The calculation method of the bar weight is: diameter (mm)*diameter (mm)*0.00617*reinforcement length (m)=reinforcement weight (kg), W=(1/4)0.78πD^2 (D is the diameter of the rebar in centimeters and the result is kg/m). The theoretical weight of steel is calculated based on the nominal size and density of steel (called specific gravity in the past), which is called theoretical weight. This is directly related to the length dimension, cross-sectional area and size tolerance of the steel. Due to the allowable deviation of the steel in the manufacturing process, the theoretical weight calculated by the formula is somewhat different from the actual weight, so it is only used as a reference for estimation.

And in generally, 6MM~12MM rebar allows a maximum drop of 7%, 14MM~20MM rebar allows a maximum drop of 5%, and 22MM~50MM rebar allows a maximum drop of 4%.

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