Wallpaper Roll Calculator with Pattern Repeat
Calculate wallpaper drops and whole rolls from wall perimeter, ceiling height, openings and pattern repeat.
Formula
Planning estimate. Check product specifications and local requirements before purchasing.
Worked example: Wallpaper Calculator
Measurements in this example
| Wall perimeter | 18 m |
|---|---|
| Height | 2.7 m |
| Openings area | 4 m² |
| Roll width | 0.53 m |
| Roll length | 10.05 m |
| Pattern repeat | 0.64 m |
| Waste allowance | 5 % |
Calculated quantities
| Area | 44.6 m² |
|---|---|
| Wallpaper drops | 36 |
| Whole rolls | 12 |
What to check
This calculation uses: Wall perimeter, Height, Openings area, Roll width, Roll length, Pattern repeat, Waste allowance. It returns: Area, Wallpaper drops, Whole rolls.
Measure the full wall perimeter and height, then record large openings. Walls with different heights or feature papers should be calculated separately.
The pattern repeat rounds each drop up to a compatible cutting length. Drops per roll are found from roll length, then the required drop count is rounded to whole rolls.
A large repeat can remove one usable drop from every roll. Compare the calculated cutting length with the manufacturer’s matching instructions.
Do not subtract every window automatically. The pieces above and below openings still require matched drops and may not use leftovers efficiently.
Use the units beside each field. The values in the worked example are starting inputs; replace them with your measurements and the specifications of your material.
Compare alternatives
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.