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This post was last edited by 955559 on 2018-9-5 at 18:45. Stainless steel pipes are sold by weight; to find out the price of a single pipe, it is necessary to calculate its theoretical weight. The theoretical weight of stainless steel pipes can be calculated based on their outer diameter and wall thickness. Today, I will explain to you the formula for calculating the weight of stainless steel pipes: For round stainless steel pipes, the weight is calculated as (outer diameter – thickness) * thickness * pipe length * 0.02491. For example, the theoretical weight of a 6-meter-long round stainless steel pipe with a wall thickness of 0.9 mm is (51 – 0.9) * 0.9 * 6 * 0.02491 = 6.74 ； Stainless steel square tube: (outer diameter * 4/3.14 – thickness) * thickness * tube length * 0.02491. For example, the theoretical weight of a 6-meter-long 25-mm-thick square tube with a wall thickness of 0.9 mm is (25 * 4/3.14 – 0.9) * 0.9 * 6 * 0.02491 = 4.16 ； Stainless steel rectangular tube: *thickness* *tube length* *0.02491*. For example, the theoretical weight of a 6-meter-long, 30*10 mm square tube with a wall thickness of 0.9 mm is *0.9* *6* *0.02491* = 3.31 ； In the formula, the units for outer diameter and wall thickness are millimeters (mm), while the unit for tube length is meters (m). The weight calculated in this way is the theoretical weight of the tube; when the tolerances on the tube’s outer diameter and wall thickness are small, the difference between this theoretical weight and the actual weight is not significant. Therefore, in purchases of stainless steel tubes, actual weighing is necessary only for larger orders.