MEASURE ONCE. PLAN YOUR PURCHASE.

Wallpaper Rolls calculator.

Count full-height wallpaper drops with pattern repeat, trim and matching allowance.

PAINTING

Your inputs

Measurement schematic, not to scale. Use your own dimensions and product specification.

Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.

Roll width

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Roll length

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Pattern repeat

Extra length per drop

Pattern match

Waste allowance

Shortcuts only; choose your own allowance above.

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Wall 1

Wall width

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Wall height

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

YOUR ESTIMATE

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A clear estimate starts here.

Enter your dimensions and product details to see the quantity and purchase breakdown.

CONTINUE YOUR PLAN

Find the next material.

Keep the quantity, then use another tool for the remaining parts of your purchase.

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Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

Required strips round up across each wall. Cut length rounds up to a whole pattern repeat; half-drop mode includes a half-repeat offset before rounding. Equal cut lengths pool together.

Rolls = Σceil(drops at same cut length / drops per roll)Calculated with normalised units

A worked example

Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.

Roll width: 0.5 m
Roll length: 10 m
Pattern repeat: 300 mm
Extra length per drop: 200 mm
Pattern match: Straight / no offset
Waste allowance: 0 %
Wall width: 4 m
Wall height: 2.5 m

Wallpaper rolls to purchase: 3 rolls

Rolls for different cut heights are kept separate. Mixed-height offcut reuse and door/window deductions are not optimised.

Drops and pattern matching matter more than wall area alone

A roll is divided into full-height drops. Pattern repeat, trimming and matching can consume length that an area-only estimate overlooks.

Measure each wall height and length, including changes in height.
Use the roll’s usable width and length and the stated matching pattern.
Do not assume offcuts cover another full-height drop. Review the drop calculation before buying.

What changes when one measurement changes?

Using the worked example above, change only wall height from 2.5 to 3.2m. Product specifications and all other inputs stay the same.

Wallpaper rolls to purchase: 3 → 4rolls

Both results are computed by the same current calculator engine. These are illustrative dimensions, not material or design recommendations.

Calculate a half-drop matching task Plan wallpaper for a room

Calculation version and responsibility

Formula version: 1. Input schema: 1. Output schema: 1. Material data: user-supplied. Safety text: 1.

The method uses your dimensions and supplied product properties. Software tests check arithmetic examples and validation; this does not establish professional review of a design. Read the calculation policy.