How to use this calculator
- Choose Single wall for one surface, Multiple walls for a standard room with one wall height, or Known net area when you already measured the final papered area.
- Enter the actual sellable roll size from the product label, then add pattern repeat, trim allowance, and extra allowance.
- Add paste coverage, rolls per pack, or pack size only if your product label provides them.
- Review strips, rolls, and paste packs, then copy the URL if you want to share the same setup.
A practical sample is preloaded so results appear immediately.
Inputs
Use this for one feature wall or one flat wall section.
Add one row per repeating wall width. This mode assumes the same wall height for all rows.
Use this when you already know the net papered area or the supplier's usable coverage per roll.
Paste results
Important notes
Do not auto-subtract openings in strip modes
Short offcuts, trimming, and pattern matching often keep real roll demand close to the full-wall estimate. If you already measured the exact net papered area, use the Known net area mode.
Double-roll products
Enter the dimensions or usable coverage of the actual sellable unit you are buying. If your supplier lists a double roll, enter the double-roll size and read the result as double rolls.
Known net area mode is approximate
This simple mode assumes the usable coverage per roll already reflects pattern repeat and trim losses.
How the estimate is calculated
- Single-wall and multiple-wall modes use a strip method. Wall width determines strip count, and wall height plus trim plus pattern repeat determines strip length.
- Usable strips per roll are the roll length divided by strip length, rounded down because partial strips are not usable.
- Base rolls divide the strips you need by the usable strips per roll and round up. Purchase rolls then apply your extra allowance and round up again.
- Paste can be estimated either from papered area or from rolls per pack, depending on what your product label provides.
FAQ
How accurate is this wallpaper roll estimate?
Use it as a planning baseline. Real jobs vary with pattern match, offcuts around openings, installer technique, and product-specific yield. Always check the roll label and supplier guidance before ordering.
Should I subtract windows and doors?
Not automatically in the strip modes. Small openings often do not reduce roll needs very much because trimming, matching, and short offcuts still consume paper. If you already measured the exact net papered area, use the Known net area mode instead.
What is pattern repeat?
Pattern repeat is the vertical distance before the design repeats. Larger repeats increase the strip length you must cut, which reduces the usable yield from each roll.
My wallpaper is sold as a double roll. What should I enter?
Enter the dimensions or usable coverage of the actual sellable unit you are buying. If your supplier lists a double roll, enter the double-roll size and read the result as double rolls.
Why do the rolls and paste packs round up?
Rolls and paste are sold as whole units, and real jobs rarely fit exact decimals. Rounding up is safer than running short in the middle of a job.
What to open next
Comments
Share planning tips, tricky repeat-match cases, or product-label caveats that help others estimate more realistically.