Metal Weight Calculator
Choose a material and shape, enter the stock dimensions and quantity, and calculate theoretical metal weight for purchasing, handling, or freight planning. Check the entries against the drawing or supplier data before using the result.
Planning a purchase? See what to include in your enquiry
Use this checklist when asking a supplier for a quote. Mark anything you are unsure about for confirmation.
- Material
- Grade and any specified material standard.
- Dimensions
- Plate, pipe or bar; dimensions and units.
- Quantity
- Number of pieces, length per piece or required weight.
- Tolerances
- Permitted dimensional variation, if specified.
- Finish and processing
- Surface finish, delivery condition and cutting requirements.
- Delivery
- Destination and preferred arrival date.
Add any inspection-document or packaging requirements. Theoretical weight is for planning; confirm the billing basis with the supplier.
Formula
Theoretical mass = cross-sectional area × length × nominal density × quantity.
Plate and flat bar area = width × thickness; round bar area = π × diameter² / 4.
Round pipe area = π × [outside diameter² − (outside diameter − 2 × wall thickness)²] / 4.
The calculator converts all dimensions and density to coherent units before multiplying; the displayed kg/m³ density remains material- and condition-specific.
Common examples
Load a calculated example, then adjust its dimensions or quantity.
| Example | Inputs | Calculated answer | Load example |
|---|---|---|---|
| Electrical busbar purchasingC110 copper busbar, 10 × 100 mmFor a busbar order, calculate the metal-only mass of each cut length, then confirm the conductivity grade, edge condition, and finished length. | Material or alloy: Copper C110; Shape: Flat bar; Thickness: 10 mm; Width or side: 100 mm; Length: 3 m; Quantity: 12 | Total theoretical weight320.76 kg | |
| Machine-shop stock planningC360 brass round bar, 1.5 in diameterBefore ordering C360 bar, include the supplier's saw allowance in the stock length so the estimate reflects what the shop will actually receive. | Material or alloy: Brass C360; Shape: Round bar; Diameter: 1.5 in; Length: 12 ft; Quantity: 6 | Total theoretical weight212.669993 kg | |
| Stainless steel 304Fabrication material takeoff304 stainless plate, 6 × 1500 × 3000 mmA fabrication takeoff can use the nominal plate size, while finish, thickness tolerance, protective film, and cutouts remain separate from theoretical weight. | Material or alloy: Stainless steel 304; Shape: Plate or sheet; Thickness: 6 mm; Width or side: 1500 mm; Length: 3 m; Quantity: 4 | Total theoretical weight853.2 kg | |
| Rack and bundle planningCarbon steel flat bar, 4 × 0.5 inRack planning starts with the mass per stock length multiplied by the bundle count; verify the actual grade and length with the supplier. | Material or alloy: Carbon steel; Shape: Flat bar; Thickness: 0.5 in; Width or side: 4 in; Length: 20 ft; Quantity: 10 | Total theoretical weight613.531676 kg | |
| Prototype material order6061 aluminum round bar, 50 mm diameterWhen comparing 6061 aluminum with steel, use the documented density for each material instead of applying one generic metal value. | Material or alloy: Aluminum 6061; Shape: Round bar; Diameter: 50 mm; Length: 3 m; Quantity: 8 | Total theoretical weight127.234502 kg | |
| Freight estimateC110 copper square bar, 1 inFreight planning should add pallets, wrapping, and protection after calculating the metal-only mass of the copper square bar. | Material or alloy: Copper C110; Shape: Square bar; Width or side: 1 in; Length: 10 ft; Quantity: 5 | Total theoretical weight87.605244 kg | |
| Bearing-plate blankC932 bronze plate, 20 × 300 × 600 mmBronze blanks are often ordered oversize for machining, so enter the purchased dimensions and confirm the C932 designation on the order. | Material or alloy: Bronze C932; Shape: Plate or sheet; Thickness: 20 mm; Width or side: 300 mm; Length: 0.6 m; Quantity: 2 | Total theoretical weight64.152 kg | |
| Stainless steel 316Replacement spool planning316 stainless pipe from measured OD and wallReplacement pipe weight depends on actual outside diameter and wall thickness; nominal pipe size alone is not an outside-diameter measurement. | Material or alloy: Stainless steel 316; Shape: Round pipe; Outside diameter: 4.5 in; Wall thickness: 0.237 in; Length: 20 ft; Quantity: 3 | Total theoretical weight300.720298 kg | |
| High-value stock checkGrade 2 titanium round bar, 30 mmReceiving teams can compare theoretical titanium stock mass with the scale reading, but custody and settlement should use the agreed commercial weight. | Material or alloy: Titanium Grade 2; Shape: Round bar; Diameter: 30 mm; Length: 2 m; Quantity: 4 | Total theoretical weight25.503449 kg | |
| Nickel Alloy 625Special-alloy quote reviewNickel alloy plate, 0.375 × 24 × 48 inQuote checks are meaningful only when alloy density, nominal dimensions, piece count, and unit system match on both sides. | Material or alloy: Nickel Alloy 625; Shape: Plate or sheet; Thickness: 0.375 in; Width or side: 24 in; Length: 4 ft; Quantity: 2 | Total theoretical weight119.497093 kg |
Frequently asked questions
Is calculated metal weight the same as shipping weight?
No. The result covers the modeled metal only. Packaging, pallets, dunnage, moisture, fasteners, and other shipment items must be added separately.
Which density should I use for an alloy?
Use a source-backed value for the exact alloy and condition when available. A broad material-family value is useful for screening, but it should not replace supplier or specification data.
Can I use drawing dimensions for purchasing?
Yes for an initial theoretical estimate, provided you distinguish finished dimensions from stock dimensions and include machining, cutting, and tolerance allowances separately.
Why can delivered metal differ from the estimate?
Nominal density and dimensions are not exact delivered values. Chemistry, tolerance, coating, finish, fabrication, and measurement all contribute to the difference.
Sources
Circumference, Area and Volume (Opens in a new tab)
National Institute of Standards and Technology
- Supports
- Geometry or calculation formula
- Checked
NIST Guide to the SI, Appendix B.8 and footnotes (Opens in a new tab)
National Institute of Standards and Technology
- Supports
- Unit conversion
- Checked
C11000 Alloy Physical Properties (Opens in a new tab)
Copper Development Association Inc.
- Supports
- Material density
- Checked