Hexagonal (hexagonal) bar weight is calculated from the measurement between two opposing flat faces (across flats). You can calculate for steel, stainless steel (304, 316), aluminum, copper, brass, bronze, cast iron and other metals, and enter the density yourself for the material that is not listed.
Formula
A = (√3 ÷ 2) × s² ≈ 0.866 × s²
Example
The meter weight of the 20 mm across-flats steel hexagonal bar is 2.72 kg/m.