Add allowance centimetres before you order rolls
Zero allowance looks tidy on screen and fails on the wall. Add trim before you buy.
14 November 2026
Answer: On the cutting plan, set a realistic allowance (often around 10 cm), re-check strip length, then trust the roll count.
Tool: Wallpaper cutting plan — free, in your browser.
Installers trim for plumb walls and pattern match. A plan with 0 allowance under-orders. Ten centimetres is a common starting point — adjust to your paper and skill level.
Change the allowance field, watch strip length jump, and see whether you tip into another roll. Export the cut list only after that check.
The math stays in your browser. Measure twice on site; the diagram is a plan, not a certificate.