Wallpaper Calculator

Room length, m

Room width, m

Ceiling height, m

Windows and doors, m²

Roll width, m

Roll length, m

Pattern repeat, m

0 — обои без подгонки рисунка.

Result

Wall area, m²41.4
Length of one strip, m2.7
Strips needed17
Strips per roll3
Rolls6
With a spare7
Offcut, m14.4

Counts strips, not square metres

How many rolls a room needs, allowing for pattern repeat, ceiling height and openings, plus how much offcut ends up in the bin.

Estimating wallpaper by area is the reliable way to get it wrong. It hangs in strips, and whatever is left on a roll after the last full strip is waste. A correct estimate always counts strips.

The second trap is pattern repeat. With a 64 cm repeat and a 2.7 m ceiling, every strip has to be cut at 3.2 m — nearly half a metre lost each time, and roughly a third more rolls.

What this calculator shows

How many strips the perimeter needs and how many come out of one roll
The roll count and a figure with one spare
Metres of offcut, which tells you whether a longer roll would pay

What to keep in mind

Strips are hung vertically, butt jointed. Horizontal hanging needs a different calculation.
Openings reduce the area but not the strip count: paper is still needed above doors and below windows, and those offcuts rarely get reused.

FAQs

What is pattern repeat and where is it stated?

The distance over which the design repeats. It is printed on the roll label in centimetres, next to a double-arrow symbol. Zero or a dash means no matching needed.

Why not just divide by area?

Because the tail end of a roll shorter than one strip has no use. Area-based estimates come up short, typically by a roll, and by two once a pattern is involved.

Should I buy a spare roll?

Yes. Batches vary in shade and matching one a month later is close to impossible. That is what the "with a spare" figure is for.

What roll sizes exist?

The most common is 0.53 by 10.05 m, with wide rolls at 1.06 by 10.05. Metre-wide 25 m rolls also exist. The label always states it — enter yours.

Worked example

A 5 by 3.5 room in plain paper

Input: 17 m perimeter, 2.7 m ceiling, 1.06 × 10.05 m roll, no repeat

Output: 17 strips, 3 strips per roll, 6 rolls

Note: That buys 60.3 m of paper to hang 45.9 — fourteen metres of offcut. With a large 1.15 m repeat each strip is cut at 3.45 m, a roll yields only two, and the order jumps to nine rolls.

Useful links

All tools in Building & Repair

Wallpaper Calculator

Result

Related tools

Wall Area Calculator

Paint Calculator

Drywall Calculator

Useful links