Calculator

Calculate wallpaper to buy

Risk without calculating: not enough rolls, ignored pattern matching, underestimated cuts, different batches.
Benefit: calculation in drops (reliable method), pattern matching accounted for, paste estimate.

Settings

Pro method: width to cover → drops → drops/roll → rolls

A — Measuring

Simple mode Total perimeter + height. Walls mode Add walls (more precise).

Ceiling height (m)

Used to calculate the cut length per drop.

Top/bottom trimming allowance (cm)

Default 20 cm (10 cm top + 10 cm bottom).

Total perimeter to wallpaper (m)

Sum of the wall lengths you will paper (excluding areas not wallpapered).

Add a wall

Name Length (m)

Wall	Length	Action
No walls added.

B — Openings (optional)

Doors (count) Windows (count) Door width (m) Door height (m) Window width (m) Window height (m) Approximately subtract drops across openings This is an approximation. In practice, offcuts are often used for matching.

C — Roll & pattern matching

Roll width (cm) Roll length (m) Pattern match

Matching affects drop length and roll count.

Pattern repeat (cm)

0 cm if there is no repeat.

Add 1 safety roll (recommended) Useful for unexpected needs, cutting mistakes, repairs, same batch.

D — Paste (optional)

Paste coverage (m²/kg)

Adjust to the paste and the substrate.

Paste allowance (%)

Default 10% (absorption, losses).

Results

Width to cover (m)

—

Basis for drops (perimeter or sum of walls)

Estimated net wall area (m²)

—

Walls − openings (if provided)

Wallpaper (drops calculation)

Item	Value
Drop width	—
Drop length	—
Drops needed	—
Drops per roll	—
Rolls to buy	—
Estimated leftover	—
Tip	—

Paste (estimate)

Item	Value
Wall area	—
Openings area	—
Paste needed	—

Always check the manufacturer’s guidance (substrate type, non-woven, vinyl, etc.).

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