Enter wall dimensions, roll size, pattern repeat, and openings.

Calculating the right amount of wallpaper for a wall is essential to avoid waste or shortages. The basic calculation is: Wallpaper Area = Wall Width × Wall Height. Then subtract the areas of doors and windows, and add a waste factor (typically 10%) to account for cutting, pattern matching, and errors. For rolls with a pattern repeat, more material is needed to align the pattern correctly. The number of strips is determined by dividing the wall width by the roll width. The number of strips per roll is determined by dividing the roll length by the usable wall height (including pattern adjustments). This calculator helps homeowners, decorators, and contractors estimate the exact number of rolls needed for a wallpapering project, reducing costs and ensuring the job can be completed without running out of materials.

1. Enter the Wall Width and Wall Height in meters.
2. Enter the Roll Width and Roll Length of your wallpaper.
3. Enter the Pattern Repeat (0 if no pattern).
4. Enter the Waste Factor (typically 10%).
5. Enter the total Door & Window Area to subtract.
6. Click Calculate Wallpaper to see the number of rolls needed.
7. The result includes strips needed, strips per roll, and total rolls with waste.
8. Click Reset to restore default example values.