What formula is used to calculate the weight?

Weight = ((outer_side^2) - (outer_side - 2 * wall_thickness)^2) * length * density. The cross-sectional area of the hollow section is multiplied by length and material density.

Which stainless steel grades are supported?

The calculator supports grades 304 / 316 (7,900 kg/m³), 310 (7,900 kg/m³), 410 / 420 (7,750 kg/m³), and 430 (7,700 kg/m³). Grade 304 and 316 share the same nominal density of 7,900 kg/m³ per industry standards.

Can I use millimeters for length?

Length is entered in meters for convenience. For short pieces, enter a decimal — for example, 500 mm = 0.5 m, 250 mm = 0.25 m.

What is the maximum wall thickness I can enter?

The wall thickness must be strictly less than half the outer side length, otherwise the inner dimension would be zero or negative. The calculator validates this and shows an error if violated.

Does this account for weld seam or surface finish?

No. The formula uses theoretical nominal dimensions. Actual weight may vary slightly due to manufacturing tolerances, weld bead, or surface treatments.

What units does the result use?

Results are shown in kilograms (kg) and pounds (lb). Linear density is displayed as kg per meter (kg/m), which is useful for ordering cut-to-length stock.

Stainless Steel Square Tube Weight Calculator

Name: Stainless Steel Square Tube Weight Calculator
Availability: InStock
Author: Nham Vu

Enter outer side, wall thickness, and length to get the exact weight of a stainless steel square hollow tube.

Tube Dimensions

Outer Side Length (mm)

Wall Thickness (mm)

Length (m)

Stainless Steel Grade

Enter tube dimensions and click Calculate.

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Summary

Enter outer side, wall thickness, and length to get the exact weight of a stainless steel square hollow tube.

How it works

Enter the outer side length of the square tube in millimeters.
Enter the wall thickness in millimeters (must be less than half the outer side).
Enter the tube length in meters.
Select the stainless steel grade to use the correct density.
Click Calculate to see the total weight in kg and lb, plus the linear mass in kg/m.

Use cases

Estimate material weight for structural fabrication projects.
Calculate freight and shipping weight for square tube orders.
Compare weight of different wall thicknesses for design optimization.
Verify supplier weight declarations against standard formulas.
Plan load-bearing capacity for frames and supports.
Generate quick BOM weight entries for engineering drawings.

Frequently Asked Questions

Related tools

Stainless Steel Round Tube Weight Stainless Steel Tube Weight Stainless Steel Square Bar Weight

Last updated: 2026-05-23 · Reviewed by Nham Vu