Metal Weight Calculator
Calculate the weight of steel, aluminum, copper and other metals — for bars, plates, pipes, tubes and angles, from real material densities
Pick a shape and material, enter the dimensions, and get the weight in kg, g, lb and oz.
Densities are standard reference values; alloys vary by composition, so real weight can differ a little. For critical work, use the supplier's specified density.
Metal density chart & bar weights
The weight of a metal part equals its volume × the metal's density. This chart lists the density of common metals and alloys in g/cm³, kg/m³ and lb/in³, with the weight of standard steel and aluminum bars.
Common bar weights
| Material | g/cm³ | kg/m³ | lb/in³ |
|---|---|---|---|
| Steel | 7.85 | 7,850 | 0.284 |
| Stainless steel | 7.9 | 7,900 | 0.285 |
| Aluminum | 2.7 | 2,700 | 0.098 |
| Copper | 8.96 | 8,960 | 0.324 |
| Brass | 8.5 | 8,500 | 0.307 |
| Bronze | 8.8 | 8,800 | 0.318 |
| Lead | 11.34 | 11,340 | 0.41 |
| Titanium | 4.51 | 4,506 | 0.163 |
| Zinc | 7.13 | 7,135 | 0.258 |
| Nickel | 8.9 | 8,900 | 0.322 |
| Cast iron | 7.2 | 7,200 | 0.26 |
| Magnesium | 1.74 | 1,740 | 0.063 |
| Gold | 19.32 | 19,320 | 0.698 |
| Silver | 10.49 | 10,490 | 0.379 |
Densities are typical values and vary slightly with the exact alloy and temper. Density data from Engineering ToolBox.
About this calculator
This metal weight calculator works out how much a piece of metal weighs from its shape, dimensions and material. It is the tool engineers, fabricators, welders and DIY builders reach for when ordering stock, estimating shipping or balancing a structure. The idea is simple: every metal has a known density, and every standard profile has a known cross-section, so weight equals cross-sectional area times length times density. A length of steel round bar is far heavier than the same length of aluminum, and a hollow tube weighs much less than a solid bar of the same outside size. The calculator covers the most common shapes — round bar, square bar, flat/rectangular bar, hexagon bar, round pipe, square tube, plate/sheet and angle — and a wide range of materials from steel and stainless to copper, brass, titanium, even gold and silver. Enter the dimensions in millimetres, centimetres, metres, inches or feet, set how many pieces you need, and read the weight in kilograms, grams, pounds and ounces.
How to use
- 1 Choose the cross-section shape, such as round bar, plate or pipe.
- 2 Pick the material so the right density is used — steel, aluminum, copper and more.
- 3 Enter the dimensions and length in your chosen unit, plus the number of pieces.
- 4 Read the weight per piece and the total in kg, g, lb and oz, and copy any value.
How it works
The weight of a metal part is its volume multiplied by the density of the material. For a uniform profile, volume is the cross-sectional area times the length. The calculator converts every dimension to metres, computes the cross-section for the chosen shape — for example π/4 × d² for a round bar, width × thickness for a plate, or π/4 × (D² − d²) for a pipe where the inner diameter is the outer diameter minus twice the wall thickness — then multiplies by length to get the volume in cubic metres. Multiplying by the material density in kilograms per cubic metre gives the weight, which is then expressed in grams, pounds and ounces and multiplied by the quantity. Densities used here are standard reference values (for example steel ≈ 7850, aluminum ≈ 2700, copper ≈ 8960 kg/m³); real alloys vary slightly with composition and temperature.
Frequently asked questions
How do you calculate the weight of steel?
Multiply the volume of the steel by its density, which is about 7850 kg/m³. The volume depends on the shape: for a round bar it is π/4 × diameter² × length, for a plate it is width × thickness × length. For example, a steel round bar 20 mm across and 1 metre long weighs about 2.47 kg, and a steel plate 1 m × 1 m × 10 mm weighs 78.5 kg. This calculator does all of that automatically.
What density should I use for aluminum, copper or brass?
Common reference densities are about 2700 kg/m³ for aluminum, 8960 for copper, 8500 for brass, 8800 for bronze, 7900 for stainless steel and 4506 for titanium. Alloys differ a little by grade, so for precise work check the value from your supplier. The calculator already stores these standard densities for each material.
How do I find the weight of a pipe or tube?
A pipe is a hollow profile, so its cross-section is the outer area minus the inner area. For a round pipe that is π/4 × (D² − d²), where the inner diameter d equals the outer diameter D minus twice the wall thickness. Enter the outer diameter and wall thickness and the calculator handles the rest. A steel pipe of 60 mm outer diameter and 5 mm wall, 1 metre long, weighs about 6.78 kg.
Are these weights exact?
They are accurate estimates based on standard material densities and ideal geometry. Real parts vary slightly because of manufacturing tolerances, surface coatings, and the exact alloy used, which changes the density a little. For shipping estimates and design checks the result is reliable; for certified figures, use the density and tolerances specified by your supplier.
Related tools and uses
Pair this with the unit converter for any other length or weight conversion, the cooking converter for density-based kitchen measurements, and the density reference for material properties.