12×12 room · 8 ft walls
Input
21 in × 33 ft rolls · no repeatOutput
7 rolls (no buffer)28 strips × 8 ft = 224 linear ft ÷ 33 = 7 rolls.
Wallpaper roll count uses **strip layout math**: number of vertical strips around the room, strip height adjusted for pattern repeat, and total linear feet divided by roll length.
**Steps:**
1. Strips = ceil(perimeter ÷ roll width)
2. Strip height = wall height (or rounded up to pattern repeat)
3. Linear ft = strips × strip height
4. Rolls = ceil(linear ft ÷ roll length) × (1 + waste%)
**US double roll typical:** 21 in wide × 33 ft long.
**Pattern repeat:** Add repeat length to each strip so patterns align at seams — large repeats need more rolls.
Perimeter-based strip count with pattern-repeat strip height and roll length division.
Formula
strips = ceil(perimeter / roll_width); rolls = ceil(strips × strip_height / roll_length) × (1 + waste%)12×12 bedroom, accent wall, or total wall sq ft — on the main form.
Ceiling height in feet — strip length matches wall height plus pattern repeat.
Roll width (inches) and length (feet) — US double roll ≈ 21 in × 33 ft.
Inches from label — 0 for solid or random match.
Results show rolls to order, strip count, linear feet, and purchase guide.
Input
21 in × 33 ft rolls · no repeatOutput
7 rolls (no buffer)28 strips × 8 ft = 224 linear ft ÷ 33 = 7 rolls.
Input
Single wall · 8 ft heightOutput
2 rolls6 strips × 8 ft = 48 linear ft ÷ 33 = 2 rolls.
Input
Area modeOutput
3+ rollsArea ÷ (roll width × strip height) → strip count.
Input
9 ft wall heightOutput
Extra stripsStrip height rounds up to repeat — more linear ft.
Common real-world scenarios where this tool saves time.
Perimeter 48 ft, 8 ft walls, 21 in rolls — strip layout drives roll count.
Single wall mode — strips across wall width only.
Repeat adds strip height — order extra for pattern match.
Step-by-step chains that connect related tools for common tasks.
| Roll type | Typical size |
|---|---|
| US double roll | 21 in × 33 ft |
| US single roll | 21 in × 16.5 ft |
| Euro roll | 21 in × 33 ft (metric labels vary) |
Large repeats **increase strip height** — solid-wall math underestimates rolls.
Buy all rolls at once — batch numbers must match.
Wallpaper uses **wall area** or room perimeter × height — not floor area.
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With 8 ft walls, 21 in rolls, and 33 ft length: about 28 strips and 7 rolls before waste buffer. Add 10% for trimming.
US double rolls are twice the length of single rolls — always read your label length in feet.
US wallpaper often sells as double rolls (~21 in × 33 ft). Single rolls are half that length — check your label.
Each strip height rounds up to match repeat at seams — large repeats need longer strips and more rolls.
Standard US rolls are about 20.5–21 inches wide. European rolls may differ — enter width from label.
10% default for trimming; patterned papers may need 15% for match errors.
Use Single wall mode for accent walls; Full room for perimeter strip layout.
Yes — area mode estimates strips from total sq ft and wall height.
Roll math is the same — application method does not change strip count.
Compare Paint Calculator gallons vs wallpaper rolls — wallpaper adds pattern impact, paint is simpler DIY.
v1 uses gross perimeter — add waste buffer; manual adjustment for many openings.
Room dimensions stay on your device.
Estimates only — complex rooms with many openings may need professional measurement.
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Reviewed on 2026-06-27.
Strip height = wall height only
US double roll ≈ 21 in
Single roll ≈ 33 ft
0 for solid or random match — read from wallpaper label