What formula is used to calculate brass round bar weight?

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

What is the density of brass?

Standard brass (copper-zinc alloy) has a density of approximately 8500 kg/m³ (8.5 g/cm³ or 0.307 lb/in³). The exact value varies slightly by alloy: yellow brass (C260) is about 8530 kg/m³, free-machining brass (C360) is about 8500 kg/m³, and naval brass (C464) is about 8440 kg/m³.

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 the entire batch.

How does brass weight compare to aluminum?

Brass is much denser than aluminum. At approximately 8500 kg/m³, brass is about 3.1 times heavier than aluminum (2700 kg/m³) for the same volume. This makes brass significantly heavier but also gives it superior mechanical properties for wear resistance and machinability.

Which brass alloy should I select?

C260 (Cartridge Brass) is the most common general-purpose grade. C360 (Free-Cutting Brass) is preferred for high-speed CNC machining. C464 (Naval Brass) is used in marine and corrosion-resistant applications. If unsure, use the standard 8500 kg/m³ density.

Brass Round Bar Weight Calculator

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

Bar Dimensions

Diameter

Length

Brass Alloy

Quantity (bars)

Formula Reference

W = (π / 4) × D² × L × ρ

Where D = diameter (m), L = length (m), ρ = brass density (kg/m³), W = weight (kg). Standard brass density: 8500 kg/m³ (8.5 g/cm³).

Enter dimensions on the left and click Calculate.

Brass Alloy Densities

Alloy	Grade / Use	kg/m³	lb/in³
C260	Cartridge / Yellow Brass	8530	0.308
C270	Yellow Brass	8500	0.307
C360	Free-Cutting / Machinable	8500	0.307
C464	Naval Brass / Marine	8440	0.305
C110	Electrolytic Copper	8890	0.321
C172	Beryllium Copper	8800	0.318

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Summary

Enter diameter, length, and brass 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 brass 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 brass material weight for machining and fabrication projects.
Calculating freight and shipping weight for brass bar orders.
Comparing alloy weights to optimize product design.
Preparing bill of materials (BOM) for CNC turning and milling jobs.
Verifying load limits on handling and lifting equipment.
Cost estimation for brass stock purchases by weight.
Material planning for plumbing fittings, gears, and decorative hardware.
Checking weight compliance for precision instrument components.

Frequently Asked Questions

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