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Revision GuideConstruction & DIY

Paint, Tiles, Flooring, and Wallpaper Calculator Guide

A stronger finishing guide for paint, tiles, flooring, wallpaper, and sheet coverage, built around practical waste, cuts, pack rounding, and layout reality.

Filename: paint-tiles-flooring-and-wallpaper-calculator-guide.pdfFile size: 4 KB

Formula highlights

Paint requirement
paint = area x coats / coverage per litre

What this pack covers

This guide is for the stage where a measured room has to become an order quantity for finish materials sold in tins, rolls, boxes, or sheets.

Coverage reminders

  • Paint needs a clear coat assumption.
  • Tiles and flooring need allowance for cuts and spare stock.
  • Wallpaper needs thought about drop length and pattern repeat.
  • Plasterboard depends on sheet layout as well as area.

Worked example: paint

Forty square metres at 10 square metres per litre per coat requires 4 litres per coat before waste and touch-up allowance.

Worked example: flooring or tiles

Eighteen square metres with 1.8 square metres per box gives 10 boxes on clean area alone, but practical orders usually round above that because packs are discrete and offcuts are real.

Common mistakes

  • Treating clean area as the final order quantity.
  • Ignoring pack rounding.
  • Subtracting every opening mechanically without considering practical waste.
  • Using wallpaper roll area without checking useful yield from drop layout.

Best offline use

Use this pack for fit-out planning, shopping lists, and quick checks before ordering finish materials.

Related calculators

Use the formulas in live tools.

More downloads

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