Methods & worked examples
Wallpaper Strip & Roll Calculator — Methods & worked examples
How it works
Required strips = ceil(wall width ÷ roll width). For free match, cut length = wall height + combined top/bottom allowance. For straight match, round that length up to a whole vertical pattern repeat. Strips per roll = floor(usable roll length ÷ cut length); rolls = ceil(required strips ÷ strips per roll).
Worked examples
A 400 cm wall and 53 cm roll width need 8 strips. A 240 cm wall height plus 10 cm total allowance gives a 250 cm free-match cut. A usable 1,000 cm roll yields 4 strips, so 2 rolls suffice. With a 64 cm straight repeat, cut length rises to 256 cm; only 3 strips fit per roll, so 3 rolls are needed. The 8 cuts use 2,048 cm out of 3,000 cm, leaving 952 cm across separate offcuts.
Scope & limitations
Deduct initial pattern-alignment waste before entering usable roll length. If rolls have different usable lengths, check them separately. Vertical repeat is not roll width. Offcuts do not form one continuous strip, and reuse is not assumed. No door/window deductions, joining short pieces, half-drop matching, irregular walls, corners or globally optimal cutting are included.
Method sources
Our original explanations and calculators use the methods above. This site is not affiliated with the cited brands or organizations.