Copper C11000 Square Bar Weight
Mass per metre and per foot for copper c11000 square bar at 8,940 kg/m³ (ASTM B152 / B187 (UNS C11000, ETP)). Every figure is for the section as drawn. A 6 m length of this size weighs 33.5 kg (75.1 lb per 20 ft).
At the reference dimensions (a = 25 mm) this section has a cross-sectional area of 625.0 mm², giving 5.588 kg/m (3.755 lb/ft). Against carbon steel's 7,850 kg/m³ that is +13.9 % — the same section in steel would be 4.906 kg/m.
Square Bar — formula and derivation
Area of a square bar
A = a²
A = a², where a is the side length
Worked through with the default dimensions:
A = a²A = 25²A = 625.0 mm²
- a
- Side
Weight follows from the area with no further geometry: m = A × 10⁻⁶ × ρ, where A is in mm², ρ in kg/m³ and m in kg/m. At 8,940 kg/m³ that is 5.5875 kg/m for the reference size above.
Copper square bar — size series
| Side | Cross-section | Mass / length |
|---|---|---|
| 6.0 mm | 36.00 mm² · 0.0558 in² | 0.322 kg/m · 0.216 lb/ft |
| 8.0 mm | 64.00 mm² · 0.0992 in² | 0.572 kg/m · 0.384 lb/ft |
| 10 mm | 100.00 mm² · 0.1550 in² | 0.894 kg/m · 0.601 lb/ft |
| 12 mm | 144.00 mm² · 0.2232 in² | 1.287 kg/m · 0.865 lb/ft |
| 16 mm | 256.00 mm² · 0.3968 in² | 2.289 kg/m · 1.538 lb/ft |
| 20 mm | 400.00 mm² · 0.6200 in² | 3.576 kg/m · 2.403 lb/ft |
| 25 mm | 625.00 mm² · 0.9688 in² | 5.588 kg/m · 3.755 lb/ft |
| 30 mm | 900.00 mm² · 1.3950 in² | 8.046 kg/m · 5.407 lb/ft |
| 40 mm | 1,600.00 mm² · 2.4800 in² | 14.304 kg/m · 9.612 lb/ft |
| 50 mm | 2,500.00 mm² · 3.8750 in² | 22.350 kg/m · 15.019 lb/ft |
| 60 mm | 3,600.00 mm² · 5.5800 in² | 32.184 kg/m · 21.627 lb/ft |
| 80 mm | 6,400.00 mm² · 9.9200 in² | 57.216 kg/m · 38.447 lb/ft |
| 100 mm | 10,000.00 mm² · 15.5000 in² | 89.400 kg/m · 60.074 lb/ft |
Computed for Copper at 8940 kg/m³ (0.3230 lb/in³). ASTM B152 / B187 (UNS C11000, ETP).
Each row is one nominal size. Because the area is computed from your dimensions rather than read from a mill table, a non-standard size is just as accurate — put it into the calculator above rather than interpolating between rows.
Imperial sizes
Square Bar is also bought in inch sizes. The conversions below are exact (1 in = 25.4 mm by definition), so the metric equivalents are the true millimetre dimensions rather than a rounded nominal figure.
| Stock size | Metric equivalent mm | Cross-section | Mass / length |
|---|---|---|---|
| 1/4 in | 6.35 | 40.32 mm² · 0.0625 in² | 0.360 kg/m · 0.242 lb/ft |
| 3/8 in | 9.52 | 90.73 mm² · 0.1406 in² | 0.811 kg/m · 0.545 lb/ft |
| 1/2 in | 12.70 | 161.29 mm² · 0.2500 in² | 1.442 kg/m · 0.969 lb/ft |
| 5/8 in | 15.88 | 252.02 mm² · 0.3906 in² | 2.253 kg/m · 1.514 lb/ft |
| 3/4 in | 19.05 | 362.90 mm² · 0.5625 in² | 3.244 kg/m · 2.180 lb/ft |
| 1 in | 25.40 | 645.16 mm² · 1.0000 in² | 5.768 kg/m · 3.876 lb/ft |
| 1-1/4 in | 31.75 | 1,008.06 mm² · 1.5625 in² | 9.012 kg/m · 6.056 lb/ft |
| 1-1/2 in | 38.10 | 1,451.61 mm² · 2.2500 in² | 12.977 kg/m · 8.720 lb/ft |
| 2 in | 50.80 | 2,580.64 mm² · 4.0000 in² | 23.071 kg/m · 15.503 lb/ft |
| 2-1/2 in | 63.50 | 4,032.25 mm² · 6.2500 in² | 36.048 kg/m · 24.223 lb/ft |
| 3 in | 76.20 | 5,806.44 mm² · 9.0000 in² | 51.910 kg/m · 34.882 lb/ft |
| 4 in | 101.60 | 10,322.56 mm² · 16.0000 in² | 92.284 kg/m · 62.012 lb/ft |
Stock sizes in inches, converted exactly at 25.4 mm per inch. Material: Copper C11000 at 8940 kg/m³.
The same square bar in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Copper C11000 is highlighted. The percentage column is against carbon steel, which is the figure most quotations are built on.
| Material | Density kg/m³ | lb/in³ | Mass / length kg/m | lb/ft | vs carbon steel |
|---|---|---|---|---|---|
| Carbon Steel | 7,850 | 0.2836 | 4.906 | 3.297 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 5.000 | 3.360 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 5.000 | 3.360 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 5.000 | 3.360 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 4.813 | 3.234 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.688 | 1.134 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.675 | 1.126 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.756 | 1.180 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 5.588 | 3.755 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 5.313 | 3.570 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 5.500 | 3.696 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 2.819 | 1.894 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 4.500 | 3.024 | -8.3 % |
| Lead | 11,340 | 0.4097 | 7.088 | 4.763 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.875 | 0.588 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.600 | 0.403 | -87.8 % |
Same geometry throughout, so the only variable is density. Carbon steel is highlighted as the baseline.
A note on using this table for costing: mass is not price. Aluminium is roughly a third of steel's mass here, but per kilogram it costs several times more, so a straight swap rarely saves money — what it buys is reduced load on a structure or a vehicle.
About copper c11000
Electrolytic tough pitch copper, 99.9 % Cu minimum — the electrical conductor standard, and the densest material here after lead at 8,940 kg/m³. That density is the point: high conductivity and high mass travel together in copper, which is why busbar and winding take-offs are always done by mass. It is 13.9 % heavier than carbon steel, so a copper busbar replacing a steel one of the same section gains weight while gaining conductivity.
- Density
- 8,940 kg/m³ = 0.3230 lb/in³ · 1.1389× carbon steel · typical spread ±1 %
- Specification
- ASTM B152 / B187 (UNS C11000, ETP)
- Equivalents
- EN CW004A · JIS C1100 · GB T2
- Typical uses
- Busbar and windings · Plumbing tube · Heat exchangers · Roofing and flashing
About square bar
A square bar has 27.3 % more area than the round bar that circumscribes it (a = d) and 21.5 % more mass — the corners of the square sit outside the circle. The reverse comparison is more useful in practice: a round bar of diameter d fits inside a square of side d with material to spare, so swapping square for round at the same nominal size removes about 21 % of the weight and produces a very similar-looking part.
Specified by side. State whether corners must be sharp or radiused; standard stock usually has a small corner radius.
Download this data
Copper square bar — CSV
Both buttons below read the tables rendered on this page, so the file matches what you are looking at. The full catalogue — all 16 materials across all 10 sections — is on the downloads page.
Fields are quoted per RFC 4180, with a UTF-8 byte-order mark so Excel reads the mm² and · characters correctly. Blank lines separate the weight matrix from the area matrix.
Frequently asked questions
How much does copper c11000 square bar weigh?
At the reference dimensions (a = 25 mm) a copper c11000 square bar of this size weighs 5.588 kg/m, or 3.755 lb/ft. The table above lists the figure for every standard size so you can read your size directly instead of scaling.
How is the weight of square bar calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = a². At the reference dimensions that gives 625.0 mm², and multiplying by copper c11000's density of 8,940 kg/m³ gives 5.588 kg/m. Nothing is looked up in a table — which is why a non-standard size is calculated just as accurately as a standard one.
Why does copper c11000 weigh more or less than steel?
It is heavier than carbon steel for the same section — about 14 % heavier at 8,940 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a square bar of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 1.1389× carbon steel.
What is the cross-sectional area of a square bar?
The area depends only on the dimensions, not on the material, so it is identical whichever material you select: at the reference dimensions it is 625.0 mm² (0.9688 in²). That is the number you would enter into a stress or deflection calculation, and it is why changing material on this page never changes the area column.
Does a copper square bar weigh the same as a copper part of a different shape?
No, and the difference is larger than most people expect. At equal nominal size, a square bar is 27.3 % heavier than a round bar, and a hollow section is typically 60–80 % lighter than the solid bar it replaces. Weight follows area, and area changes faster than dimensions do — which is exactly why this needs calculating rather than estimating.
Should I use Copper weight or carbon steel weight for costing?
Use the material you are actually buying. At 8,940 kg/m³ against carbon steel's 7,850 kg/m³, the same square bar differs by 13.9 % in mass. On a per-metre quote that is invisible; on a fabricated tonnage it is the difference between a margin and a loss. This page computes the steel figure as 4.906 kg/m for comparison.
Other materials, same square bar
The same geometry in every material, so the only variable is density.
- Carbon steel square bar — 7850 kg/m³
- SS 304 square bar — 8000 kg/m³
- SS 316 square bar — 8000 kg/m³
- AL 6061 square bar — 2700 kg/m³
- Brass square bar — 8500 kg/m³
- HDPE square bar — 960 kg/m³
- PVC square bar — 1400 kg/m³
- AL 5052 square bar — 2680 kg/m³
Other Copper sections
The same density applied to every shape the site covers.
- Copper round bar — A = π/4 · d²
- Copper hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- Copper flat bar — A = w · t
- Copper plate — A = w · t
- Copper round tube — A = π/4 · (D² − d²), d = D − 2t
- Copper square tube — A = a² − (a − 2t)²
Reference data and tools
- Metal weight overview — how the calculation works
- All 16 materials — densities and specifications
- All 10 sections — formulas and size series
- Density chart — lightest to heaviest
- Metal weight calculator — any size, any material
- All calculators — metal weight and pipe weight
- Download the data — CSV, generated from the same source
- Cross-reference tables — DN / NPS / material equivalents
- Methodology and sources — where every number comes from
Square Bar area from A = a². Mass computed as area × length × density at 8,940 kg/m³ (ASTM B152 / B187 (UNS C11000, ETP)). No weight on this page is copied from a published table — which is why figures can differ in the last significant digit from a mill's chart calculated at a nominal density.
- Elementary plane geometry. The circle, polygon and hollow-section area formulas.
- ASTM material specifications for each grade named in the material entry (A36, A240/A276, B209/B211/B221, B152/B16/B505, B265/B348, A48, B29, D1784, D3350).
- BIPM / NIST definitional constants: international inch = 25.4 mm, foot = 0.3048 m, pound = 0.45359237 kg.
Dataset version 2026.09.1 · dimensions last verified against source 2026-09-21. Found an error? Report it — corrections are issued with a version bump.