The Wallpaper Calculator helps you calculate how many wallpaper rolls you need for a room. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Construction Calculators collection.
What You’ll Need
- Total Wall Width (ft)
- Wall Height (ft)
- Roll Width (in)
- Roll Length (ft)
- Pattern Waste Allowance (%)
Formula Used
Wall area = Total Wall Width × Height
Usable roll area = (Roll Width ÷ 12) × Roll Length × (1 − Waste % ÷ 100)
Rolls needed = Wall area ÷ Usable roll area
Example Calculation
Using example inputs — Total Wall Width = 40 ft; Wall Height = 8 ft; Roll Width = 21 in; Roll Length = 33 ft; Pattern Waste Allowance = 15 % — the Wallpaper Calculator returns:
| Value | Result |
|---|---|
| Total wall area | 320 sq ft |
| Usable coverage per roll | 49.1 sq ft |
| Rolls needed | 7 |
7 rolls of wallpaper. Wall area: 320 sq ft, usable area per roll: 49.1 sq ft.
Helpful Information
Results from the Wallpaper Calculator are estimates based on standard formulas used in the construction calculators field. For projects with significant cost, health, or safety implications, consider verifying results with a qualified professional.