How to Use the Metal Weight Calculator?
Using this metal weight calculator is straightforward. Select the alloy, choose the shape, enter the dimensions, specify the number of pieces, and optionally add a price per unit weight to get cost estimates. The result will show you the weight per piece and total weight in both metric and imperial units.
How to Calculate Metal Weight?
Metal weight is calculated using a simple formula: Weight = Volume × Density × Quantity. The volume depends on the shape of the metal element, and the density is specific to the alloy type. Our calculator handles 6 shapes and 22 metals and alloys.
Volume Formulas by Shape
- Rectangular Bar / Sheet: Volume = Length × Width × Thickness
- Round Bar / Rod: Volume = π × (Diameter / 2)² × Length
- Hollow Tube / Pipe: Volume = π × [(OD/2)² − (ID/2)²] × Length
- Sphere / Ball: Volume = (4/3) × π × (Diameter / 2)³
- Ring (Torus): Volume = 2π² × R × r² (R = major radius, r = tube radius)
- Hexagonal Bar: Volume = (√3 / 2) × A² × Length (A = across-flats size)
Metal Weight Chart
The densities used in this calculator:
| Metal / Alloy | Density (g/cm³) | Density (lb/in³) |
|---|---|---|
| Carbon Steel | 7.85 | 0.2836 |
| Stainless Steel 304 | 8.00 | 0.2890 |
| Stainless Steel 316 | 8.00 | 0.2890 |
| Cast Iron | 7.20 | 0.2601 |
| Wrought Iron | 7.75 | 0.2800 |
| Aluminum 1100 | 2.71 | 0.0979 |
| Aluminum 6061 | 2.70 | 0.0975 |
| Aluminum 7075 | 2.81 | 0.1015 |
| Copper | 8.96 | 0.3236 |
| Brass | 8.50 | 0.3070 |
| Bronze | 8.80 | 0.3179 |
| Titanium | 4.51 | 0.1629 |
| Lead | 11.34 | 0.4097 |
| Zinc | 7.13 | 0.2576 |
| Nickel | 8.90 | 0.3215 |
| Magnesium | 1.74 | 0.0629 |
| Chromium | 7.19 | 0.2597 |
| Gold | 19.30 | 0.6974 |
| Silver | 10.49 | 0.3790 |
| Platinum | 21.45 | 0.7751 |
| Manganese | 7.47 | 0.2699 |
| Beryllium | 1.85 | 0.0668 |
Metals in Construction — Which Are the Most Popular?
Carbon Steel is the most widely used structural metal in construction, used for beams, columns, rebar, and plates. Its high strength-to-cost ratio makes it the default choice for most structural applications.
Aluminum is preferred when weight reduction is critical. It is commonly used in curtain walls, roofing panels, window frames, and structural components where corrosion resistance is important.
Stainless Steel combines strength and corrosion resistance. It is used for cladding, handrails, fasteners, and architectural elements exposed to harsh environments or requiring a polished appearance.
Copper is used primarily for roofing, gutters, and electrical wiring. Its antimicrobial properties also make it suitable for plumbing systems.
Cast Iron is used for pipes, columns, and decorative architectural elements. Modern construction largely replaced cast iron structural columns with steel, but it remains popular for pipes and specialty applications.
FAQs
What unit system should I use?
Choose Metric (mm / kg) if you work with millimeters and kilograms, or Imperial (in / lb) if you work with inches and pounds. The calculator shows results in both systems regardless of your selection.
How accurate is the metal weight calculator?
The accuracy depends on the accuracy of the dimensions you enter and the density of the specific alloy batch. The densities used are typical values; actual densities may vary slightly (±1–2%) depending on the manufacturer and heat treatment.
What is the "across flats" size for a hexagonal bar?
The across-flats (AF) size is the distance between two parallel flat faces of the hexagonal cross-section. This is also sometimes called the "wrench size" or "key width." It is the most common way hexagonal bars are specified in industry.
How do I calculate the weight of a tube or pipe?
Select the "Hollow Tube / Pipe" shape. Enter the outer diameter (OD) and wall thickness. The inner diameter is calculated automatically as OD − (2 × wall thickness). Then enter the length and the calculator will compute the weight.
Can I use this for precious metals like gold and silver?
Yes! Select Gold (19.30 g/cm³) or Silver (10.49 g/cm³) from the precious metals group and enter your dimensions. The cost estimation feature is especially useful for precious metal calculations — enter the spot price per kg or per troy oz (1 troy oz = 31.10 g, so divide by 0.0311 to convert to per-kg price).
What if my material is not in the list?
Select "Custom Material" from the dropdown and enter the density in g/cm³ manually. You can find density values for most materials in engineering reference books, material datasheets, or online databases.