[ \textWeight (kN) = \textDensity (kg/m^3) \times \textVolume (m^3) \times 0.00981 \ (\textto convert kg to kN) ] Simplified: ( \textWeight = \rho \times V \times 0.00981 )

: Higher density often correlates with better thermal mass and sound insulation, while lower density materials like Autoclaved Aerated Concrete (AAC)

Timber has a "density" of 500 kg/m³ when dry. Freshly felled (green) oak can be 1,200 kg/m³. For formwork (shuttering), assume wet timber density.

To use this data effectively, you need the formula for .