What is the density of lead used in this calculator?

Pure lead has a density of 11,340 kg/m³ (0.4097 lb/in³ or 708.5 lb/ft³). This is the standard value used in engineering references and is appropriate for commercially pure lead (Pb 99.9%). Lead alloys such as antimonial lead or Pb-Sn solder have slightly different densities.

What formula is used to calculate lead round bar weight?

The formula is: Weight = (π ÷ 4) × Diameter² × Length × Density. Diameter and length are converted to meters, giving volume in m³, which is then multiplied by the lead density (11,340 kg/m³) to yield weight in kilograms.

Does this calculator support 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 to meters before the calculation is performed.

Can I calculate the total weight for multiple bars?

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

Why is lead so much heavier than steel or aluminum?

Lead has a density of 11,340 kg/m³, compared to 7,850 kg/m³ for steel and 2,700 kg/m³ for aluminum. A lead bar is therefore about 1.45× heavier than the same size steel bar and roughly 4.2× heavier than the equivalent aluminum bar.

What are common applications for lead round bars?

Lead round bars are used for radiation shielding (X-ray and gamma shielding rooms), counterweights, ballast weights in ships and aircraft, noise and vibration damping pads, and as feedstock for casting and machining lead components.

Lead Round Bar Weight Calculator

Name: Lead Round Bar Weight Calculator
Availability: InStock
Author: Nham Vu

Enter diameter and length of a lead round bar to instantly calculate its weight in kg and lb.

Bar Dimensions

Diameter

Length

Quantity (bars)

Formula Reference

W = (π / 4) × D² × L × ρ

Where D = diameter (m), L = length (m), ρ = 11,340 kg/m³ (lead density), W = weight (kg).

Lead Density Reference

Property	Value
Density	11,340 kg/m³
Density	0.4097 lb/in³
Density	708.5 lb/ft³
Melting Point	327.5 °C (621.5 °F)
Atomic Number	82 (Pb)

Enter dimensions on the left and click Calculate.

Lead vs. Common Metals (Same Volume)

Metal	Density (kg/m³)	vs. Lead
Lead	11,340	1.00×
Copper	8,960	0.79×
Steel	7,850	0.69×
Cast Iron	7,200	0.63×
Aluminum	2,700	0.24×

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Summary

Enter diameter and length of a lead round bar to instantly calculate its weight in kg and lb.

How it works

Enter the bar diameter in millimeters, centimeters, or inches.
Enter the bar length in meters, millimeters, feet, or inches.
Optionally adjust the quantity for multiple bars.
Click Calculate Weight to apply the formula W = (π/4) × D² × L × ρ.
Results display in kg and lb, with a full breakdown of dimensions and volume.
Click Copy to copy the result to your clipboard.

Use cases

Estimating lead bar weight for radiation shielding panels and enclosures.
Calculating freight and shipping weight for lead bar orders.
Sizing lead counterweights for industrial machinery and cranes.
Planning ballast weight for marine vessels and submarines.
Verifying load limits on shelving, racks, and transport vehicles.
Material cost estimation for lead casting and machining projects.
Comparing weight of different lead bar dimensions during design.
Preparing bill of materials for lead-acid battery grid fabrication.

Frequently Asked Questions

Last updated: 2026-06-10 · Reviewed by Nham Vu