Wallpaper Calculator
Calculate how many rolls of wallpaper you need for a room.
Enter room dimensions and roll size to get an instant estimate.
Wallpaper Rolls Needed
Wallpaper estimation calculates total wall area and divides by usable area per roll.
Wall Area = 2 × (Length + Width) × Height
Usable area per roll = Roll length × Roll width × 0.85
The 0.85 factor accounts for pattern matching waste (~15%).
Unit support:
- Feet — standard US/UK rolls: 33 ft × 21 in (57.75 sq ft gross)
- Meters — Euro rolls: 10 m × 0.53 m (5.3 m² gross)
Standard roll sizes:
- US single roll: 33 ft × 21 in (~57.75 sq ft)
- US double roll: 33 ft × 27 in (~74.25 sq ft)
- European roll: 10 m × 0.53 m (~5.3 m²)
Tips:
- Always buy 1–2 extra rolls for mistakes and future repairs
- Large patterns need more waste allowance (up to 25%)
- Subtract roughly 21 sq ft (2 m²) per standard door and 15 sq ft (1.4 m²) per window