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Wallpaper rolls come in a range of widths and lengths, so figuring out how many you need means converting your wall area into the same units as a single roll's actual coverage. This calculator finds how many wallpaper rolls a given wall area needs, based on your specific roll dimensions and a waste allowance for pattern matching and cuts.
How it works
Enter the total wall area to be papered, your roll's width and length, and a waste percentage. The calculator finds the coverage of a single roll, adds the waste allowance to your area, and divides to find the number of rolls needed.
- Enter total wall area (sq ft).
- Enter roll width (in).
- Enter roll length (ft).
- Enter waste allowance (%).
- Click Calculate to see your results.
Examples
300 sq ft with a 21"x33' roll
With a 15% waste allowance for pattern matching, this room needs 6 rolls of wallpaper.
Who should use it
- Estimating how many rolls to order for a room wallpaper project.
- Budgeting wallpaper material costs before starting a renovation.
Industry applications
- Interior design and home renovation
- Wallpaper retail and installation services
Advantages
- Adjusts for any roll size, not just one standard dimension.
- Includes a customizable waste allowance for pattern matching.
Limitations
- Doesn't automatically adjust the waste allowance for pattern repeat size — that must be factored into the percentage you enter.
Common mistakes to avoid
- Using too low a waste allowance for a large repeating pattern, which requires more material per usable square foot than a plain design.
- Forgetting to check the roll's specific coverage rating, since roll sizes vary between manufacturers and wallpaper types.
Best practices
- For large pattern repeats (12+ inches), increase the waste allowance toward 20-25% to account for the extra matching required between drops.
Tips
- Buy all rolls from the same dye lot at once when possible, since color can vary slightly between production batches.