Wallpaper Calculator

Pack real full-height drops into physical rolls and account for free, straight, or half-drop pattern matching—not wall area alone.

Wallpaper roll planFull-height drops are packed sequentially; openings are not blindly deducted.

3wallpaper rolls

Full-height strips: 8
Longest trimmed drop: 8.2 ft
Average strips per roll: 2.7
Rolls including spares: 3

Openings are not subtracted because full-height strips are still cut across most doors and windows.

Show calculation

8 full-height strips packed sequentially into 32.8 ft rolls with straight match = 3 rolls + 0 spare

Transparent method and editable product assumptions. Verify current labels and project requirements.

How this calculator works

Each wall group is converted to a whole number of full-height strips. The tool does not deduct doors or windows automatically because a full drop is normally cut across them; true savings require a piece-level layout.

Free match places drops back-to-back. Straight match advances the roll until each drop begins on the same repeat phase. Half-drop alternates phase by half a repeat and simulates the cuts sequentially, opening a new roll when the next aligned drop will not fit.

Physical roll width and length control the calculation. Retail terms such as single or double roll are not enough without dimensions. The optional second wall group lets different heights share the same sequential roll plan; A/B-roll systems and murals remain separate product workflows.

Formula

Strips per wall = ceil(wall width ÷ roll width); each drop = wall height + trim; repeat alignment is packed before the next cut

The live substitution appears with your result.

Control example: 4 m × 2.4 m wall

A 0.5 m roll width needs 8 strips. With 0.1 m total trim, each drop is 2.5 m.

A 10 m free-match roll fits 4 drops, so 2 rolls. With a 0.64 m straight repeat, aligned drops pack 3 per roll, so 3 rolls.

Assumptions and limits

Walls in a group share one height.
Rolls begin at a confirmed zero phase.
Half-drop means an offset of one-half repeat.
Offcuts are not globally optimized or reused across arbitrary wall pieces.

Common measuring mistakes

Dividing wall area by roll area and ignoring full-height strips.
Subtracting every window as if it saved complete drops.
Using “double roll” without entering physical dimensions.
Treating A/B rolls or murals as a generic half-drop pattern.

Sources

Product-specific values remain editable. These sources support the method and stated examples; they are not a universal substitute for your supplier’s current label.

Graham & Brown wallpaper FAQ Defines pattern repeat, straight and offset cutting, and trimming.
York Dogwood product label Example of physical width, length, repeat, and drop match stated together.
Graham & Brown A/B-roll guide Supports treating paired-roll systems as a separate case.

Questions people ask

Should I subtract windows and doors?

Not automatically. Full drops are still cut across many openings; savings need a specific piece layout.

What is a half-drop match?

Adjacent strips begin half a repeat apart. The calculator alternates that start phase and packs cuts sequentially.

Can two wall heights share rolls?

Yes. Enter a second width and height group. The plan remains sequential and does not claim globally optimized offcut reuse.