How to use
- Enter room dimensions, doors, windows, and roll size.
- Add pattern repeat if the wallpaper must match between drops.
- Use the rounded roll count before ordering and verify batch numbers.
Input guide
- Roll width is entered in inches and roll length in feet.
- Doors and windows use planning deductions.
- Pattern repeat is entered in inches and adds a planning allowance.
Common mistakes
- Ignoring pattern matching waste.
- Mixing single-roll and double-roll labeling.
- Buying different dye lots or batches.
Assumptions and limitations
- No exact drop layout, ceiling slope, stairwell, niche, or pattern optimization is included.
- Opening deductions are planning estimates.
- Verify roll labels and batch numbers before purchase.
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Formula
- Wall area = room perimeter x height minus openings.
- Roll coverage = roll width in feet x roll length in feet.
- Pattern repeat adds a planning waste allowance.
- Rolls needed = area with waste / roll coverage, rounded up.
Example
A 12 ft x 10 ft room with 8 ft walls has 352 sq ft before openings. With standard roll coverage and pattern waste, the roll count rounds up to whole rolls.
FAQ
Why does pattern repeat matter?
A repeated pattern may require extra length for matching between strips, so less of each roll is usable.
Does this handle double rolls?
Yes if you enter the actual roll width and total roll length printed on the label.