How to Calculate Wallpaper Rolls for an Accent Wall
Measuring your walls correctly is key to ensuring you purchase the right amount of wallpaper. Underestimating rolls leads to mismatched dye lots, while overestimating adds unnecessary expenses. This calculator deducts door and window openings and applies pattern match repeats to output precise roll numbers.
Wallpaper Roll Types & Coverage Specifications
| Roll Standard | Width | Length | Total Coverage |
|---|---|---|---|
| Double Roll (US Standard) | 20.5 inches | 33 feet | 56 sq ft |
| Single Roll (US Standard) | 20.5 inches | 16.5 feet | 28 sq ft |
| Euro Roll (Standard) | 21 inches | 33 feet | 57.75 sq ft |
Frequently Asked Questions
What is the difference between single and double wallpaper rolls?
A standard US single roll of wallpaper is 20.5 inches wide by 16.5 feet long, covering approximately 28 square feet. A standard double roll has the same width but is twice as long (33 feet), covering 56 square feet.
How do I calculate pattern repeat waste for straight vs drop match?
A straight match pattern aligns horizontally across wall strips, creating about 15% waste. A drop match pattern shifts diagonally down on each adjacent strip, creating up to 20% waste. Random match has no repeat offset and creates minimal waste (~10%).
How many windows and doors should I deduct from wall area?
Deduct 15 square feet for each standard window and 21 square feet for each standard door to ensure you do not buy excess wallpaper rolls.