Free Wallpaper Calculator
Calculate how many rolls of wallpaper you need for a room based on wall dimensions.
ft
ft
sq ft
sq ft/roll
Rolls Needed
9
Net Wall Area428 sq ft
Area with 10% Waste471 sq ft
Rolls Needed vs Room Perimeter
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)
Example Calculation
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
Frequently Asked Questions
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