Wallpaper Calculator
Estimate how many wallpaper rolls you need with a detailed strip-based and area-based calculator for accent walls, full rooms, pattern repeats, doors, windows, and waste.
Use this calculator before ordering wallpaper for an accent wall, powder room, bedroom, dining room, nursery, hallway, or full-room refresh. It estimates rolls using both strip count and net wall area, then recommends the safer number so you have enough material for pattern matching, trimming, and real-world waste.
Wallpaper Roll Estimator
Calculate rolls needed
Enter your wall or room measurements, roll size, pattern repeat, and openings. The calculator compares strip count and net area to give a safer roll estimate.
How to measure for wallpaper
- Measure the total wall width you plan to cover. For a full room, measure the perimeter by adding all wall lengths together.
- Measure from the baseboard or floor to the ceiling, crown molding, or ending point of the wallpaper.
- Enter the roll width and roll length shown by the wallpaper manufacturer.
- Add the pattern repeat if the wallpaper has one. Patterned wallpaper usually needs more material than solid or random-match wallpaper.
- Subtract major doors and windows, but do not over-subtract. You still need full strips around openings for a clean result.
Why this calculator uses two estimates
A simple square-foot calculator can undercount wallpaper because wallpaper is installed in vertical strips. This tool compares a strip-based estimate with a net-area estimate and uses the higher number as the recommended roll quantity.
Quick wallpaper buying tips
- Order all rolls at the same time so the dye lot matches.
- For large repeats, textured wallpaper, or beginner DIY installs, consider ordering one extra roll.
- Check whether your wallpaper is sold as single rolls, double rolls, or by the bolt.
- Always confirm final quantities with the installer or wallpaper brand before purchasing expensive or custom wallpaper.
Wallpaper calculator FAQ
Should I subtract windows and doors?
You can subtract large openings, but be careful. Wallpaper is cut in full drops, so a window or door does not always reduce the number of strips needed.
What is pattern repeat?
Pattern repeat is the vertical distance before the design repeats. The larger the repeat, the more extra material may be needed to line up the design.
How much extra wallpaper should I buy?
For most projects, 10% extra is a good starting point. Use 15% to 20% for large pattern repeats, complex walls, stairs, or if you want spare material for future repairs.