Wallpaper Calculator
Enter your room's perimeter and wall height to estimate the number of wallpaper rolls needed, accounting for roll coverage and pattern repeat waste.
Results
- Rolls needed
- 9 rolls
- Wall area
- 410 sq ft
- Usable per roll
- 50.4 sq ft
Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.
Enter your room's perimeter and wall height to estimate the number of wallpaper rolls needed, accounting for roll coverage and pattern repeat waste.
How to use the wallpaper calculator
- Enter the room perimeter in ft.
- Enter the wall height in ft.
- Enter the openings to subtract in sq ft.
- Enter the coverage per roll in sq ft.
- Enter the pattern repeat.
- Optionally add a price to estimate the total project cost.
- Read your quantities instantly — no sign-up, and you can print the estimate to take to the supplier.
Worked example
Inputs
- Room perimeter
- 50 ft
- Wall height
- 9 ft
- Openings to subtract
- 40 sq ft
- Coverage per roll
- 56 sq ft
- Pattern repeat
- Small repeat (10% waste)
Results
- Rolls needed
- 9 rolls
- Wall area
- 410 sq ft
- Usable per roll
- 50.4 sq ft
Using the example values above, the wallpaper calculator returns 9 rolls (rolls needed). Change any field to match your own project and the numbers update instantly.
Formula
Wall area = perimeter × height − openings. Rolls = area ÷ usable coverage per roll, rounded up.
Frequently asked questions
- How many rolls of wallpaper do I need?
- Calculate wall area (perimeter × height minus openings) and divide by the usable coverage per roll, adding waste for the pattern repeat.
- Why does pattern repeat increase rolls?
- Matching a repeating pattern means trimming the top of each strip, wasting 10–25% of every roll depending on the repeat size.
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