How to Calculate Wallpaper Requirements
Wallpaper calculation involves determining the total wall area to be covered and converting it into the number of rolls needed. This calculator helps estimate wallpaper quantities and costs while accounting for pattern matching and waste factors.
The key formulas for calculating wallpaper requirements are:
\[ \text{Wall Area} = 2 \times (L + W) \times H \]
\[ \text{Area with Waste} = \text{Wall Area} \times (1 + \text{Waste Factor}) \]
\[ \text{Rolls Needed} = \frac{\text{Area with Waste}}{\text{Coverage per Roll}} \]
Where:
- L = Room Length (feet)
- W = Room Width (feet)
- H = Room Height (feet)
- Waste Factor = Additional material for pattern matching (typically 15%)
- Coverage per Roll = Square feet covered by one roll
Calculation Steps
- Measure room dimensions (length, width, height)
- Calculate total wall area
- Subtract area of openings (doors, windows)
- Apply waste factor for pattern matching
- Determine number of rolls needed
- Calculate total cost
Example Calculation
Problem:
Calculate wallpaper needed for a room with:
- Room dimensions: 12 ft × 15 ft × 8 ft
- Roll coverage: 56 square feet per roll
- Waste factor: 15%
- Roll price: $45 per roll
Solution:
- Calculate wall area:
\[ \text{Wall Area} = 2 \times (12 + 15) \times 8 = 432 \text{ sq ft} \]
- Apply waste factor:
\[ \text{Area with Waste} = 432 \times (1 + 0.15) = 496.8 \text{ sq ft} \]
- Calculate rolls needed:
\[ \text{Rolls} = \frac{496.8}{56} = 8.87 \approx 9 \text{ rolls} \]
- Calculate total cost:
\[ \text{Total Cost} = 9 \text{ rolls} \times \$45 = \$405 \]
Room Layout Diagram