What formula is used?

Cross-sectional area = Side² − (Side − 2 × Wall)². Weight = Area × Length × Density, where all dimensions are in meters and density is 2700 kg/m³ (aluminum). The inner side equals the outer side minus twice the wall thickness.

What aluminum density does this calculator use?

A density of 2700 kg/m³ is used, which is the standard value for common aluminum alloys including 6061, 6063, and 1100. High-strength alloys such as 7075 (2810 kg/m³) will differ slightly.

What is the difference between side size and wall thickness?

Side size is the outer dimension of one side of the square tube. Wall thickness is how thick the tube wall is. The inner side equals Side minus twice the wall thickness. The calculator shows an error if the wall is too thick for the given side size.

Which units are supported?

Side size and wall thickness accept mm, cm, or inches. Length accepts mm, cm, m, inches, or feet. All values are converted to meters before the calculation runs.

Why must the side size be greater than 2 × wall thickness?

If the wall thickness is equal to or greater than half the side size, the inner dimension would be zero or negative, which is physically impossible for a hollow tube. The calculator validates this and shows an error.

Aluminum Square Tube Weight Calculator

Name: Aluminum Square Tube Weight Calculator
Availability: InStock
Author: Nham Vu

Enter side size, wall thickness, and length to get the weight of an aluminum square tube in kg and lb instantly.

Tube Dimensions

Outer Side Size

Wall Thickness

Length

Formula Reference

W = (S² − (S − 2t)²) × L × ρ

Where S = outer side size (m), t = wall thickness (m), L = length (m), ρ = 2700 kg/m³ (aluminum density), W = weight (kg).

Enter tube dimensions on the left and click Calculate.

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Summary

Enter side size, wall thickness, and length to get the weight of an aluminum square tube in kg and lb instantly.

How it works

Enter the outer side size of the square tube and choose a unit (mm, cm, in).
Enter the wall thickness and choose a unit (mm, cm, in).
Enter the tube length and choose a unit (mm, cm, m, in, ft).
Click Calculate — the inner side is derived automatically as Inner = Side − 2 × Wall.
Weight is displayed in kilograms and pounds using the standard aluminum density of 2700 kg/m³.

Use cases

Estimating material weight for aluminum square tube framing and structural projects.
Calculating shipping and freight weight for square aluminum tube orders.
Preparing a bill of materials for fabrication or purchasing.
Comparing wall thicknesses to balance strength and weight.
Verifying load and handling requirements before installation.
Quick field estimation of square tube weight without manual calculation.

Frequently Asked Questions

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Aluminum Round Tube Weight Aluminum Tube Weight Aluminum Square Bar Weight

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