Wallpaper Calculator
Pattern repeat is what ruins wallpaper estimates. This adds repeat waste per drop and returns whole rolls.
- Usable drops per roll
- 3
- Estimated cost
- $950
- · Buy every roll from the same batch number.
- · A large repeat can push waste above 25% — check the repeat before falling for the pattern.
How to use the Wallpaper Calculator
-
01
Measure the total wall perimeter and the full floor-to-ceiling height.
-
02
Find the pattern repeat, roll width and roll length on the wallpaper label.
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03
Enter the price per roll if you want a material-cost estimate.
-
04
Buy the calculated rolls together and confirm every label has the same batch number.
Frequently asked questions
Should I subtract doors and windows?
For an average room, no. The extra usually covers pattern matching and awkward cuts. Large openings can be calculated separately.
What is pattern repeat?
It is the vertical distance before the design repeats. Larger repeats create more offcut waste on every drop.
What if the wallpaper has a half-drop match?
Use the stated repeat as a starting point and add one extra roll, because alternate drops shift and usually create more waste.
Other tools
Paint Calculator
Work out gallons of paint and primer for any room, including doors and windows.
Flooring Calculator
Boxes of flooring needed for any room, with a waste allowance for cuts and pattern.
Tile Calculator
Tiles, grout and adhesive for floors or walls, with breakage allowance.
AC & Heating BTU Calculator
Estimate the cooling capacity a room actually needs.
These calculators give planning estimates based on the figures you enter. They are not a substitute for a site survey, a structural or load calculation, or professional advice. Always confirm quantities with your supplier or contractor before ordering.