Wallpaper calculator
Enter the wall, the roll dimensions printed on the label, and the pattern repeat. WallVive counts full-height drops, shows how many fit per roll, rounds up to whole rolls, and reports the offcut left over — with every step of the arithmetic on screen.
Count full drops before you count rolls.
This method aligns each drop to the entered pattern repeat, adds editable extra drops, rounds to whole rolls, and keeps opening treatment explicit.
Check usable width and length, pattern repeat, match type, batch or run number, substrate preparation, adhesive, and installation directions on the exact product. Screen pattern and color are only references.
Method and sourcesHow the count is built
Rolls are counted in drops, not square feet.
Most wallpaper calculators divide wall area by the area printed on the roll band. That answer is optimistic, because a roll is only usable in whole vertical drops. Once the last full drop is cut, whatever length remains on that roll is an offcut — it cannot be stretched across the next drop.
The pattern repeat compounds it. Each drop must start at the same point in the design to match the drop beside it, so the cut length is rounded up to the next whole repeat above the wall height plus your trim allowance. On a large repeat that rounding can add a foot or more to every single drop.
Drop length
Wall height plus trim allowance, rounded up to the next whole pattern repeat.
Drops per roll
Roll length divided by the cut drop length, rounded down to a whole number.
Drops needed
Wall width divided by the usable roll width, rounded up, plus any extra drops you add.
Rolls to buy
Drops needed divided by drops per roll, rounded up to whole rolls from one batch.
What this calculator does not assume
It does not reduce your roll count for doors and windows, because a full drop is normally still hung and trimmed across an opening. It does not model half-drop, offset, reverse-hang, or mural layouts, which need a manual layout check. And it treats leftover length as a fragmented total across rolls, not as one reusable spare drop. Read the method behind these choices on the methodology page.
Material planning map
Compare the questions, not invented prices.
Actual cost and suitability depend on the wall, product system, local price, delivery, tools, preparation, and installation quote.
Paint
Calculate or plan
Coverage, coats, primer, container rounding
Verify
Product TDS/SDS and substrate
Open material pathWallpaper
Calculate or plan
Drops, repeat, trim, rolls, batch
Verify
Match type and wall preparation
Open material pathShiplap
Calculate or plan
Board dimensions, seams, cuts, finish
Verify
Studs, substrate, fire and moisture conditions
Open material pathWall panels
Calculate or plan
Panel orientation, pack size, openings, cuts
Verify
Manufacturer fixing and edge details
Open material pathWood slats
Calculate or plan
Slat width, gap, count, stock length
Verify
Straight layout and suitable fixings
Open material pathBrick or stone veneer
Calculate or plan
Product system, layout, weight, cuts
Verify
Substrate, adhesive and local requirements
Open material pathTile
Calculate or plan
Tile dimensions, layout, cuts, movement joints
Verify
Approved substrate and wet-area system
Open material pathWallpaper quantity questions
Answers about counting rolls. The roll label and its batch number still control the final order.