What formula is used to calculate aluminum square bar weight?

The formula is: Weight = Side² × Length × Density. The side length and bar length are converted to meters, side is squared to get the cross-sectional area (m²), multiplied by length to get volume (m³), then multiplied by the alloy density (kg/m³) to obtain weight in kilograms.

What is the standard density of aluminum?

Pure aluminum and common structural alloys such as 6061 and 6063 have a density of 2700 kg/m³ (0.0975 lb/in³). High-strength alloys like 7075 are denser at 2810 kg/m³, while marine-grade 5052 is slightly lighter at 2680 kg/m³.

Does this calculator support metric and imperial units?

Yes. Side length can be entered in mm, cm, or inches. Bar length can be entered in meters, mm, feet, or inches. All values are converted to meters internally before calculation.

How does square bar weight compare to round bar of the same side/diameter?

A square bar is heavier than a round bar of the same nominal size. A round bar uses (π/4) ≈ 0.785 of the square cross-section area. So a 25 mm square bar weighs about 27% more than a 25 mm diameter round bar of the same length.

Can I calculate the total weight for multiple bars?

Yes. Enter the number of bars in the Quantity field and the calculator will display both the per-bar weight and the total weight for the entire batch.

Which alloy should I choose for general structural use?

6061-T6 is the most common choice for structural square bars — it offers a good balance of strength, weldability, and machinability at 2700 kg/m³. For architectural or decorative work, 6063 has the same density but a better surface finish.

Aluminum Square Bar Weight Calculator

Enter side length, bar length, and alloy grade to instantly calculate aluminum square bar weight in kg and lbs.

Bar Dimensions

Side Length

Bar Length

Aluminum Alloy

Quantity (bars)

Formula Reference

W = S² × L × ρ

Where S = side length (m), L = bar length (m), ρ = alloy density (kg/m³), W = weight (kg).

Enter dimensions on the left and click Calculate.

Aluminum Alloy Densities

Alloy	Grade / Use	kg/m³	lb/in³
1100	Pure / Chemical	2700	0.0975
2011	Free-Machining	2830	0.1022
2024	Aircraft / High Strength	2780	0.1004
3003	General Purpose	2730	0.0986
5052	Marine Grade	2680	0.0968
6061	Structural / Most Common	2700	0.0975
6063	Architectural / Extrusion	2700	0.0975
7075	Aerospace / Max Strength	2810	0.1015

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Summary

Enter side length, bar length, and alloy grade to instantly calculate aluminum square bar weight in kg and lbs.

How it works

Enter the bar side length in millimeters, inches, or centimeters.
Enter the bar length in meters, millimeters, feet, or inches.
Select the aluminum alloy grade from the dropdown.
Optionally enter a quantity for multiple bars.
The calculator applies W = Side² × L × ρ and displays weight in kg and lbs.
Click Copy to save the result to your clipboard.

Use cases

Estimating aluminum material weight for structural and fabrication projects.
Calculating freight and shipping weight for square bar stock orders.
Comparing alloy weights to optimize designs for weight savings.
Preparing bill of materials (BOM) for CNC machining and metalworking.
Verifying load limits on lifting and handling equipment.
Cost estimation for aluminum square bar purchases by weight.
Material planning for construction and manufacturing operations.
Comparing square vs. round bar weight for the same cross-section footprint.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu