How to use the Wallpaper Calculator

Estimate wallpaper roll quantity allowing for openings and pattern waste.

Calculation formula

Effective area = max(wall area − openings, 0); rolls = ceil(effective area × (1 + waste%) ÷ usable roll coverage).

Recommended steps

1. Enter values using the units shown beside each field.
2. Review whether the example assumptions match your situation.
3. Run the calculator and compare the key metrics.
4. Use the source data or official rates when precision matters.

Known limitations

Pattern repeat, roll dimensions and cut layout can raise actual demand substantially.