Allocate different wallpaper drop heights before buying rolls.
Why can average wall height give the wrong straight-match roll count?
Use the matching calculator
Use this decision sequence
- List every distinct drop height and its measured quantity.
- Add specified trimming before rounding to the straight vertical repeat.
- Remove the entered initial alignment loss from every roll.
- Review the actual longest-first allocation and keep incompatible lots separate.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Average drop height | Can hide pieces that will not fit a roll. |
| Rounded individual drops | Preserve their real cutting lengths. |
| Half-drop pairs | Require the separate paired-drop model. |
Worked comparison
Two aligned drops of 6 m and two of 4 m fit into two 10 m rolls as 6+4 on each roll. The total is 20 m, but a length total alone does not establish fit for other combinations. With an 11 m aligned drop, no 10 m roll can produce that piece even if the average drop length looks small.
Check before using the estimate
Straight-match only. The allocation is feasible rather than guaranteed optimal, and it does not choose alignment loss for an unknown pattern. The example values are illustrative arithmetic inputs. Replace them with your measured plan, selected product information and actual quote where relevant.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.