Wallpaper Calculator
Free wallpaper calculator: find out how many rolls of wallpaper you need. Enter wall area, roll dimensions, and patte...
What Wallpaper Calculator does
A wallpaper calculator that estimates the number of rolls needed for a room by entering wall dimensions and roll size. Users input total wall area, roll length and width, and optionally a pattern repeat value to account for alignment extra length. The result shows the calculated roll count, helping homeowners and decorators avoid purchasing too many or too few rolls. The tool defaults to the European standard roll size (10.05 m × 0.53 m) but allows adjustment for different dimensions. It includes a pattern repeat slider and a worked example for a feature wall, showing the math behind the estimate.
How to use the SmartCalc Wallpaper Calculator
- 1
Enter the total wall area in square meters (height times width for each wall, summed)
- 2
Input the roll length and roll width in meters, or adjust from the default European standard
- 3
Optionally set the pattern repeat percentage if the wallpaper has a printed design that needs matching
- 4
View the calculated number of rolls needed, with the option to clear inputs and start over
Best for
Homeowners, decorators, and interior designers who need a quick, free estimate of wallpaper rolls for a room renovation, especially when working with non-standard roll sizes or wallpapers with pattern repeats.
Limitations
- Results are estimates based on input values and do not account for doors, windows, or waste from cutting
- Pattern repeat percentage is a user-adjustable slider; actual waste may vary by design and installer skill
- No unit switching available; all inputs and outputs are in metric units (meters and square meters)
Wallpaper Calculator FAQ
- What is the standard size of a wallpaper roll?
- Standard European wallpaper rolls are 10.05 m long × 0.53 m wide (about 5.3 m² per roll). American rolls are typically 27 ft × 27 in (about 5.6 m²). Always check your actual roll dimensions, as designer and imported wallpapers may use different sizes.
- How does pattern repeat affect the number of rolls needed?
- If your wallpaper has a printed pattern, each strip needs extra length to align the pattern across adjacent strips. The pattern repeat slider lets you add 10–25% depending on the size of the repeat printed on the label, which increases the total number of rolls required.
- Can I use this calculator for rooms with doors or windows?
- The calculator estimates based on total wall area entered; it does not automatically subtract areas for doors, windows, or other openings, so you may want to deduct those spaces from your total wall area before inputting.
- What if my wallpaper roll dimensions differ from the default?
- The tool defaults to the European standard (10.05 m × 0.53 m) but allows you to adjust the roll length and roll width fields to match your specific wallpaper roll dimensions for a more accurate estimate.
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