Installer checking alternating cuts
Inspect half-drop phases without a generic waste percentage.
Enter uniform reviewed demand and repeat, then inspect every bolt.
Accounts for cuts, leaders and tails without claiming an optimal order.
Wallpaper Roll Calculator
Inspect a complete uniform-drop cutting schedule with free, straight or half-drop matching on exact physical wallpaper bolts.
Built for Interior1 documented formula1 guided projectPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Independently reviewed uniform drop count and final cut length, physical/usable bolt dimensions, leader, exact repeat and selected match
Output to expect
Every registered cut start/end and bolt, alternating phases, alignment gaps, leaders and unassigned tails
How it works
Allocate cuts in fixed order at free, straight or half-drop starting phases; independently reviewed mode makes no additional alignment claim
- Verify the same usable matching datum after the entered leader on each bolt and include all reviewed trim in final cuts.
- Confirm the independent drop requirement and exact product plan; this is not wall-area inference, minimum-bin optimization or cutting approval.
Choose your path
Built around the job you need to finish
Place a reviewed uniform drop list on registered physical bolts with explicit pattern-phase accounting.
Estimator comparing bolt lengths
Know when the final cut actually fits.
Compare free/straight/half-drop schedules and physical cut end positions.
Gets a complete schedule or an impossible-cut error, never truncation.
Metric specification reviewer
Retain original measurements while reading other units.
Switch display units, inspect raw inputs, download and explicitly save.
Can reproduce cuts from the retained raw values and units.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- Measure your room and identify the product matchGraham & Brown · Measured walls and product-specific repeat/match, including the 64/32 offset example. No universal extra-order allowance is inferred.
- Wallpaper product and pattern-match FAQsSanderson Design Group · Random, straight and half-drop definitions; actual dimensions and current instructions remain product-specific. Other offsets and special panels require separate review.
- Single rolls, double rolls and boltsBrewster Home Fashions · Quoted single-roll units versus continuous bolts supplied; verify the exact quote instead of assuming universal dimensions or billing rules.
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Projects using Wallpaper Roll Calculator
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Independent drop demand
The uniform final cut includes all reviewed trim and defect provisions. This tool does not infer drop demand from room perimeter or wall area.
Cut material = reviewed number of drops × final cut lengthExplicit pattern phases
Free mode cuts consecutively. Straight mode keeps one phase; half-drop alternates two phases. Other patterns require independently reviewed cuts and carry no automatic phase claim.
Next start ≥ previous end, with the selected phase modulo the vertical repeatAccount for every bolt
The usable origin after the entered leader must be the same verified datum on every bolt. Inspect every source position; a phase plus cut that cannot fit a fresh bolt is rejected.
Bolt length = entered leader + alignment gaps + cuts + unused tailUpdated: August 2026
Example Scenarios
Seven 100-inch cuts with a 24-inch repeat on 396-inch bolts use three physical bolts in this fixed alternating sequence. Inspect each start phase and tail.
Three free-match 132-inch cuts fit a 396-inch physical bolt. A matching phase can change the schedule; the unused tail is not rounded as another cut.
Keep the original feet and inches while changing display to meters and millimeters, then download the complete raw record for independent review.
Common Mistakes to Avoid
Common Mistakes to Avoid
Adding a repeat percentage to gross area
Enter actual drop lengths, physical bolt dimensions and the exact match basis; inspect individual alignment gaps.
Assuming every raw bolt begins at the same pattern point
Verify a common usable datum and reserve the required leader on every physical bolt before relying on this schedule.
FAQ
No. Enter a separately reviewed uniform drop count and cut length. Use the wall-by-wall calculator for measured rectangular walls.
An alternating starting phase can use material before the cut. The phase plus final cut must fit on each fresh registered bolt.
No. It preserves reviewed drop order rather than searching alternative nesting, interleaving, two-bolt cutting methods or offcut reuse.
The entered cuts are placed consecutively with no additional pattern alignment. The independent source must account for the actual pattern and product constraints.
Yes, up to 200 reviewed drops. JSON includes every cut and bolt, original measurements and exact Project outputs. Invalid inputs cannot export a previous result.
About Wallpaper Roll Calculator
Start with an independently reviewed number of full-width drops and final cut length. Inspect where each cut begins and ends on actual physical bolts, including entered leaders, pattern-alignment gaps and unused tails. No area-only or generic repeat-waste factor is applied.