Engineering & Material Weight

Square Tube Weight Calculator

Calculate the weight of square or rectangular steel tube per metre and total length.

Enter the outer dimensions and wall thickness of your square or rectangular steel tube to calculate its weight per metre and total weight for any given length.

Enter a valid dimension.
Enter a valid dimension.
Enter a valid thickness.
Enter a valid length.

Weight per Metre

—

Total Weight

—

How to Use This Tool

  1. Enter both outer side dimensions (equal for square tube, different for rectangular tube) in mm.
  2. Enter the wall thickness in mm.
  3. Enter the length in metres, then calculate.

Square/Rectangular Tube Weight Formula

The weight of a square or rectangular hollow steel section is calculated from its cross-sectional steel area multiplied by the density of steel:

W (kg/m) = 2 × t × (A + B − 2t) × 0.00785

Where A and B are the outer side dimensions (mm), t is the wall thickness (mm), and 0.00785 is the density of steel (7.85 g/cm³) converted for this unit combination.

Why This Matters

Square and rectangular hollow sections are widely used in structural fabrication, furniture frames, and railings because of their strength-to-weight efficiency. Knowing exact weight helps with material costing, transport planning, and structural load calculations.

For Square Tubes

Simply enter the same value for both Side A and Side B to calculate a true square tube.

Frequently Asked Questions

What's the difference between square and rectangular tube in this calculator?

Enter the same value for both sides for a square tube, or different values for a rectangular tube — the same formula applies to both.

Does this account for corner radius?

No, this uses the standard simplified formula which treats corners as sharp for estimation purposes. Actual tube has rounded corners, causing a small overestimate versus exact mill weight.

This calculator is provided for general informational and estimation purposes only. Results should not be treated as professional financial, tax, legal, medical, or engineering advice. Always verify critical calculations with a qualified professional or official source before making decisions.