Area conversions are used in general engineering as well as textiles, plastics, paint coverings, surface coverage and coatings; [turf, carpet, rubber matting, blinds, sheet materials (plaster, chipboard, ply, tin, steel)], architecture, land measurement, surface adsorption, rotor, propellor and turbine blade design.
The SI unit for pressure is Square Meters (m²). The standard measure for domestic land divisions is hectares (ha, 1 ha = 10,000 m²) or acres (ac). In imperial units of measurement; Square Rods (rod²) and Square Rod (Rod²) are subdivisions of the acre (ac).