Wallpaper Roll Calculator

Enter the wall run, height and pattern repeat. The page returns how many strips each roll yields, how many rolls to buy, the real waste and the paste you need — and compares 0.53 m, 0.70 m and 1.06 m rolls side by side.

Wallpaper is sold by the roll but used by the strip, and the strip is longer than the wall because of the pattern repeat. Enter the wall run and height, subtract the openings, pick the roll and the repeat; the page returns the strips, the rolls, the real waste and the paste.

The walls

Measure the full wall run at skirting level, then subtract windows and doors by area.

How to enter the walls Total wall run (m) Wall height (m) Windows and doors to deduct (m²) Pattern repeat Roll size Extra allowance

Rolls to buy –

Strips needed –

Strips per roll –

Pasted area –

Real waste –

Paste powder –

How this was worked out

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Same wall, three roll sizes

Roll size	Strips	Per roll	Rolls	Bought	Waste

Five rules before you order

Calculate by strips, not by area. A 10 m roll does not yield 10 m of wall — the pattern repeat cuts each strip longer.
The extra per strip is half the repeat for a straight match, because adjacent strips are offset to line up. A 53 cm repeat adds 26.5 cm to every strip.
Round the number of rolls up, never down. One roll short means a dye-lot mismatch when you go back for more.
Order all rolls in one batch and check the batch number. A later roll can be visibly different on the same wall.
Subtract windows and doors by area, but do not subtract small openings: the offcuts above and below them are usually unusable.

Practical notes

Add 10% on a normal room and 15% where there are many corners, radiators or sockets. The allowance covers matching and damaged strips.
Cut strips in pairs as you go. Lining up two strips on the table is far easier than on the wall.
A 1.06 m roll needs two people. It covers more per roll, but a crease in a wide strip is hard to flatten.
One 200 g bag of paste powder usually does about 4 standard rolls. Mix thinner for heavy embossed paper.

Four common mistakes

Dividing wall area by roll area. That ignores the pattern repeat and always underestimates the rolls.
Forgetting the repeat. A 64 cm offset repeat can waste almost a third of a roll on a 2.8 m wall.
Buying the exact number of rolls. A single damaged strip then means a second order and a dye-lot risk.
Pasting the wall after the paper is cut. The paper expands when wet; cut after pasting, not before.