Copper C11000 Flat Bar Weight
Mass per metre and per foot for copper c11000 flat 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 16.1 kg (36.0 lb per 20 ft).
At the reference dimensions (w = 50 mm, t = 6 mm) this section has a cross-sectional area of 300.0 mm², giving 2.682 kg/m (1.802 lb/ft). Against carbon steel's 7,850 kg/m³ that is +13.9 % — the same section in steel would be 2.355 kg/m.
Flat Bar — formula and derivation
Area of a flat bar
A = w · t
A = w × t, where w is width and t is thickness
Worked through with the default dimensions:
A = w × tA = 50 × 6A = 300.0 mm²
- w
- Width
- t
- Thickness
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 2.6820 kg/m for the reference size above.
Copper flat bar — size series
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.322 kg/m · 0.216 lb/ft | 0.429 kg/m · 0.288 lb/ft | 0.536 kg/m · 0.360 lb/ft | 0.644 kg/m · 0.433 lb/ft | 0.858 kg/m · 0.577 lb/ft | 1.073 kg/m · 0.721 lb/ft | 1.287 kg/m · 0.865 lb/ft | 1.716 kg/m · 1.153 lb/ft | 2.146 kg/m · 1.442 lb/ft |
| 16 mm | 0.429 kg/m · 0.288 lb/ft | 0.572 kg/m · 0.384 lb/ft | 0.715 kg/m · 0.481 lb/ft | 0.858 kg/m · 0.577 lb/ft | 1.144 kg/m · 0.769 lb/ft | 1.430 kg/m · 0.961 lb/ft | 1.716 kg/m · 1.153 lb/ft | 2.289 kg/m · 1.538 lb/ft | 2.861 kg/m · 1.922 lb/ft |
| 20 mm | 0.536 kg/m · 0.360 lb/ft | 0.715 kg/m · 0.481 lb/ft | 0.894 kg/m · 0.601 lb/ft | 1.073 kg/m · 0.721 lb/ft | 1.430 kg/m · 0.961 lb/ft | 1.788 kg/m · 1.201 lb/ft | 2.146 kg/m · 1.442 lb/ft | 2.861 kg/m · 1.922 lb/ft | 3.576 kg/m · 2.403 lb/ft |
| 25 mm | 0.670 kg/m · 0.451 lb/ft | 0.894 kg/m · 0.601 lb/ft | 1.117 kg/m · 0.751 lb/ft | 1.341 kg/m · 0.901 lb/ft | 1.788 kg/m · 1.201 lb/ft | 2.235 kg/m · 1.502 lb/ft | 2.682 kg/m · 1.802 lb/ft | 3.576 kg/m · 2.403 lb/ft | 4.470 kg/m · 3.004 lb/ft |
| 30 mm | 0.805 kg/m · 0.541 lb/ft | 1.073 kg/m · 0.721 lb/ft | 1.341 kg/m · 0.901 lb/ft | 1.609 kg/m · 1.081 lb/ft | 2.146 kg/m · 1.442 lb/ft | 2.682 kg/m · 1.802 lb/ft | 3.218 kg/m · 2.163 lb/ft | 4.291 kg/m · 2.884 lb/ft | 5.364 kg/m · 3.604 lb/ft |
| 40 mm | 1.073 kg/m · 0.721 lb/ft | 1.430 kg/m · 0.961 lb/ft | 1.788 kg/m · 1.201 lb/ft | 2.146 kg/m · 1.442 lb/ft | 2.861 kg/m · 1.922 lb/ft | 3.576 kg/m · 2.403 lb/ft | 4.291 kg/m · 2.884 lb/ft | 5.722 kg/m · 3.845 lb/ft | 7.152 kg/m · 4.806 lb/ft |
| 50 mm | 1.341 kg/m · 0.901 lb/ft | 1.788 kg/m · 1.201 lb/ft | 2.235 kg/m · 1.502 lb/ft | 2.682 kg/m · 1.802 lb/ft | 3.576 kg/m · 2.403 lb/ft | 4.470 kg/m · 3.004 lb/ft | 5.364 kg/m · 3.604 lb/ft | 7.152 kg/m · 4.806 lb/ft | 8.940 kg/m · 6.007 lb/ft |
| 60 mm | 1.609 kg/m · 1.081 lb/ft | 2.146 kg/m · 1.442 lb/ft | 2.682 kg/m · 1.802 lb/ft | 3.218 kg/m · 2.163 lb/ft | 4.291 kg/m · 2.884 lb/ft | 5.364 kg/m · 3.604 lb/ft | 6.437 kg/m · 4.325 lb/ft | 8.582 kg/m · 5.767 lb/ft | 10.728 kg/m · 7.209 lb/ft |
| 80 mm | 2.146 kg/m · 1.442 lb/ft | 2.861 kg/m · 1.922 lb/ft | 3.576 kg/m · 2.403 lb/ft | 4.291 kg/m · 2.884 lb/ft | 5.722 kg/m · 3.845 lb/ft | 7.152 kg/m · 4.806 lb/ft | 8.582 kg/m · 5.767 lb/ft | 11.443 kg/m · 7.689 lb/ft | 14.304 kg/m · 9.612 lb/ft |
| 100 mm | 2.682 kg/m · 1.802 lb/ft | 3.576 kg/m · 2.403 lb/ft | 4.470 kg/m · 3.004 lb/ft | 5.364 kg/m · 3.604 lb/ft | 7.152 kg/m · 4.806 lb/ft | 8.940 kg/m · 6.007 lb/ft | 10.728 kg/m · 7.209 lb/ft | 14.304 kg/m · 9.612 lb/ft | 17.880 kg/m · 12.015 lb/ft |
Rows: width (mm). Columns: thickness (mm). Computed for Copper C11000 at 8940 kg/m³.
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 36.0 | 48.0 | 60.0 | 72.0 | 96.0 | 120.0 | 144.0 | 192.0 | 240.0 |
| 16 mm | 48.0 | 64.0 | 80.0 | 96.0 | 128.0 | 160.0 | 192.0 | 256.0 | 320.0 |
| 20 mm | 60.0 | 80.0 | 100.0 | 120.0 | 160.0 | 200.0 | 240.0 | 320.0 | 400.0 |
| 25 mm | 75.0 | 100.0 | 125.0 | 150.0 | 200.0 | 250.0 | 300.0 | 400.0 | 500.0 |
| 30 mm | 90.0 | 120.0 | 150.0 | 180.0 | 240.0 | 300.0 | 360.0 | 480.0 | 600.0 |
| 40 mm | 120.0 | 160.0 | 200.0 | 240.0 | 320.0 | 400.0 | 480.0 | 640.0 | 800.0 |
| 50 mm | 150.0 | 200.0 | 250.0 | 300.0 | 400.0 | 500.0 | 600.0 | 800.0 | 1,000.0 |
| 60 mm | 180.0 | 240.0 | 300.0 | 360.0 | 480.0 | 600.0 | 720.0 | 960.0 | 1,200.0 |
| 80 mm | 240.0 | 320.0 | 400.0 | 480.0 | 640.0 | 800.0 | 960.0 | 1,280.0 | 1,600.0 |
| 100 mm | 300.0 | 400.0 | 500.0 | 600.0 | 800.0 | 1,000.0 | 1,200.0 | 1,600.0 | 2,000.0 |
Area is a property of the geometry alone, so this table is the same for every material. It is what you enter into a stress calculation; the mass table is what you enter into an order.
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.
The same flat 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 | 2.355 | 1.582 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 2.310 | 1.552 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 0.810 | 0.544 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 0.804 | 0.540 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 0.843 | 0.566 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 2.682 | 1.802 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 2.550 | 1.714 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 2.640 | 1.774 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 1.353 | 0.909 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 2.160 | 1.451 | -8.3 % |
| Lead | 11,340 | 0.4097 | 3.402 | 2.286 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.420 | 0.282 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.288 | 0.194 | -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 flat bar
Flat bar is where the site’s most common estimating mistake shows up: weight is independent of how the bar is oriented, but stiffness is not. A 50 × 6 flat bent about its strong axis is roughly 69 times stiffer than the same bar bent about its weak axis, while both weigh 2.36 kg/m. Reading weight off a flat-bar table tells you what to order; it tells you nothing about whether the section will carry the load.
Specified as width × thickness. Edge condition (square, radiused, or sheared) changes the effective area slightly, not the nominal weight.
Download this data
Copper flat 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 flat bar weigh?
At the reference dimensions (w = 50 mm, t = 6 mm) a copper c11000 flat bar of this size weighs 2.682 kg/m, or 1.802 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 flat bar calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = w · t. At the reference dimensions that gives 300.0 mm², and multiplying by copper c11000's density of 8,940 kg/m³ gives 2.682 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 flat 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 flat 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 300.0 mm² (0.4650 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 flat 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 flat 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 2.355 kg/m for comparison.
Other materials, same flat bar
The same geometry in every material, so the only variable is density.
- Carbon steel flat bar — 7850 kg/m³
- SS 304 flat bar — 8000 kg/m³
- SS 316 flat bar — 8000 kg/m³
- AL 6061 flat bar — 2700 kg/m³
- Brass flat bar — 8500 kg/m³
- HDPE flat bar — 960 kg/m³
- PVC flat bar — 1400 kg/m³
- AL 5052 flat 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 square bar — A = a²
- Copper hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- 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
Flat Bar area from A = w · t. 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.