Wallpaper Calculator
Estimate wallpaper rolls needed for a room by perimeter, height, doors, windows, roll dimensions, and pattern repeat.
Formula & Explanation
Wallpaper calculation accounts for room dimensions, roll dimensions, and pattern repeat waste. Step 1: Calculate number of vertical strips needed - Strip height = Wall height (adjusted for pattern repeat if applicable) - Number of strips = Ceiling(Perimeter ÷ Roll width in feet) Step 2: Calculate strips per roll - Strips per roll = Floor(Roll length ÷ Strip height) Step 3: Calculate rolls needed - Rolls needed = Ceiling(Number of strips ÷ Strips per roll) Pattern repeat increases strip height, reducing efficiency. A large repeat (e.g., 24 inches) may require significantly more rolls. Example (no pattern): - Perimeter: 40 ft, Height: 8 ft, Roll: 27" × 30' - Strip height: 8 ft - Strips needed: ceil(40 ÷ 2.25) = 18 strips - Strips per roll: floor(30 ÷ 8) = 3 strips per roll - Rolls needed: ceil(18 ÷ 3) = 6 rolls
Assumptions
- •Standard wallpaper rolls are 27 inches wide and 30 feet long (varies by manufacturer)
- •Pattern repeat increases effective strip height and waste; larger repeats require more rolls
- •Calculations do not heavily deduct for doors and windows (reduce perimeter manually if desired)
- •Assumes professional installation; DIY may require additional waste
- •Wall height is consistent (no vaulted ceilings)
- •Wallpaper is hung floor-to-ceiling (not wainscoting or chair rail)
- •Roll coverage varies by brand; this calculator uses roll dimensions as primary input
- •Typical wallpaper cost: $30-$100+ per roll depending on pattern and quality
Example Calculation
40 ft perimeter, 8 ft height, 27" wide × 30 ft long rolls with no pattern repeat requires 6 rolls. At $50/roll, total estimated cost is $300.
Inputs
Results
Standard Wallpaper Roll Sizes
| width | length | coverage | use |
|---|---|---|---|
| 18 inches | 30 feet | ~45 sqft | Specialty, less common |
| 27 inches | 30 feet | ~67 sqft | Most common in US |
| 27 inches | 50 feet | ~112 sqft | Double roll option |
| 36 inches | 30 feet | ~90 sqft | Commercial or specialty |
Frequently Asked Questions
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