How Many Rolls of Wallpaper for a 10x12 Room?

A 10 × 12 ft room with 8 ft ceilings takes nine double rolls. That figure assumes a 27 in × 27 ft roll, a straight match on a 21 in repeat, 10% waste, and no deduction for doors or windows. Change the roll or the repeat and it changes, which is what the rest of this page is about.

If you already have your measurements and your label, the calculator will do your room exactly rather than approximately.

Where nine comes from

A 10 × 12 room has four walls: two of 10 ft and two of 12 ft, a 44 ft perimeter.

1. Drops. 10 ft is 120 in ÷ 27 = 4.4, so 5 drops. 12 ft is 144 ÷ 27 = 5.3, so 6 drops. Two of each: 22 drops.
2. Cut length. 8 ft is 96 in, plus 4 in of trim is 100 in, rounded up to a whole 21 in repeat is 105 in.
3. Drops per roll. A 27 ft roll is 324 in ÷ 105 = 3.09, so 3 drops, with 9 in left over each time.
4. Waste. 22 × 1.10 = 24.2, so 25 drops.
5. Rolls. 25 ÷ 3 = 8.33, so 9 rolls.

Notice where the rounding happens: per wall at step 1, down at step 3, and up at step 5. Each one is a place where the honest answer is slightly more than the arithmetic suggests, and the area shortcut misses all three.

The chart

Every row: 8 ft ceilings, a 27 in × 27 ft double roll, 10% waste, no opening deductions. Three roll counts, for a plain paper, a 21 in straight match, and a 21 in half-drop.

Room	Perimeter	Wall area	Drops	Plain	21 in straight	21 in half-drop
6 × 8 ft (powder room)	28 ft	224 sq ft	14	6	6	8
8 × 8 ft	32 ft	256 sq ft	16	6	6	9
8 × 10 ft	36 ft	288 sq ft	18	7	7	10
10 × 10 ft	40 ft	320 sq ft	20	8	8	11
10 × 12 ft	44 ft	352 sq ft	22	9	9	13
12 × 12 ft	48 ft	384 sq ft	24	9	9	14
12 × 14 ft	52 ft	416 sq ft	26	10	10	15
14 × 16 ft	60 ft	480 sq ft	30	11	11	17

Two things in that table are worth pausing on.

Plain and straight match give the same answer. At an 8 ft wall, a 100 in cut and a 105 in cut both yield three drops from a 324 in roll. The repeat costs you nothing here. It would cost you a great deal at a 9 ft ceiling, where the cut goes from 112 in to 126 in and the roll drops from two drops to two, or on a larger repeat.

Half-drop costs roughly half as much again. The 115.5 in cut fits a 27 ft roll twice, not three times, so the same room needs 13 rolls instead of 9. If you are choosing between two papers and one is half-drop, that difference is worth pricing before you fall in love with it.

What moves the number

Ceiling height, more than floor area. The same 10 × 12 room at a 9 ft ceiling needs 13 rolls rather than 9. The drops do not change, but the cut length goes from 105 in to 126 in and a 27 ft roll drops from three drops to two. Height is the single most expensive variable in a wallpaper estimate.

The roll. Everything above assumes 27 in × 27 ft. A 20.5 in × 33 ft double roll is narrower, so the 10 × 12 room needs 28 drops instead of 22, and 11 rolls instead of 9. Narrow rolls cost more on the same wall.

The match type. Covered above. Half-drop is the expensive one.

Openings. The chart deducts nothing, which is the safer default on patterned paper. Deducting one door and one window from the 10 × 12 room takes it from 9 rolls to 8.

Room size is a starting point, not an order

A chart cannot know your ceiling height, your roll, your repeat, or whether your room has a chimney breast and two alcoves that turn four walls into eight. Those alcoves matter: drops round up per wall, so eight short walls need more paper than four long ones of the same total length.

Use the row above to sanity-check a quote or to budget before you have measured. Use the calculator to order from. For one feature wall rather than a whole room, the accent wall sheet is set up for a single wall, and for metric measurements there is the metric sheet.