Area
Area is length × width
Wall faces, floors, patios and tile surfaces are usually planned from a measured area. Deduct only the clear openings the tool asks for.
Measure an areaReference
The small set of quantities behind useful material lists.
Calculator.Shop keeps quantities traceable. These reference notes explain the ideas that recur across the current tools without presenting a generic rule as a product specification.
Volume
Volume adds a depth
Concrete, screed, gravel and soil use area multiplied by the chosen fill or layer depth. Keep separate layers as separate quantities.
Calculate a volumeCoverage
Coverage connects product to surface
Paint and adhesive quantities are only as useful as the coverage figure for the chosen product and application.
Use a coverage rateRounding
Purchase units round up
Bags, tins, rolls, packs and individual units are rounded up so a materials list can be discussed with a merchant.
See the process