Steel Weight Calculator
Enter Steel Dimensions
Select a shape, enter dimensions (in mm for metric, or inches for imperial), and the weight will appear here instantly.
How to Use the Steel Weight Calculator
Select a Shape and Material
Choose your steel section type from the shape dropdown — options range from simple round and square bars to pipes, I-beams, angles, and standard IPE/HEA/HEB/W profiles. Then pick the material (carbon steel, stainless steel, aluminum, or any of 12 presets) or enter a custom density in kg/m³. The unit toggle at the top right lets you switch between metric (mm, kg) and imperial (inches, lbs) at any time.
Enter Dimensions
Fill in the dimension fields that appear for your selected shape. For a round bar, enter the diameter and length. For a pipe, enter the outer diameter and wall thickness. For an I-beam or channel, enter the overall height, flange width, flange thickness, and web thickness. For standard profiles (IPE, HEA, HEB, W-shapes), simply choose the series and size designation — dimensions are pre-loaded automatically. All metric dimensions should be in millimetres; length for standard profiles can be in metres.
Set Quantity and Optional Price
Enter the number of identical pieces in the Quantity field. To get a material cost estimate, enter a price per kilogram in the Price/kg field. You can add multiple items using the Add Item button to build a complete bill of materials — each item can have a different shape, material, and quantity. Label each item with a description for easy identification in the results.
Review Results and Export
The results panel shows the total weight in kilograms, pounds, and metric tonnes simultaneously. A horizontal bar chart displays each item's proportional weight contribution. The unit weight (kg/m) for each section is shown alongside the total. When done, click Export CSV to download the full bill of materials as a spreadsheet, or Print Results to generate a print-friendly summary for your project file.
Frequently Asked Questions
What density does the calculator use for carbon steel?
The calculator uses 7,850 kg/m³ (0.2836 lbs/in³) for carbon steel and mild steel, which is the universally accepted standard density used in steel industry weight tables (EN 10210, ASTM A6, BS 4) and all major structural design standards. This value applies to common structural grades including A36, S235, S275, and S355. Stainless steel 304/316 uses 7,930 kg/m³, and other materials use their own published densities. If you are working with a specific alloy not in the presets, you can select Custom and enter the exact density from the material data sheet.
How accurate are the calculated weights?
The calculator produces theoretical weights based on nominal (published) dimensions and standard density values. Actual delivered steel typically differs from theoretical weight by ±2.5%, which is within the mass tolerance permitted by structural steel standards such as ASTM A6/A6M and EN 10034. Additional sources of variation include rolling tolerances, surface treatments (galvanizing or painting add mass), alloy composition variation within a grade, and the simplified geometry used for internal radii of angles and channels. For structural design calculations and load analysis, always use verified section properties from the relevant standard rather than this calculator alone.
What is weight per meter and why does it matter?
Weight per meter (kg/m) — also written as linear density or unit mass — is the mass of a one-metre length of a given section. It is the number you will see in steel section tables and on mill certificates. For example, an IPE 200 beam weighs 22.4 kg/m. This value is essential because it lets you quickly calculate total weight for any length: multiply kg/m by the number of metres. It also allows you to verify that the steel delivered matches the section you ordered — if the theoretical kg/m from the section table does not match the weight-to-length ratio on the delivery note, a wrong section size may have been shipped.
How do I calculate the weight of a round steel pipe?
For a round pipe or hollow circular section, the wall thickness is subtracted from the outer diameter to obtain the inner diameter: ID = OD − 2 × Wall_Thickness. The cross-sectional area of metal is then the difference between the two circles: Area = π/4 × (OD² − ID²). Multiplied by the length and the material density, this gives the total weight. In the calculator, select Round Pipe, then enter the outer diameter, wall thickness, and length. Always enter the wall thickness rather than the inner diameter to minimise input errors. For very thin-walled precision tubing, minor variations in wall thickness have a proportionally large effect on calculated weight.
What is the difference between IPE, HEA, and HEB beams?
All three are European standard wide-flange I-section beams but differ in the ratio of flange width to beam height. IPE beams (Iprofilo Europeo) are narrow-flange beams with a relatively small flange width compared to the height, making them efficient in bending about the strong axis. HEA (also called HE-A or European I-beam light series) beams have a wider flange and are more suitable for combined bending and axial load. HEB (normal series) beams have thicker flanges and webs than HEA of the same nominal height, making them stiffer and heavier. For the same designation number, weight order is IPE < HEA < HEB. The number in the designation refers to the nominal height in millimetres (e.g., IPE 200 is approximately 200 mm tall).
Can I use this calculator for non-steel materials like aluminum or copper?
Yes. The same cross-section volume formulas apply to any isotropic metal. The calculator includes pre-loaded density values for twelve common metals including aluminum (2,700 kg/m³), copper (8,930 kg/m³), brass (8,500 kg/m³), bronze (8,700 kg/m³), titanium (4,500 kg/m³), and others. Select the appropriate material from the dropdown and the density is applied automatically. You can also enter any custom density in kg/m³ using the Custom option, which accommodates exotic alloys, composites, or materials not in the preset list. The output units (kg, lbs, tonnes) remain the same regardless of material.