Decorating

Wallpaper calculator

Estimate wallpaper rolls from wall dimensions, roll coverage, pattern repeat and waste.

Transparent formulaFormula v1.0 · adjusted wall area ÷ usable roll coverage

Scope boundary: Roll estimates are a planning guide; check the manufacturer's stated batch, pattern and hanging guidance.

Check the path

Your calculation audit

Every total is shown as a short sequence so you can see what was measured, deducted, adjusted and rounded.

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Measure clearly

Simple guidance

Measure each wall's width and full hanging height. Keep pattern repeat separate from roll width and length; pattern matching can reduce useful coverage.

Measure the finished surface or internal clear dimensions. Keep a note of any deduction you make.

Worked example

Follow the same logic

A 4 m × 2.4 m wall less 1.8 m² of openings has 7.8 m² to cover. The tool allows for repeat and the selected waste percentage before rounding rolls up.

Planning tipWrite down the product factor or pack size you used, so a later change is easy to trace.

Review record

Transparent, source-ready method

Last reviewed: 15 October 2026. Formula version: v1.0. Source/review data to be added — Calculator.Shop does not present placeholder figures as an authoritative trade specification.