What formula is used?

Weight = (π ÷ 4) × (OD² − ID²) × Length × Density, where OD is outer diameter in meters, ID is inner diameter in meters, Length is in meters, and Density is 8500 kg/m³. The result is in kilograms.

What brass density does this calculator use?

A density of 8500 kg/m³ (8.5 g/cm³) is used. This is typical for yellow brass alloys such as CZ108 (63/37), CZ120 (65/35), and cartridge brass (70/30 CuZn). Lead-free or high-zinc brass alloys may vary slightly.

Why do I enter inner diameter instead of wall thickness?

Brass tubes are often specified and sold by OD and ID dimensions on technical data sheets. Entering ID directly avoids the intermediate calculation step. If you only know wall thickness, ID = OD − 2 × wall.

Which units are supported?

Outer diameter and inner diameter 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 OD be greater than ID?

The outer diameter must exceed the inner diameter for a hollow tube to exist physically. If OD equals or is less than ID, there is no tube wall and no material to weigh.

How accurate is the result?

Accuracy depends on the actual alloy density and dimensional tolerances of the tube. The calculator uses 8500 kg/m³ as a standard brass density, which is correct for most yellow brass alloys to within 1–2%.

Brass Round Tube Weight Calculator

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

Enter outer diameter, inner diameter, and length to get the weight of a brass round tube in kg and lb instantly.

Tube Dimensions

Outer Diameter (OD)

Inner Diameter (ID)

Length

Formula Reference

W = (π / 4) × (OD² − ID²) × L × ρ

Where OD = outer diameter (m), ID = inner diameter (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 diameter, inner diameter, and length to get the weight of a brass round tube in kg and lb instantly.

How it works

Enter the outer diameter (OD) of the tube and choose a unit (mm, cm, in).
Enter the inner diameter (ID) of the tube and choose a unit (mm, cm, in).
Enter the tube length and choose a unit (mm, cm, m, in, ft).
Click Calculate — the tool validates that OD is strictly greater than ID.
Weight is displayed in kilograms and pounds using a brass density of 8500 kg/m³.

Use cases

Estimating material weight for brass tube framing and decorative structures.
Calculating shipping and freight weight for brass tubing orders.
Preparing a bill of materials for plumbing, HVAC, or instrumentation fabrication.
Comparing wall thicknesses to balance strength, weight, and cost.
Verifying load and handling requirements before installation.
Quick field estimation of brass tube weight without manual calculation.
Supporting procurement and inventory costing for machining workshops.

Frequently Asked Questions

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