you how many rolls of wallpaper to buy — for any brand.
How to use this wallpaper calculator
Enter the total wall width you're covering — for a whole room, add up the length of every wall; for an accent wall, just enter that wall's width. Add the height, the number of doors and windows, your pattern repeat, and your roll size. Press calculate for the number of rolls to buy, which the calculator always rounds up.
Single rolls vs. double rolls — the confusing part
Wallpaper is nearly always packaged as a double roll (one long bolt), yet the price is often listed per single roll. A double roll holds about twice the paper — roughly 56 sq ft versus 28. Because you get more continuous length, double rolls waste less paper when matching a pattern, so buy them whenever you have the choice. Pick the roll size you're actually purchasing and the calculator does the rest.
Pattern repeat and waste
The bigger the pattern, the more paper you trim to line up neighboring strips. A random or free match wastes about 10% for ordinary trimming. A small repeat (6 inches or less) adds around 18%, and a large repeat or drop match can reach 25–30%. The calculator builds this into your roll count, so the pattern you choose really does change how much you buy.
Measuring a whole room vs. an accent wall
For a whole room, measure along the floor and add the length of all four walls to get the total wall width. For a single accent wall, just measure that wall's width. Either way, multiply by the height to get the area — which the calculator handles once you enter the two numbers. Tall ceilings and stairwell walls use proportionally more.
Always buy the same batch (and one extra)
The most common wallpaper mistake is running short and buying a second batch that doesn't quite match. Note the batch / dye-lot number on the label and buy all your rolls from it at once. Add one spare roll — it costs little now and saves a whole-wall mismatch if you ever need a repair.
Frequently asked questions
How many rolls of wallpaper do I need for a 12×12 room?
A 12 ft × 12 ft room has 48 ft of wall and, at 8 ft high, about 384 sq ft. After subtracting a door and two windows and adding ~18% for a small pattern match, you need roughly 7 double rolls (about 56 sq ft each). Always round up and buy from one batch.
How much does a roll of wallpaper cover?
A standard American double roll covers about 56 square feet, a single roll about 28, and a European roll about 29. Because of trimming and pattern matching, usable coverage is a bit less — which is why the calculator adds a waste allowance on top of your wall area.
What is the difference between a single and a double roll?
Wallpaper is almost always sold and packaged as double rolls (one long bolt), even though prices are often quoted per single roll. A double roll holds about twice the paper of a single. Buy double rolls when you can — there is less wasted paper from matching the pattern.
How much extra should I add for pattern repeat?
A wallpaper with no repeat (a "random" or "free" match) wastes about 10% in trimming. A small repeat of 6 inches or less adds around 18%, and a large repeat or drop match can waste 25–30% because each strip must be aligned to the one beside it. The calculator adds this for you.
Should I subtract doors and windows?
Yes — the calculator removes the area of doors and windows so you don’t overbuy. It still keeps a healthy waste allowance, because you typically paper around openings rather than cutting perfectly to them.
Why should I buy all my wallpaper from the same batch?
Wallpaper is printed in batches, and the batch (or "dye lot") number is printed on the label. Rolls from different batches can vary slightly in color or pattern alignment. Buy everything at once from one batch, and keep a spare roll for future repairs.
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