How do I calculate how much wallpaper I need?

To calculate wallpaper needed: divide wall width by wallpaper width (typically 20.5 inches for US rolls) to get number of strips, then multiply by wall height plus 4 inches for trimming. For pattern wallpaper, round up to the next pattern repeat. Example: For a 12ft wide, 8ft tall wall, you need about 7 strips × 100 inches = 700 inches, or about 2-3 double rolls.

What is pattern repeat in wallpaper?

Pattern repeat is the distance between where the pattern starts and where it repeats. When hanging patterned wallpaper, you need to match patterns between strips, which creates waste. For example, with a 21-inch repeat, you may need to cut strips longer to align the pattern. Solid or textured wallpapers have no repeat waste.

How much does one roll of wallpaper cover?

A standard US double roll covers approximately 56 square feet (27 inches wide × 33 feet long). A single roll covers about 28 square feet. European rolls are typically 20.5 inches wide × 33 feet. Always account for 10-15% waste for trimming and pattern matching.

Wallpaper Calculator

Wall Height (feet)

Total Wall Width (feet)

Pattern Repeat (inches)

*Enter 0 for solid/textured wallpaper. For patterns, enter the repeat length.

Roll Width (inches) *Standard US: 20.5" or 27"

You need approximately...
0 double rolls

• Number of strips needed: 0
• Cut length per strip: 0 inches
• Includes 4" trimming allowance

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*Based on standard 33ft double rolls.
*Results are estimates. Order extra for matching patterns.