METALS AND ALLOYS
Metal weight calculator.
Approximate weight for round, hexagonal, square and flat bars. Choose a material group for a quick estimate, or a grade to use its typical density.
Material selection
A general estimate for this material. Selecting a grade can provide a more specific density.
Custom density
Dimensions and quantity
All dimensions are in millimetres. Decimal points and commas are accepted.
How is the weight calculated?
The section area is multiplied by density to find kg/m. Piece weight uses the entered length; total weight also includes quantity.
π × d² / 4 = section area (mm²)
Area × density / 1000 = kg/m
kg/m × length (mm) / 1000 × quantity = total kgStainless steels
- Weight per metre
- 10.053 kg/m
- Weight per piece
- 10.053 kg
- Density used
- 8 g/cm³
A theoretical estimate. Actual dimensions, tolerances and material properties can change the measured weight.
One tool for different metal weights
A stainless steel bar and an aluminium bar with the same dimensions do not weigh the same. Their volume is identical, but their densities differ. This calculator combines section dimensions, length and material density to estimate weight per metre, per piece and for the full quantity. It covers solid round, hexagonal, square and flat bars from our metal and alloy catalogue.
The material option is useful for a quick general estimate. Grade selection provides a more specific reference when you already know the alloy, such as 316L, 17-4 PH, Alloy 625 or titanium Grade 5. Where a verified grade density is unavailable, the tool clearly identifies the representative family value used instead.
Stainless steel bar weight: 304, 316L and PH grades
Stainless steel weight calculations often start with diameter and length. For a round bar, diameter determines the circular section area; length determines its volume. The density of the selected stainless grade then converts that volume into an approximate mass. Square, hexagonal and flat bars use their own section geometry.
Grades such as 304 and 316L are close in density, so equal-sized bars can have similar weights even though their corrosion performance differs. PH grades, including 17-4 PH, 15-5 PH and 13-8 Mo, have their own typical density references. Grade selection helps avoid applying one general stainless value to every alloy.
Aluminium, titanium and nickel alloy calculations
Aluminium and titanium are lighter than steel at the same volume. This difference is easy to see by keeping the dimensions unchanged and switching materials. For aluminium grades such as 6061, 6082 and 7075, or titanium Grade 2 and Grade 5, grade-specific values make the estimate more relevant than a broad material average.
Nickel and cobalt alloys also vary in density. Alloy 625, Alloy 718, Monel 400 and commercially pure nickel should not automatically share one value. The grade search accepts alloy names, EN numbers and UNS designations, so the reference can follow the material you have in mind. Weight alone does not describe strength, corrosion resistance or suitability for an application.
What the dimensions mean
All dimensions are entered in millimetres. Round bar uses diameter; square bar uses one side; flat bar uses width and thickness. A hexagonal bar uses the distance between opposite parallel faces, commonly called the across-flats size. The length field refers to one piece, while quantity gives the number of identical pieces.
For example, a square section of 10 × 10 mm and a flat section of 20 × 5 mm have the same area. With the same length and density, they therefore have the same calculated weight. Doubling a round bar’s diameter multiplies its area, and its weight at the same length, by four.
A theoretical weight, with a clear density reference
Density is shown in g/cm³. Grade references are typical manufacturer-published values rather than measurements of a particular batch. The reference condition and temperature appear when available, because values can differ with the published material condition. An optional custom density can also be used.
The result remains an estimate: actual dimensions, manufacturing tolerances and the material supplied can change the scale weight. This tool calculates solid sections only. Hollow tubes, threaded parts, flanges and fittings need different geometry and are not represented by a solid bar calculation.
Frequently asked questions
What is the difference between material and grade selection?
Material selection uses a representative group or family density. Grade selection uses the verified typical density for that grade when available. If it is unavailable, the representative value is clearly labelled.
What is the difference between total kg and kg/m?
The weight of one metre of the section is expressed in kg/m. Piece weight includes the entered length; total weight also includes quantity. For a 2-metre piece, piece weight is twice kg/m.
How much does a 316L round bar weigh?
It depends on diameter and length. As an example, a 20 mm diameter bar, 1000 mm long, with a density of 8 g/cm³ weighs approximately 2.513 kg. Changing the length or quantity changes the result proportionally.
Can I calculate aluminium and titanium bar weights?
Yes. The material choices include aluminium and titanium, and grade search includes our listed grades. All four solid section shapes can be calculated with the selected density.
How are flat bars and rectangular plates calculated?
A solid rectangular section uses width × thickness × length × density. The Flat option can represent this simple geometry, including a plain rectangular plate within the supported dimensions. Holes, cut-outs and shaped edges are not deducted.
Can I calculate pipe or tube weight here?
No. A tube requires wall thickness and the internal void to be included. The Round option represents a solid round bar and must not be used as a tube calculation.
Which dimension is used for a hexagonal bar?
Across flats: the distance between two opposite parallel faces. The calculator does not use the distance between opposite corners.
Are the results exact delivery weights?
No. They are theoretical estimates based on dimensions and density. Actual material tolerances and dimensions can change the measured weight.
Does the calculation support decimal dimensions?
Yes. Decimal points and commas are accepted, for example 12.5 or 12,5 mm. Quantity must be a positive whole number.