How to use it
- Enter room size and wall height.
- Enter doors and windows.
- Enter roll width, roll length and pattern repeat from the label.
The formula
Strips = (perimeter − openings) ÷ roll width
Strips per roll = roll length ÷ (wall height + repeat + 4 in trim)
Rolls = strips ÷ strips per roll
Worked example
| Room length | 14 ft |
| Room width | 12 ft |
| Wall height | 8 ft |
| Doors | 1 |
| Windows | 1 |
| Roll width | 20.5 in |
| Roll length | 33 ft |
| Pattern repeat | 0 in |
Result
| Rolls | 10 |
| Strips needed | 28 |
| Full strips per roll | 3 |
| Wall area | 416 ft² |
Tips before you order
- Large pattern repeats waste more paper — order an extra roll.
- Check that every roll has the same batch (dye lot) number.
Questions
How many rolls of wallpaper for a 12×14 room?
With 8 ft walls and a standard 20.5 in × 33 ft roll, about 10 rolls, depending on openings and repeat.