Wallpaper roll calculation
Measure the combined length of the walls and multiply by wall height. Subtract large openings, add a pattern and trimming allowance, then divide by the usable coverage of one roll.
Pattern repeat matters
Large repeats can reduce usable coverage because each strip must align. Use the manufacturer's coverage guidance rather than only the roll's raw length and width, and buy the same dye lot for the whole room.
Related wall tools
Paint · Drywall · Square footage
Frequently asked questions
Should I add extra material?
Yes. Most projects need an allowance for cuts, breakage, uneven surfaces, overlap, or measurement error. The appropriate percentage depends on the material and layout.
Can I use this estimate to place an order?
Use it to plan and compare costs, then verify package coverage and project requirements with the manufacturer, supplier, or qualified contractor before a large purchase.