Wallpaper Calculator
Estimate wallpaper rolls from wall width, wall height, roll size and pattern repeat.
Set your values
Adjust the values, then calculate your result.
How to use Wallpaper Calculator
- Enter the measurements or amounts in the fields above.
- Check that dimensions, rates and units match the labels.
- Select “Estimate wallpaper rolls” to see a clear estimate and the formula used.
How the wallpaper calculator works
Drops = total wall width ÷ roll width, rounded up. Usable drop length includes the wall height plus pattern repeat; rolls are rounded up by drops per roll.
Check your measurements and assumptions
This estimate assumes continuous walls and one roll size. Door and window deductions are omitted because pattern matching and offcuts can offset the saved area. Follow the manufacturer’s instructions.
Review the estimate before you act
Compare this result with an independent measurement, supplier quote or institution guidance when the decision matters. Confirm that the units and assumptions match the labels above, and update the inputs when the conditions change. Keep a note of the values used so you can reproduce the estimate later. This calculator is a planning aid and does not replace professional, product-specific or local guidance.
Why does wallpaper pattern repeat matter?
A larger repeat can create more offcut at the top of each drop, reducing how many full-height drops fit in a roll.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.