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 8500 kg/m³ (brass). The inner side equals the outer side minus twice the wall thickness.

What brass density does this calculator use?

A density of 8500 kg/m³ is used, which is the standard value for common brass alloys including C260 (cartridge brass) and C360 (free-machining brass). Actual density may vary slightly (8400–8700 kg/m³) depending on the specific alloy composition.

What is the difference between outer side size and wall thickness?

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

Which units are supported?

Outer 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 outer side size be greater than 2 × wall thickness?

If the wall thickness is equal to or greater than half the outer 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.

How does brass compare to aluminum in weight?

Brass is roughly 3× heavier than aluminum for the same geometry. Brass density is approximately 8500 kg/m³ versus 2700 kg/m³ for aluminum. This higher density gives brass excellent vibration damping and acoustic properties but increases structural weight significantly.

Brass Square Tube Weight Calculator

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

Enter outer side size, wall thickness, and length to get the weight of a brass 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 = 8500 kg/m³ (brass density), W = weight (kg).

Enter tube dimensions on the left and click Calculate.

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Summary

Enter outer side size, wall thickness, and length to get the weight of a brass 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 brass density of 8500 kg/m³.

Use cases

Estimating material weight for brass square tube framing and decorative projects.
Calculating shipping and freight weight for square brass tube orders.
Preparing a bill of materials for fabrication or purchasing.
Comparing wall thicknesses to balance strength and weight for a brass assembly.
Verifying load and handling requirements before installation of brass components.
Quick field estimation of brass square tube weight without manual calculation.
Plumbing, architectural, and electronics projects using brass hollow sections.

Frequently Asked Questions

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