Engineering calculators

Metal Weight Calculator

Updated Sep 1, 2026 By Jehan Wadia
Rate Formulas
Material Selection
Imperial
0.2836 lb/in³
Metric
7.85 g/cm³
Shape Selection
Dimensions
Quantity
Total weight is multiplied by this count.
Enter a whole number of 1 or more.

Total Weight (1 piece)
0 lb
0 kg
Weight Per Piece
0 lb
Weight Per Piece (kg)
0 kg
Volume Per Piece
0 in³
0 cm³
Total Volume
0 in³
0 cm³
Calculation Summary
Weight Across Quantities

Introduction

The Metal Weight Calculator helps you find the weight of a metal part fast. You just pick a metal, choose a shape, and type in the size. The tool calculates the weight and shows it in pounds and kilograms.

You can use it for round bars, square bars, hex bars, flat bars, sheets, pipes, discs, rings, and more. It works with many metals like steel, aluminum, copper, brass, and titanium. Each metal has its own density, so the answer fits the metal you choose.

This is handy for planning a job, ordering stock, or checking shipping weight. You can enter sizes in inches, feet, millimeters, or other units. You can also set how many pieces you need, and the tool gives you the total weight and volume right away.

How to use our Metal Weight Calculator

Pick your metal, shape, and sizes, and the calculator shows you the weight per piece and the total weight in pounds and kilograms.

Choose your Material / Alloy from the list. This sets the density the tool uses to find the weight.

Pick your Metal Shape, like a round bar, sheet, tube, or ring. The picture changes to match your choice.

Type in the Dimensions for your shape, such as diameter, length, width, or thickness. Use the box next to each one to set the unit, like inches, feet, or millimeters.

Enter the Number of Pieces you have. The tool multiplies the weight of one piece by this count to get the total weight.

Click Calculate to see your results, or click Reset to start over.

Metal Weight Calculator

Metal weight tells you how heavy a piece of metal is before you cut, ship, or buy it. Knowing the weight helps you plan jobs, set prices, and pick the right tools to lift and move parts safely.

How Metal Weight Works

The weight of any metal part comes from two things: its volume (how much space it takes up) and its density (how much one unit of that metal weighs). You find the volume from the shape and size of the part. Then you multiply the volume by the density to get the weight.

Why Density Matters

Each metal has its own density. For example, lead is very heavy, while aluminum and magnesium are light. Two parts can be the same size but weigh very different amounts because they are made from different metals. That is why you must pick the right material first.

Common Metal Shapes

Metal comes in many forms, and each one has its own way to find volume:

  • Round Bar: a solid rod, like a pole.
  • Square and Hex Bars: bars with flat sides.
  • Flat Bar and Sheet: thin, wide pieces.
  • Tube or Pipe: a round bar with a hollow center.
  • Disc and Ring: flat circles, with the ring having a hole in the middle.

Units

You can enter sizes in inches, feet, yards, millimeters, centimeters, or meters. The weight is shown in both pounds (lb) and kilograms (kg) so it works for any job, anywhere.

Where This Helps

Shops, builders, and buyers use metal weight every day. It helps you guess shipping costs, check how much a part will cost by the pound, and make sure a load is safe to lift. A quick, correct weight saves time and money.


Formulas used

Round Bar Volume
V = \pi \left(\frac{d}{2}\right)^2 L
Square Bar Volume
V = s^2 \, L
Hexagonal Bar Volume
V = \frac{2}{\sqrt{3}} \, w^2 \, L
Octagonal Bar Volume
V = 2\left(\sqrt{2} - 1\right) w^2 \, L
Flat Bar / Sheet Volume
V = W \times T \times L
Tube Volume
V = \pi \left[\left(\frac{d_o}{2}\right)^2 - \left(\frac{d_o - 2t_w}{2}\right)^2\right] L
Ring / Disc Volume
V = \pi \left[\left(\frac{d_o}{2}\right)^2 - \left(\frac{d_i}{2}\right)^2\right] T
Weight Calculation
W_{\text{total}} = V \times \rho \times n

Frequently asked questions

Why do I need to pick a material first?

Each metal weighs a different amount for the same size. Lead is heavy, and aluminum is light. The calculator uses the density of your chosen metal to give the right weight. If you skip this step, the answer will not match your real part.

How do I find the weight of a hollow pipe?

Choose the Tubular (Pipe) shape. Type in the outer diameter, the wall thickness, and the length. The tool takes out the hollow center, so you only get the weight of the metal walls.

What is the difference between a disc and a ring?

A disc is a solid flat circle. A ring is a flat circle with a hole in the middle. For a ring, you enter both the outer and inner diameter, and the tool removes the hole from the weight.

How do I get the total weight for many pieces?

Type the count in the Number of Pieces box. The tool finds the weight of one piece, then multiplies it by your count. You see both the weight per piece and the total weight.

Is the steel weight close to real-world steel?

Yes. The tool uses a density of 0.2836 lb/in³ for generic steel, which is about 7.85 g/cm³. This is a common value for mild steel. Small changes in alloy can shift the real weight a little.

Why is my actual part a bit heavier or lighter than the result?

The tool uses an exact shape and a set density. Real parts may have rounded edges, holes, coatings, or small size changes. These small things make the real weight differ a little from the math.

What does the volume number mean?

Volume is how much space the metal takes up, shown in cubic inches. It does not depend on the metal type. The tool uses this volume with density to find the weight.

Does the width across flats matter for hex bars?

Yes. For hex and octagon bars, you enter the width across flats, which is the distance between two flat sides. This is not the same as corner to corner, so measure flat to flat for the right answer.