What formula is used to calculate aluminum round bar weight?

The formula is: Weight = (π ÷ 4) × Diameter² × Length × Density. The diameter and length are converted to meters, multiplied to get volume (m³), then multiplied by the alloy density (kg/m³) to get weight in kilograms.

What is the density of aluminum?

Pure aluminum has a density of about 2700 kg/m³ (0.0975 lb/in³). Common alloys vary slightly: 6061 is 2700 kg/m³, 7075 is 2810 kg/m³, and 2024 is 2780 kg/m³. This calculator uses the precise density for each alloy.

Does this work for both metric and imperial units?

Yes. Diameter can be entered in mm, cm, or inches. Length can be entered in meters, mm, feet, or inches. All values are converted internally before calculation.

Can I calculate the total weight for multiple bars?

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

What is the difference between 6061 and 6063 aluminum?

6061 and 6063 have the same density (2700 kg/m³) so they weigh identically. The difference lies in mechanical properties — 6061 has higher strength, while 6063 offers better surface finish and is commonly used for extrusions.

Why is 7075 aluminum heavier than 6061?

7075 alloy contains a higher proportion of zinc and other elements, raising its density to about 2810 kg/m³ versus 2700 kg/m³ for 6061. This extra density is a trade-off for its significantly higher tensile strength.

Aluminum Round Bar Weight Calculator

Enter diameter, length, and aluminum alloy to instantly calculate round bar weight in kg and lbs.

Bar Dimensions

Diameter

Length

Aluminum Alloy

Quantity (bars)

Formula Reference

W = (π / 4) × D² × L × ρ

Where D = diameter (m), L = 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 diameter, length, and aluminum alloy to instantly calculate round bar weight in kg and lbs.

How it works

Enter the bar diameter 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 = (π/4) × D² × L × ρ and shows weight in kg and lbs.
Click Copy to save the result to your clipboard.

Use cases

Estimating aluminum material weight for structural and aerospace projects.
Calculating freight and shipping weight for aluminum bar orders.
Comparing alloy weights to optimize product design for weight savings.
Preparing bill of materials (BOM) for CNC machining and fabrication.
Verifying load limits on lifting and handling equipment.
Cost estimation for aluminum stock purchases by weight.
Material planning for extrusion and forging operations.

Frequently Asked Questions

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