Wall Area & Wallpaper Calculator
Calculate net paintable wall surface area with door/window cutouts, and compute wallpaper rolls required with pattern repeat matching.
1. Wall Dimensions
Configure walls to include in the calculation| Wall Label | Length (ft) | Height (ft) | Gross Area |
|---|
2. Openings Deductions
3. Wallpaper Roll & Pattern Settings
Wallpaper Ordering Tips
- • Same Batch / Lot Number: Always ensure all rolls have identical dye lot numbers to avoid subtle shade differences.
- • Keep 1 Extra Roll: Keep a spare unopened roll for future repairs or patch fixes.
How to Use Wall Area & Wallpaper Calculator
- Add one or multiple walls (North Wall, South Wall, East Wall, West Wall).
- Enter the length and height for each wall in feet and inches (or meters).
- Add door, window, or custom architectural cutouts to deduct from the gross wall area.
- Select wallpaper roll type (European Standard 21" × 33 ft or American Double Roll) and pattern repeat match.
- Review your net paintable/tiling square footage, baseboard linear feet, and total wallpaper rolls to purchase.
Key Features & Privacy Guarantee
- Multi-Wall Custom Builder: Calculate single accent walls or all 4 walls of an entire room simultaneously.
- Wallpaper Roll Estimator: Accurately computes rolls required factoring pattern drop and vertical pattern repeats (0 to 24 inches).
- Door & Window Cutout Deductions: Subtract individual openings to calculate true paintable square footage.
- Baseboard & Trim Perimeter: Computes the bottom linear footage for skirting and baseboards.
- Dual Unit Engine: Supports feet & inches as well as metric meters & centimeters.
Frequently Asked Questions
What are the standard dimensions of a wallpaper roll?
A standard single roll (European Metric roll) is 20.5 inches (0.53 m) wide by 33 feet (10.05 m) long, covering approximately 56.4 sq ft (5.3 m²). An American double roll is 27 inches wide by 27 feet long (~60 sq ft) or 21 inches by 33 feet double (~112 sq ft).
Why do I need extra wallpaper for pattern repeats?
When wallpaper has a repeating floral, geometric, or damask pattern, each subsequent strip must be aligned vertically with the previous strip. This trimming can waste 10% to 20% of each roll.
How do you calculate wall surface area in square feet?
Multiply wall length (in feet) by wall height (in feet) to get gross area. Then subtract total door and window areas to get net paintable area.
Should I subtract doors and windows for wallpaper rolls?
For small windows or single doors, professional installers typically do not subtract them if the pattern repeat is large, as the cutouts are used for headers and footers. However, for large patio doors or multiple windows, deducting them prevents buying surplus rolls.