Tool No. 2

Wallpaper quantity calculator

Counts real drops (full-height strips), not just wall area, so pattern repeats and cutting waste are included.

Units

Walls

Name

Width (in)

Height (in)

Doors, windows & other openings

None added.

Roll & pattern

Roll width (in)

Roll length (ft)

Pattern repeat (in)

0 = no repeatMatch

Trim per drop (in)

top + bottomExtra allowance (%)

mistakes, future repairsPrice per roll (optional)

Your estimate

3 rolls

An estimate, not a final purchasing quantity.

How this is worked out

Each wall needs width ÷ roll width drops, rounded up.
Each drop is wall height + trim, rounded up to a whole pattern repeat. Half-drop patterns add half a repeat. No repeat or random match adds nothing.
Drops per roll = roll length ÷ cut length, rounded down. Leftover pieces are not counted.
Openings only save a drop for each full roll width they span, since paper above and below doors and windows still needs cutting.
Uses the tallest wall's cut length for every drop.
Buy every roll from the same batch and check the manufacturer's label and your installer's advice before ordering.

Related guides

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