How many rolls of wallpaper do I need for a 12 by 14 foot room?

The perimeter is 2 times (12 plus 14) which is 52 feet, and at an 8 foot ceiling that is 416 square feet of wall before openings. At a 27 inch roll width the wall run needs 24 strips. With a random match and a 4 inch trim allowance the cut length is 100 inches, a 27 foot roll gives 3 strips, and 24 strips is 8 rolls. With a 30 inch repeat the cut length becomes 120 inches, the roll gives only 2 strips, and the same room needs 12 rolls.

What is a wallpaper pattern repeat and why does it matter?

The repeat is the vertical distance before the pattern starts over, printed on the roll label. Every strip must start at the same point in the pattern as the strip beside it, so a strip is cut to the next whole repeat above the wall height rather than to the wall height. A 96 inch wall with a 4 inch trim allowance needs 100 inches of paper, but with a 30 inch repeat the cut length is 120 inches, so 20 inches is wasted on every strip and a 324 inch roll drops from 3 strips to 2.

How many strips of wallpaper do I get from one roll?

Roll length divided by cut length, rounded down. A 27 foot American roll is 324 inches, so at a 100 inch cut length you get 3 strips and waste 24 inches, and at a 120 inch cut length you get 2 strips and waste 84 inches. A double roll bolt of 54 feet at a 120 inch cut length gives 5 strips, while two separate 27 foot rolls give only 4, because the tail is only wasted once.

Should I subtract doors and windows when calculating wallpaper?

From the area yes, from the strip count mostly no. Paper hangs in full width strips, so the strip running past a window is still a whole strip off the roll, and with a pattern repeat the offcut rarely matches anywhere else. Subtract openings from the square footage as a cross-check but count strips across the full wall run. The exception is a genuinely large opening such as a wide patio door or an open archway.

What is a wallpaper dye lot or run number?

Wallpaper is printed in batches, and the batch is identified on the label as a run number, batch number or dye lot. Color can differ visibly between batches of the same paper, and side by side on a wall that reads as a stripe which cannot be fixed once the paste is dry. Order the whole job at once, ask the supplier to confirm every roll ships from one run, and check the labels before cutting.

How much extra wallpaper should I order?

Around 10 percent on top of the pattern repeat waste, which should be calculated separately. Go to 15 or 20 percent if the walls are out of plumb, if it is your first time hanging, or if a second order would be costly. Buying one whole spare roll from the same run is usually better than adding a percentage, because rolls are bought whole anyway and the spare becomes your repair stock.

Wallpaper Calculator | Rolls To Buy, With The Pattern Repeat

Q: What is the difference between straight match, half-drop match and random match wallpaper?

Random match, also called free match, has no horizontal alignment to hold, so there is no repeat rounding and it wastes the least. Grasscloth, vertical stripes and many plain textures are random. Straight match lines the pattern up at the same height on every strip, so each cut rounds up to the next whole repeat. Half-drop match offsets alternate strips by half the repeat, making the pattern run diagonally, so alternate strips need extra length.

Choose what you are papering

The Walls0 SQ FT

Room length

ft in

= 14.00 ft

Room width

ft in

= 12.00 ft

Ceiling height

ft in

= 8.00 ft

Measure floor to ceiling at the tallest point you will actually paper. If you are stopping at a picture rail or starting above a dado, measure that, not the whole wall.

Doors & windows to take out

Add A Custom Opening

Name

Opening width

ft in

Opening height

ft in

= 12.00 sq ft

Quick-add sizes are the common nominal figures, not a standard: a door at 3 ft by 6 ft 8 in and a window at 3 ft by 4 ft. Measure your own and use the custom form if they differ, because opening sizes vary a lot by house and by age.

What One Roll Gives You1:SCALE

Blue is wall you can cover. Orange is length the pattern repeat forces you to throw away. Gray is the tail at the end of the roll that is too short for another strip.

Rolls To BuyLIVE

Rolls to buy

0 rolls

Strips needed

Strips per roll

Cut length

Leftover strips

Extra waste allowance

Custom waste percentage %

This is on top of the pattern repeat waste, which is calculated separately and shown on its own line. It covers the things geometry cannot predict: a torn strip, a bad trim, an out of plumb wall that eats a strip, and the piece you ruin learning the paste.

The Pattern RepeatREAD THIS

This is the number that decides whether you run short

The repeat is printed on the roll label. It is the vertical distance before the pattern starts again. Every strip you cut has to begin at the same point in the pattern as the strip beside it, so a strip is not cut to the wall height, it is cut to the next whole repeat above the wall height. That rounding happens on every single strip, and it is why a roll that "covers 60 sq ft" can cover far less of your wall.

Pattern repeat

Match type

Trim allowance per strip (top plus bottom)

What each match type does

Random match, sometimes called a free match, has no horizontal alignment to hold. Grasscloth, vertical stripes, most plain textures and many small all-over textures are random. You still trim top and bottom, but there is no repeat rounding at all, so random match wastes the least of the three by a wide margin. If your paper is random, say so above and watch the roll count drop.

Straight match lines the pattern up at the same height on every strip. Each strip has to start at the same point in the repeat, so the cut length rounds up to the next whole repeat above wall height plus trim. A repeat of 3 in costs you almost nothing. A repeat of 24 in on an 8 ft wall can cost you an entire strip per roll.

Half-drop match, also called a drop match, offsets alternate strips by half the repeat, so the pattern runs diagonally across the wall. Alternate strips need extra length to reach their starting point, so this page adds half a repeat before rounding. Estimating methods for drop match genuinely differ between suppliers and hangers, some treating it the same as a straight match and some adding a full extra repeat. This page takes the middle position and you can override it by raising the trim allowance.

What the repeat costs you, at your wall height

Same room, same roll, straight match, only the repeat changing. The steps in this table are the whole point: the roll count does not creep up smoothly, it jumps the moment one more repeat stops fitting on the roll. The highlighted row is the repeat you entered.
Repeat	Cut length	Strips per roll	Rolls to buy	Wasted per strip

Your Roll#ROLL

Roll type

Roll width

Roll length

Sold as

These are typical figures, not standards. American papers are commonly around 27 in wide by 27 ft long and European papers around 20.5 in by 33 ft, but widths and lengths vary by manufacturer and by collection. The label on your roll is the authority. Read the width, the length and the repeat off it and type all three in here.

US wallpaper is very often priced as a single roll but shipped as a double roll bolt, which is two single rolls in one continuous length. That matters: a double roll usually yields more usable strips than two singles, because the cut length only has to divide into the tail once instead of twice. Switch the toggle to see it.

Yield & Waste#BUY

Order It All In One Batch#DYELOT

Every roll must come from the same run number

Wallpaper is printed in batches. The batch is identified on the label as a run number, batch number or dye lot, and the color between two batches of the same paper can be visibly different. Side by side on a wall the difference reads as a stripe, and there is no fixing it after the paste is dry.

This is the single most expensive mistake in wallpapering, and it is completely avoidable. Order the whole job at once, ask the supplier to confirm every roll ships from one run, and check the run numbers on the labels before you cut anything. If a substitute run arrives, send it back rather than hoping.

It is also the practical argument for buying one extra roll rather than ordering tight. Going back for a single roll two weeks later usually means a different run, and it means paying shipping twice. A spare roll from the right run is also the only sensible repair stock you will ever have for that wall.

If a job genuinely has to run across two batches, use the second batch on a separate wall, ideally around a corner or behind a door, so no seam ever puts the two runs next to each other.

Materials Ticket#PAPER

homeprojectresources.com wallpaper calculator

Enter the room size to build the ticket.

Take the ticket to the counter and ask for the ROLLS TO BUY figure all from one run number. Check the repeat on the label against the repeat on the ticket before you pay, because if they differ the roll count changes.

How This Is CalculatedSHOW WORK

The assumptions, stated

Wall area = perimeter multiplied by ceiling height. A 12 by 14 ft room has a perimeter of 2 x (12 + 14) = 52 ft, and at an 8 ft ceiling that is 416 sq ft of wall before you take anything out. That is the same figure the paint calculator gives for the same room, on purpose.

Openings are subtracted as their own line, never folded into the wall area, so you can always see both numbers. Note that the area figure is a cross-check, not what drives the roll count, for the reason below.

Strips are counted across the perimeter, not from the area. Strips needed is the total wall run in inches divided by the roll width, rounded up. Paper hangs in full-width strips whether or not there is a window in the middle of one, so area-based math consistently under-buys. The strip beside a window is still a whole strip off the roll, and with a pattern repeat its offcut usually cannot be reused anywhere else.

Cut length is the strip length you actually take off the roll. For a random match it is wall height plus your trim allowance. For a straight match it rounds up to the next whole repeat. For a half-drop match this page adds half a repeat first, then rounds up.

Strips per roll = roll length divided by cut length, rounded DOWN. This is the step other calculators skip. Whatever is left at the end of the roll is too short for another full strip, so it is waste. That is why the roll count jumps in steps rather than creeping up.

Rolls to buy = strips needed divided by strips per roll, rounded up, after the extra waste allowance is applied to the strip count. Leftover is the strips you paid for and do not use.

What this page does not do. It does not lay out where each seam lands, plan around a fireplace or a stair wall, allow for pattern matching around an outside corner, or count paste and lining paper. It assumes every strip runs full height from ceiling to baseboard. Very tall walls, a stairwell, or a paper hung horizontally all need a hanger's own take-off.

Wallpaper Quick ReferenceSCREENSHOT ME

Room size to wall area and strips

Wall area is perimeter x height, before openings are taken out. Strip counts are the wall run divided by a 27 in roll width, rounded up, and do not change with ceiling height. Highlighted row is the 12 x 14 ft room used in the worked example.
Room	Perimeter	Wall area at 8 ft	Wall area at 9 ft	Strips at 27 in wide
8 x 10 ft	36 ft	288 sq ft	324 sq ft	16
10 x 10 ft	40 ft	320 sq ft	360 sq ft	18
10 x 12 ft	44 ft	352 sq ft	396 sq ft	20
12 x 14 ft	52 ft	416 sq ft	468 sq ft	24
12 x 16 ft	56 ft	448 sq ft	504 sq ft	25
14 x 16 ft	60 ft	480 sq ft	540 sq ft	27
14 x 20 ft	68 ft	544 sq ft	612 sq ft	31
16 x 20 ft	72 ft	576 sq ft	648 sq ft	32

Typical roll sizes

Typical figures only. Widths and lengths vary by manufacturer and collection, and murals and peel-and-stick panels follow no convention at all. Always work from the label on the roll you are buying.
Roll	Width	Length	Area	Strips at 100 in cut
American single roll	27 in	27 ft	60.75 sq ft	3
American double roll bolt	27 in	54 ft	121.50 sq ft	6
European roll	20.5 in	33 ft	56.38 sq ft	3
European double length	20.5 in	66 ft	112.75 sq ft	7

Finish The Room

Wallpaper Calculator FAQ

How many rolls of wallpaper for a 12 by 14 foot room?

Start with the wall area: the perimeter is 2 x (12 + 14) = 52 ft, and at an 8 ft ceiling that is 416 sq ft before you take out doors and windows. At a 27 in roll width the wall run needs 24 strips.

The roll count then depends entirely on the repeat. With a random match and a 4 in trim allowance the cut length is 100 in, a 27 ft roll gives 3 strips, and 24 strips is 8 rolls. Put a 30 in repeat on the same paper and the cut length becomes 120 in, the same roll now gives only 2 strips, and you need 12 rolls for the identical room. Same wall, 50% more paper.

What is a pattern repeat and why does it matter so much?

The repeat is the vertical distance before the pattern starts over, and it is printed on the roll label. It matters because every strip has to start at the same point in the pattern as the strip next to it. You therefore cannot cut a strip to the wall height. You cut it to the next whole repeat above the wall height.

That rounding happens on every strip, and the loss is invisible until you count strips per roll. A 96 in wall with a 4 in trim allowance needs 100 in of paper. With a 30 in repeat the cut length is 120 in, so 20 in is thrown away on every single strip, and a 324 in roll drops from 3 strips to 2. This is the single biggest reason people run short, and almost no other calculator models it.

Straight match, half-drop match or random match?

Random match, also called free match, has no horizontal alignment to hold, so there is no repeat rounding at all and it wastes the least. Grasscloth, vertical stripes and many plain textures are random. Straight match lines the pattern up at the same height on every strip, so each cut rounds up to the next whole repeat. Half-drop match offsets alternate strips by half the repeat, which makes the pattern run diagonally and means alternate strips need extra length.

If you have a choice and you are papering a big room on a budget, a random match paper will genuinely cost you less, and it is far more forgiving to hang because a mistrimmed strip is not obvious.

How many strips do I get from a roll?

Roll length divided by cut length, rounded down. The rounding down is the whole game. A 27 ft American roll is 324 in. At a 100 in cut length that is 3.24, so you get 3 strips and 24 in is wasted at the end. At a 120 in cut length it is 2.7, so you get 2 strips and 84 in is wasted.

This is also why a double roll bolt is worth asking for. A 54 ft bolt at a 120 in cut length gives 5 strips, while two separate 27 ft rolls give only 2 each, so 4. Same paper, same price per single roll, one extra strip, because the tail only gets wasted once.

Should I subtract doors and windows?

From the area, yes. From the strip count, mostly no. Paper hangs in full width strips, so the strip that runs past a window is still a whole strip off the roll, and with a pattern repeat the piece you cut out of it almost never matches anywhere else. That is why this page subtracts openings from the square footage as a cross-check but counts strips across the full wall run.

The exception is a genuinely large opening: a wide patio door, an open archway, a run of built-in cabinets. If an opening is wider than two full strips and reaches close to the ceiling, take those strips off by hand. For a standard 3 ft door in an 8 ft wall, do not: you still need paper above it.

What is a dye lot or run number and why do all my rolls need the same one?

Wallpaper is printed in batches, and the batch is identified on the label as a run number, batch number or dye lot. The color between two batches of the same paper can be visibly different, and side by side on a wall that difference reads as a stripe you cannot fix once the paste is dry.

Order the whole job at once, ask the supplier to confirm every roll ships from one run, and check the numbers on the labels before you cut. It is also the best argument for buying one spare roll: going back later almost always means a different run, and that spare is your only repair stock.

How much extra should I order?

Around 10% on top of the repeat waste, which this page already calculates separately. Go to 15% or 20% if the walls are out of plumb, if it is your first time hanging, or if the paper is expensive enough that a second order would hurt. Keep the repeat waste and the extra allowance as separate lines so you can see which is which.

Buying one whole spare roll is usually the better move over adding a percentage, because rolls are bought whole anyway and a spare roll from the correct run is real repair stock. What you should never do is order exactly what the math says and plan to top up later.