Wallpaper Calculator

Calculate exactly how many rolls of wallpaper you need for your room. Our calculator accounts for pattern repeats and waste.

How to Use This Calculator

Measure the width and height of each wall you plan to wallpaper
Enter the total number of walls (typically 4 for a room)
Check your wallpaper roll for width (usually 21" or 27") and length (typically 33')
If your wallpaper has a repeating pattern, enter the pattern repeat distance
Subtract any large windows or doors from the total area

Total Wall Area: Width × Height × Number of Walls

Usable Area: Total Area - Windows/Doors

Roll Coverage: (Roll Width ÷ 12) × Roll Length

Rolls Needed: Usable Area ÷ Roll Coverage × Waste Factor

The waste factor is 1.1 (10%) for solid colors and 1.2 (20%) for patterns to account for matching and trimming.

We recommend 10-15% extra for solid colors and 15-20% for patterns. Our calculator already includes this allowance.

Pattern repeat is the distance between where a pattern repeats on the wallpaper. It's important for matching patterns across strips.

Only subtract large windows and doors. Small windows and standard doors are often left in the calculation as a buffer.

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