Wallpaper Calculator
Calculate how many rolls of wallpaper you need for a room based on wall dimensions.
Rolls Needed
9
Rolls Needed vs Room Perimeter
公式
## How to Calculate Wallpaper Rolls Measure the room perimeter and wall height to get gross wall area. Subtract doors and windows. Add 10% for waste/pattern matching. ### Formula **Net Area = (Perimeter x Height) - Doors/Windows** **Rolls = ceil(Net Area x 1.10 / Coverage Per Roll)**
计算示例
52 ft perimeter, 9 ft walls, 40 sq ft doors/windows, 56 sq ft rolls.
- 01Gross wall area = 52 x 9 = 468 sq ft
- 02Net area = 468 - 40 = 428 sq ft
- 03With 10% waste = 428 x 1.10 = 470.8 sq ft
- 04Rolls needed = ceil(470.8 / 56) = 9 rolls
常见问题
How much waste should I plan for?
Allow 10% extra for general waste. Patterned wallpaper with large repeats may need 15-20% extra for pattern matching.
How do I measure room perimeter?
Add the lengths of all four walls. For a 14 x 12 ft room: perimeter = 14 + 12 + 14 + 12 = 52 ft.
What is standard wallpaper roll coverage?
US standard single rolls cover about 36 sq ft usable, double rolls about 56-72 sq ft. Check the roll specifications before buying.
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