What density does this calculator use?

It uses 2.70 g/cm³, which is the standard density for common aluminum alloys (6061, 6063, 5052, etc.). Some specialty alloys differ slightly, but 2.70 is accurate for most structural flat bar applications.

Can I use imperial units?

Yes. Switch to Imperial mode and enter width and thickness in inches, and length in feet. The calculator converts internally and outputs weight in both lb and kg.

What is the weight formula for a flat bar?

Weight = Width × Thickness × Length × Density. In metric: (mm × mm × mm) / 1,000,000 × 2.70 gives weight in kg. All dimensions must be in consistent units before multiplying.

Does alloy grade affect the result?

Minor alloy variations change density by less than 1–2%. For example, 2024 alloy is about 2.78 g/cm³ and 7075 is about 2.81 g/cm³. For most practical purposes, 2.70 g/cm³ is a safe estimate.

How do I calculate weight for multiple bars?

Enter the single-bar dimensions and multiply the result by the quantity. A "Quantity" field is provided to do this automatically.

Aluminum Flat Bar Weight Calculator

Name: Aluminum Flat Bar Weight Calculator
Availability: InStock
Author: Nham Vu

Enter width, thickness, and length of an aluminum flat bar to instantly calculate its weight using the standard density of 2.70 g/cm³.

Bar Dimensions

Unit System

Width (mm)

Thickness (mm)

Length (m)

Quantity (bars)

Enter dimensions and press Calculate to see weight.

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Summary

Enter width, thickness, and length of an aluminum flat bar to instantly calculate its weight using the standard density of 2.70 g/cm³.

How it works

Enter the flat bar width in millimeters or inches.
Enter the flat bar thickness in millimeters or inches.
Enter the total length in meters, millimeters, or feet.
Select your preferred unit system (metric or imperial).
The calculator multiplies Width × Thickness × Length × Density (2.70 g/cm³) to give weight in kg and lb.

Use cases

Estimate material weight before ordering aluminum stock.
Calculate dead load contribution of structural flat bars.
Compare weight across different flat bar sizes for a design.
Verify shipping weight for freight cost estimation.
Check weight budget when designing lightweight assemblies.
Quick sanity-check during fabrication planning.

Frequently Asked Questions

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