Calculate exactly how many rolls you need for your room
This calculator helps you determine exactly how many rolls of wallpaper you need to cover your walls. Follow these steps for an accurate estimate:
Wallpaper is typically sold in standard roll sizes, though dimensions can vary by manufacturer:
The pattern repeat is the vertical distance before the design repeats itself. When hanging wallpaper, you need to align patterns between strips, which creates waste. Larger pattern repeats mean more waste per roll. A 0-inch repeat (solid or random pattern) means minimal waste, while a 24-inch repeat can reduce coverage by 15-25% per roll.
The calculator automatically accounts for important factors that affect your wallpaper needs:
A 10-15% waste factor is built in to cover:
When you enter a pattern repeat measurement, the calculator reduces the usable coverage per roll because each strip must start at the correct point in the pattern. This is essential for accurate estimates with patterned wallpaper.
A standard American roll (20.5 inches × 33 feet) covers approximately 56 square feet. However, after accounting for pattern matching and waste, the usable coverage is typically 25-30 square feet per roll, depending on the pattern repeat.
For simplicity and to ensure you have enough material, many professionals don't subtract for openings smaller than 3-4 square feet. The extra material accounts for waste and future repairs. For large windows or patio doors, you can toggle those walls off or reduce their height.
If there's no pattern repeat listed, enter 0. This applies to solid colors, textured papers with no visible pattern, or random-match patterns that don't require alignment.
Always order at least one extra roll beyond the calculated amount. For complex patterns or large projects, consider ordering 2 extra rolls. Leftover wallpaper is invaluable for future repairs, and you may not be able to reorder the same batch later.
Yes! Simply create a "wall" with the dimensions of your ceiling. For ceiling application, consider increasing the waste allowance as ceiling installation is typically more difficult and generates more waste.
American rolls are typically wider and shorter (20.5" × 33'), while European rolls are narrower and longer (21" × 33' or 20.5" × 11 yards). Always check your specific product packaging for exact dimensions as manufacturers vary.
For small obstacles like outlets and switches, don't subtract them—they're covered by waste allowance. For larger features like fireplaces or built-in shelving, you can either toggle that wall off or reduce the wall width measurement accordingly.