Wallpaper planning

Estimate wallpaper drops and rolls

Copy the roll size and pattern repeat from the label, add up to four walls, and see how many drops and rolls you need, with trimming and pattern matching included.

Your rolls and walls

Pick an example or copy the roll details from the label. Each wall becomes full drops, with trim and pattern repeat added, before we count the rolls.

1. Choose units

2. Copy the roll details

Roll width (mm)Roll length (mm)Combined trim allowance per drop (mm)Pattern repeat (mm)

Pattern match from the product label No match or random matchNo repeat is needed across adjacent drops. Straight matchAdjacent drops begin at the same point in the pattern. Half-drop matchNot calculated on this page. Each half-drop drop is measured as the wall height plus trim plus one full pattern repeat.

3. Add each wall

Wall 1

Width (mm)Height (mm)

Full-height openings (optional)

Add an opening only when it runs from ceiling to floor. A normal door or window still needs wallpaper above or below, so it does not reduce this estimate.

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Current estimate

Plan for 2 rolls

Your walls need 7 full drops. Each drop includes the trim and any straight pattern repeat.

Estimated rolls2Whole rolls

Required drops7After qualifying full-height openings

Recorded plan details

Layout Foundry wallpaper estimate
Roll: 530 mm wide × 10,000 mm long
Combined trim allowance per drop: 100 mm
Pattern: No match or random match
Pattern repeat: 0 mm
Walls:
- Wall 1: 3,600 mm wide × 2,400 mm high
  - Openings: none
Estimated rolls: 2
Required drops: 7
Adjusted drop length: 2,500 mm
Drops per full roll: 4
Unused roll length after full drops: 0 mm
Opening treatment: No openings have been deducted from the estimate.
Rounding: wall widths round up to complete drops, and straight-match drop lengths round up to the next complete repeat.
Check the product label, batch and hanging instructions before ordering.

How this estimate was calculated

Adjusted drop2,500 mm

Drops per roll4

Before opening deductions7

Tallest wall: 2,400 mm
Remainder after the maximum complete drops on a full roll: 0 mm

No openings have been deducted from the estimate.

Gold drops are included in the estimate. Crossed grey drops are not needed because a full-height opening covers their complete width.

Read all calculation assumptions

Every wall is cut to the tallest entered wall height so drops remain interchangeable.
Trim allowance is the combined extra length added once to every drop.
No pattern repeat has been allowed for.
The drop grid begins at each wall's left edge. Only a ceiling-to-floor opening covering a complete aligned roll-width column saves a drop.
Partial-height doors and windows still need material above or below, so their area is not subtracted.
No spare roll is added for damage, dye-lot matching, unusual set-out or installer preference.