We use this  formula to calculate the weight of steel bars in KG/ Meter

(D)2/162.5 * L 

* D = diameter of the bar

* L = length of  the bar So the weight of the 8 mm bar will be
(8×8)/162.5 = 0.39 kg/ meter (For 1 meter length)

Similarly, the weight of bars will be as follows:

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For more information watch this video