DIYer measuring separate walls
Avoid combined-width rounding across corners.
Name each wall, enter its width/height and inspect numbered strips.
Can reconcile every wall without corner-stock credit.
Wallpaper Calculator
Plan separate walls, full-width drops and registered physical-bolt cuts using exact dimensions, trim and pattern match.
Use this result well
- Inputs that matter
- Up to eight separately measured walls, exact physical/usable bolt dimensions, verified datum and leader, total trim, match basis and full-drop omission positions
- Output to expect
- Per-wall drops and complete source-cut records with physical bolts, alignment, leaders, tails, original units and optional scoped quote
- How it works
- Round each wall independently; preserve original half-drop positions and align actual source starts, without repeat-rounding the unused tail or claiming optimized nesting
- Verify exact product width, length, usable datum on EVERY bolt, repeat/match, lot and current hanging instructions.
- Reconcile corners, partial openings, defects, substrate and installer review; no automatic offcut, spare or installation approval is inferred.
Choose your path
Built around the job you need to finish
Measure separate walls and inspect every registered source cut without inferred opening/corner credit.
Decorator reviewing an opening
Keep partial-opening material and original match phases.
Enter only verified full-height omitted positions and inspect remaining source cuts.
Can recover invalid omissions without a stale or renumbered plan.
Installer checking exact products
Trace trim, datum, repeat and bolt tail.
Review each cut against current product/lot instructions before field approval.
Keeps quantities separate from substrate or installation acceptance.
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 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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Interior
Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Each wall rounds independently
Start a fresh horizontal strip at each wall. Do not combine widths across corners. Only explicitly reviewed full-height drop positions are omitted; partial doors/windows receive no automatic area deduction.
Wall drops = ceil(measured wall width / usable installed strip width)Registered source cuts
Straight starts share a phase; half-drop positions alternate zero and half a repeat. Each bolt starts at a verified datum after the entered leader. Other patterns use independently reviewed final cuts without phase certification.
Final cut = longest wall height + entered total trim; next start follows the selected pattern phaseComplete material record
Inspect all cuts in wall/drop order, up to 200 gross positions across eight walls. Last-cut fit uses its real end, not another repeat-rounded tail. No offcut reuse, spare bolt or minimum-order optimization is inferred.
Purchased length = cuts + alignment gaps + leaders + unassigned tailsUpdated: August 2026
Example Scenarios
Two 4-foot walls with 21-inch usable width need three positions each, even though a combined 8-foot run would round to five.
Review the exact omitted position on the wall diagram. Other positions keep their original half-drop phases; a partial window does not remove a full-height cut.
Compare measured height and trim, physical bolt dimensions, datum, repeat, lot and source cut ends before cutting or purchasing.
Common Mistakes to Avoid
Common Mistakes to Avoid
Subtracting all opening area or carrying a narrow last strip around the corner
Review each wall and omit only verified entire full-height positions; no corner or offcut credit is inferred.
Treating the schedule as a universal minimum order
The fixed wall/drop order is reproducible, not optimized nesting. Confirm product instructions, defects, usable datum, lot and separate reserves.
FAQ
Enter actual physical bolt width/length and separately reviewed usable installed width. Packaging names do not establish continuous dimensions.
Straight starts align to one phase; half-drop starts alternate zero and half the vertical repeat. Every bolt must have the entered verified phase-zero usable origin.
Only enter positions where the reviewed layout removes a whole full-height drop. Partial openings still consume material; the tool does not infer their geometry.
Use an independently reviewed final cut only when this bounded rectangular-strip model applies. Special panels, reverse hanging, other offsets and product-specific layouts need separate review.
Download complete JSON with original values/units and every source cut, copy the record or request printing. Project Save is explicit and does not mark any room gate complete.
About Wallpaper Calculator
Measure each rectangular wall separately, retain partial-opening material and inspect every numbered source cut. Free, straight and half-drop modes use an explicitly verified starting datum on each physical bolt. The sequential schedule is not a minimum-roll optimization or installation approval.