How this estimate works
The calculator applies: ceil(wallArea x (1 + waste/100) / coverage). Keep measurements in one unit system and round up when suppliers sell whole units.
Limitations
Pattern repeat, matching, doors, corners, and batch consistency can change the order.
Source to check
Read the authoritative guidance for wallpaper calculator
Frequently asked question
What is pattern waste? It is extra paper needed to align a repeating design across drops.