Question: what is the formula for weight of steel?
Answer: The mass of the bar is volume of the bar multiplied by the density of steel. Density of steel = 8.05 g/cm³. The density of steel varies with composition and it's density ranges from 7.80 g/cm³ to 8.05 g/cm³. This is basic formula and is applicable whether the bar has a circular section or is a flat strip of steel.