Calculate metal weight for steel, aluminum, stainless, copper, brass, and titanium plate, sheet, bar, tube, pipe, rectangular tube, and angle stock.
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Metal weight and stock planner Estimate sheet, plate, bar, tube, pipe, rectangular tube, and angle weight from dimensions and metal density, then check per-piece weight, weight per foot, and optional material cost.
Common metal-weight examples
Shape
Total metal weight
10.2 lb
1 piece of plate / sheet in steel (carbon).
Total weight
4.63 kg
Weight per piece
10.2 lb
Weight per foot
10.2 lb/ft
Weight per metre
15.18 kg/m
Section area
3 in2
Volume per piece
36 in3
Total volume
36 in3
Density used
0.28 lb/in3 / 7,841.72 kg/m3
Planning note This is a theoretical stock weight from nominal dimensions and density. Mill tolerances, alloy grade, coatings, cutouts, welds, and kerf can move the actual scale weight.
Metal weight calculator: steel, aluminum, tube, plate, bar, and angle stock
A metal weight calculator estimates the weight of metal stock from its shape, dimensions, quantity, and alloy density. It is used in fabrication, machining, procurement, structural planning, and shipping to estimate steel weight, aluminum weight, copper weight, brass weight, stainless weight, or titanium weight before ordering or cutting material.
What this metal weight calculator estimates
The calculator supports common shop and supplier shapes: plate or sheet, round bar, square bar, round tube or pipe, rectangular tube, and angle stock. For each shape, it calculates the cross-sectional area, multiplies by length to get volume, then multiplies by the selected metal density to estimate weight.
The result is more than a single number. It reports total weight, weight per piece, weight per foot, weight per metre, volume, density used, and optional material cost. Those rows help answer practical questions such as how heavy a steel plate is, how much an aluminum tube weighs, whether a bundle will fit a handling limit, and whether a quote's weight looks plausible.
Core metal weight formulas
Every shape starts from the same base rule: weight equals volume times density. The only difference between a sheet metal weight calculator, round bar weight calculator, tube weight calculator, or angle weight calculator is the geometry used to find the cross-section.
For stock with a constant cross-section, weight per foot is especially useful. Once the calculator finds the section area and density, it can express the same part as total weight or as pounds per foot and kilograms per metre.
Weight = Cross-section area x Length x Density
The universal formula for prismatic metal stock.
Plate or sheet area = Width x Thickness
The same rectangular formula works for sheet, plate, and flat bar when length is entered separately.
Round bar area = pi x Diameter^2 / 4
Solid round rods and bars use the area of a circle.
Round tube area = pi x (OD^2 - ID^2) / 4
Hollow pipe and tube weight uses the difference between outer and inner circular areas.
Rectangular tube area = Outer width x outer height - inner width x inner height
The inner opening is derived from wall thickness.
Angle area = Leg A x thickness + Leg B x thickness - thickness^2
The overlapping corner is subtracted once so it is not counted twice.
Density assumptions by metal type
Density is the most important material input. Carbon steel is commonly estimated around 0.283 lb/in3, aluminum around 0.098 lb/in3, copper around 0.323 lb/in3, brass around 0.307 lb/in3, stainless steel around 0.289 lb/in3, and titanium around 0.163 lb/in3. Exact values vary by alloy grade and temper.
That is why the calculator exposes the density used instead of hiding it. If a mill certificate, material specification, supplier data sheet, or engineering drawing gives a better density, choose Custom and enter that value. A small density difference can become meaningful when the part is long, thick, or ordered in quantity.
Do not assume two metals with the same dimensions weigh nearly the same. A steel plate of a given size weighs roughly three times as much as a similar aluminum plate, while copper and brass are heavier than carbon steel for the same volume.
How to use the result for fabrication, quoting, and shipping
Use total weight when checking lifting, vehicle payload, storage rack capacity, shipping class, or purchase quantity. Use weight per foot when comparing supplier line items for bar, tube, pipe, or angle stock. Use cost per piece and total cost when the supplier quotes material by the pound.
For example, a 12 in by 12 in by 0.25 in carbon steel plate is 36 cubic inches. At 0.2833 lb/in3, the theoretical weight is about 10.2 lb. If three identical plates are needed, the total stock weight is about 30.6 lb before packaging, waste, or coatings.
For tube and angle, the result is a theoretical section weight based on nominal geometry. Real supplier tables may differ slightly because of wall tolerances, corner radii, seam geometry, alloy grade, and published rounding.
When a metal weight estimate is not enough
A weight calculator is not a structural design check. It does not calculate bending strength, deflection, buckling, weld capacity, lifting points, or code compliance. A tube and a solid bar can have similar weight but very different stiffness and strength behaviour.
It also does not include holes, cutouts, bevels, machining allowance, weld metal, paint, galvanizing, protective film, packaging, or kerf loss. For purchasing and shipping, add the allowances your shop or supplier normally uses.
Calculate the cross-sectional area of the metal shape, multiply by length to get volume, then multiply by density. For example, plate weight equals length x width x thickness x density.
What is the formula for steel plate weight?
Steel plate weight is length x width x thickness x steel density. With dimensions in inches and density in lb/in3, the result is pounds. A common carbon-steel planning density is about 0.283 lb/in3.
How do I calculate round bar weight?
Use round bar area = pi x diameter^2 / 4, multiply by length, then multiply by the selected metal density. The calculator also converts the same result into weight per foot.
How do I calculate tube or pipe weight?
Use the hollow circular area: pi x (outer diameter^2 - inner diameter^2) / 4. Multiply that area by tube length and density. If you only know wall thickness, subtract twice the wall thickness from the outer diameter to estimate inner diameter before calculating.
How do I estimate rectangular tube weight?
Calculate the outer rectangular area, subtract the inner opening area, multiply by length, then multiply by density. The calculator derives the inner opening from outer width, outer height, and wall thickness.
How do I calculate angle iron weight?
A practical equal or unequal angle estimate is leg A x thickness plus leg B x thickness minus thickness squared, multiplied by length and density. Supplier tables may differ slightly because real angles have corner radii and tolerances.
Why does alloy density matter?
Different metals and alloy grades have different densities. Aluminum is much lighter than steel, while copper and brass are heavier. The same dimensions can therefore produce very different weights depending on the selected material.
Are the density presets exact for every alloy?
No. They are planning values for common metal families. If the exact grade matters, use the density from the material specification, mill certificate, or supplier data sheet.
Does this calculator include holes, cutouts, or machining?
No. It assumes a full nominal shape. Subtract removed material separately for large holes, slots, bevels, or machining operations.
Does this include coatings, galvanizing, or paint?
No. The result estimates base metal weight only. Coatings, galvanizing, paint, packaging, labels, and pallets should be added separately for shipping or purchase planning.
Why might supplier weight tables differ from the calculator?
Supplier tables may include standard rounding, dimensional tolerances, corner radii, seam geometry, alloy-specific density, or nominal section data. Treat calculator output as a theoretical estimate unless your supplier confirms the same assumptions.
Can I use this as a structural design tool?
No. Weight is only one input. Structural design also depends on strength, stiffness, connection details, loading, safety factors, and applicable codes.
