Work out how many strips and rolls of wallpaper you need for a room, accounting for doors, windows and roll size.
Enter your room and roll details and click Calculate to see rolls needed
This free wallpaper calculator estimates how many strips of wallpaper you need to go around a room, and how many rolls that translates to, based on your room's perimeter, wall height, door and window count, and roll dimensions. It's built for anyone planning a wallpapering project who wants to buy the right amount of material — in Feet or Meters — on the first trip to the store, instead of guessing and coming up short.
The calculator subtracts a standard opening width for each door and window from your total room perimeter to get the effective (paperable) perimeter, since you don't paper over doorways and windows. It divides that effective perimeter by the roll width to get the number of wall-height strips needed, and separately works out how many strips fit into one roll by dividing roll length by wall height. Dividing strips needed by strips per roll — and rounding up at each step — gives the final number of rolls to buy.
This tool is designed for homeowners planning a DIY wallpapering project, professional paperhangers preparing a materials list or job quote, and interior designers scoping a client's budget before ordering. It works equally well for a single accent wall or an entire room, and switches cleanly between Feet and Meters, so it suits both US-style and metric wallpaper rolls without manual unit conversion.
Wallpaper rolls are sold as whole units, and pattern repeats mean you typically can't split a roll perfectly across two different areas without waste. Knowing your strip and roll count up front — in either feet or meters — helps you avoid an awkward mid-project shortage, especially with discontinued patterns that may not be restockable.
The exact formula this wallpaper calculator uses to turn room measurements into a roll count
Door and window width allowances are standard averages, not manual entries: in Feet mode the calculator subtracts 3 ft per door and 2 ft per window; in Meters mode it subtracts 0.9 m per door and 0.6 m per window. Every division is rounded at each step (strips up, strips-per-roll down, rolls up) so the final number always errs on the side of enough material rather than too little.
Your room's total perimeter minus standard allowances for doors and windows, since those openings aren't papered.
Strips are individual wall-height cuts; rolls are the units you purchase. The calculator works out strips first, then converts to rolls.
Door width defaults to 3 ft (0.9 m); window width defaults to 2 ft (0.6 m) — typical average opening sizes.
From entering your room measurements to reading off the number of rolls to buy
Select Feet or Meters depending on how you measured your room. Switching units resets the fields to typical example values you can overwrite.
Add up all wall lengths at floor level for the perimeter, and measure from floor to ceiling for wall height — use the tallest point if your ceiling isn't level.
Count the doors and windows on the walls you're papering. The calculator deducts a standard width allowance for each one automatically.
Check your chosen wallpaper's label for its actual roll width and length, and enter them in the matching unit system — don't rely on generic defaults for your final order.
See the strips needed, strips per roll, and total rolls needed — all rounded up so you have enough material to finish the job.
A 14 × 10 ft bedroom with 9 ft ceilings, one door, and two windows
Suppose you're wallpapering a 14 ft × 10 ft room with 9 ft ceilings, one door, and two windows, using a standard US roll (1.75 ft wide × 33 ft long).
Explanation: This 14 × 10 ft room needs 8 standard US rolls to fully cover its walls, based on a plain (non-repeating) wallpaper. Because the calculator doesn't add pattern-repeat waste automatically, a patterned wallpaper with a large repeat could easily need 1-2 rolls more — see the reference table below for typical waste allowances by repeat size.
Quick metric check: The same style of room using metric defaults — 17 m perimeter, 2.7 m wall height, one door, two windows, and a 0.53 m × 10.05 m European roll — gives an effective perimeter of 17 − 0.9 − 1.2 = 14.9 m, 29 strips (14.9 ÷ 0.53, rounded up), 3 strips per roll (10.05 ÷ 2.7, rounded down), and 10 rolls needed (29 ÷ 3, rounded up).
What each number in your results panel actually means
| Result | What It Means | Example |
|---|---|---|
| Strips Needed | How many wall-height lengths of wallpaper are required to go around the effective (paperable) perimeter | 24 strips for a 41 ft effective perimeter at 1.75 ft roll width |
| Strips per Roll | How many strips can be cut from a single roll, based on roll length ÷ wall height, rounded down | 3 strips per roll from a 33 ft roll on a 9 ft wall |
| Rolls Needed | The total number of rolls to buy — strips needed ÷ strips per roll, rounded up to a whole roll | 8 rolls for 24 strips at 3 strips per roll |
| Effective Perimeter | The perimeter actually being papered, after subtracting standard door and window allowances (used internally to get Strips Needed) | 41 ft from a 48 ft perimeter with 1 door and 2 windows |
Why pattern-repeat waste matters: The rolls-needed figure assumes every strip is cut at exactly wall height, with no material lost matching a repeating pattern across seams. In practice, patterned wallpaper loses some length at the top of each new strip so the design lines up with the strip before it — the larger the pattern repeat, the more waste per strip, which is why buying a buffer roll or two beyond the calculated number is standard practice for anything but a plain or random-match design.
Reading the roll count: Treat "Rolls Needed" as a minimum shopping list, not an exact-use figure. Retailers generally can't take opened rolls back, so rounding up (which the calculator already does) and adding a pattern-match buffer is far cheaper than a second special order mid-project.
This calculator provides a material-quantity estimate only. Always confirm your room's actual measurements and your chosen wallpaper's exact roll dimensions and pattern repeat before placing a final order.
Where a fast, accurate roll estimate is genuinely useful
Get an accurate shopping list before starting a bedroom, living room, or dining room refresh.
Avoid an extra store run mid-project by estimating rolls correctly the first time.
Scope client material budgets quickly across multiple wallpaper options and rooms.
Calculate the small roll count needed for a single statement wall.
Plan playful pattern wallpaper for a nursery or children's bedroom.
Generate a fast materials estimate to include in a client quote or invoice.
Estimate rolls for retail, restaurant, office, or hospitality feature walls.
Budget a quick wallpaper refresh to make a listing more photo-ready.
Fold an accurate materials cost into a broader renovation or remodel budget.
Plan a fresh look for a home office or study without overordering.
Estimate materials for a turnover refresh between tenants.
Plan moisture-resistant wallpaper for smaller, oddly-shaped spaces.
Estimate rolls for tall or irregular walls by calculating each section separately.
Get a starting roll estimate before scaling up to a full mural or statement ceiling.
See how switching roll width or length changes the total rolls needed before you buy.
What this wallpaper calculator does well, and where it can't replace your own judgment
Typical roll dimensions to check against your own wallpaper's label
| Roll Type / Region | Typical Width | Typical Length | Approx. Coverage per Roll |
|---|---|---|---|
| US Standard | 20.5–21 in (1.7–1.75 ft) | 33 ft | ~56–58 sq ft |
| European Standard | 0.53 m | 10.05 m | ~5.3 m² |
| UK Standard | 52 cm (0.52 m) | 10 m | ~5.2 m² |
| Australian Standard | 53 cm (0.53 m) | 10 m | ~5.3 m² |
| Wide-Format / Designer | 27–36 in (0.69–0.91 m) | 24–30 ft (7.3–9.1 m) | Varies by brand |
| Peel-and-Stick | ~20.5 in (0.52 m) | Varies (often sold by sq ft) | Varies by brand |
These are typical figures, not guarantees — always confirm the exact width and length printed on your specific roll's label before entering it into the calculator, since sizes vary between brands even within the same region.
Summary: This wallpaper calculator gives you an instant, free estimate of strips and rolls needed for any room or wall, in Feet or Meters, based on your perimeter, wall height, doors, windows, and roll size — a solid shopping-list starting point that still leaves room for you to add a pattern-repeat buffer. Pair it with the Paint Calculator and Tile / Flooring Calculator for a fuller renovation materials estimate.
Common questions about estimating wallpaper quantities
Official guidance to complement this calculator — not a substitute for a professional decorator's site survey
Other home & project tools