Round Bar Weight Calculator

Calculate the exact weight of a round bar or metal rod in seconds. Perfect for engineering, fabrication, and construction projects, this tool uses the material's density and your dimensions to provide an accurate weight estimate. Simply enter the diameter, length, and choose from a list of common materials like steel or aluminum.

Explore more tools on free calculators on CalculatorBolt.

Calculator

Weight Results

Total Weight

6.17 kg

Total Weight

13.61 lbs

Volume

0.000785 m³

Input Summary

  • Diameter: 10 mm
  • Length: 1000 mm
  • Material: Mild Steel

Calculation Method

Weight = Volume × Density

Volume = π × (D/2)² × L

Material Density (kg/m³)
Mild Steel
Stainless Steel (304)
Aluminum

How it works

The calculator uses the fundamental physics formula: Weight = Volume × Density. The volume of a cylindrical round bar is calculated as π × (Diameter/2)² × Length. By selecting a material, you provide its standard density, allowing us to compute the final weight.

Inputs explained

  • Diameter: The distance across the round bar's circular face.
  • Length: The length of the bar.
  • Material: The substance the bar is made of. This determines its density. If your material isn't listed, select 'Custom Material' and enter its density.

Example

Let's find the weight of a standard Mild Steel bar that is 20 mm in diameter and 1 meter long. The calculator determines its volume and, using the density of Mild Steel (7850 kg/m³), provides a weight of approximately 2.47 kg (or 5.44 lbs).

Tips & notes

  • The calculated weight is an estimate. Actual weight can vary due to manufacturing tolerances, alloys, and surface finishes.
  • Always use consistent units when performing manual calculations.
  • The 'Custom Material' option is useful for proprietary alloys or plastics not in the standard list.

FAQs

To manually calculate the weight of a round bar, use the formula: Weight = Volume × Density. First, calculate the volume using Volume = π × (Diameter/2)² × Length. Then multiply by the material's density in kg/m³.

The density of stainless steel (304) is approximately 8000 kg/m³. Different grades of stainless steel may have slightly different densities.

Yes, you can calculate the weight of any cylindrical rod by selecting 'Custom Material' and entering the appropriate density value for your material in kg/m³.

The calculator supports millimeters (mm), centimeters (cm), meters (m), inches (in), and feet (ft) for both diameter and length measurements.

In everyday usage, weight and mass are often used interchangeably. Technically, mass is the amount of matter, while weight is the force exerted by gravity on that mass. For this calculator, we're calculating mass, but referring to it as weight for convenience.

Disclaimer

This calculator provides an estimated weight based on standard material densities and geometric formulas. Actual weights may vary. For critical applications, always verify the weight of the physical material.

Related Calculators

About This Tool

The Round Bar Weight Calculator helps engineers, fabricators, and DIY enthusiasts quickly determine the weight of cylindrical metal rods. Reviewed by Engineering Editor.