Aluminum 7075-T6 Round Tube Weight
Mass per metre and per foot for aluminum 7075-t6 round tube at 2,810 kg/m³ (ASTM B211 / B209 (T6 temper)). Every figure is for the section as drawn. A 6 m length of this size weighs 7.5 kg (16.7 lb per 20 ft).
At the reference dimensions (D = 50 mm, t = 3 mm) this section has a cross-sectional area of 443.0 mm², giving 1.245 kg/m (0.836 lb/ft). Against carbon steel's 7,850 kg/m³ that is -64.2 % — the same section in steel would be 3.477 kg/m.
Round Tube — formula and derivation
Area of a round tube
A = π/4 · (D² − d²), d = D − 2t
A = π/4 × (D² − d²), where D is the outside diameter, d the inside diameter, and d = D − 2t for wall thickness t
Worked through with the default dimensions:
A = π/4 × (D² − d²)d = 50 − 2 × 3 = 44.0 mmA = 0.785398 × (50² − 44.0²)A = 0.785398 × 564.0A = 443.0 mm²
- D
- Outside diameter
- t
- Wall thickness — Must be less than half the outside diameter.
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 2,810 kg/m³ that is 1.2447 kg/m for the reference size above.
AL 7075 round tube — size series
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.097 kg/m · 0.065 lb/ft | 0.139 kg/m · 0.093 lb/ft | 0.177 kg/m · 0.119 lb/ft | 0.238 kg/m · 0.160 lb/ft | 0.282 kg/m · 0.190 lb/ft | 0.309 kg/m · 0.208 lb/ft | 0.318 kg/m · 0.214 lb/ft | 0.282 kg/m · 0.190 lb/ft |
| 16 mm | 0.132 kg/m · 0.089 lb/ft | 0.192 kg/m · 0.129 lb/ft | 0.247 kg/m · 0.166 lb/ft | 0.344 kg/m · 0.231 lb/ft | 0.424 kg/m · 0.285 lb/ft | 0.486 kg/m · 0.326 lb/ft | 0.530 kg/m · 0.356 lb/ft | 0.565 kg/m · 0.380 lb/ft |
| 20 mm | 0.168 kg/m · 0.113 lb/ft | 0.245 kg/m · 0.165 lb/ft | 0.318 kg/m · 0.214 lb/ft | 0.450 kg/m · 0.303 lb/ft | 0.565 kg/m · 0.380 lb/ft | 0.662 kg/m · 0.445 lb/ft | 0.742 kg/m · 0.498 lb/ft | 0.847 kg/m · 0.569 lb/ft |
| 25 mm | 0.212 kg/m · 0.142 lb/ft | 0.311 kg/m · 0.209 lb/ft | 0.406 kg/m · 0.273 lb/ft | 0.583 kg/m · 0.392 lb/ft | 0.742 kg/m · 0.498 lb/ft | 0.883 kg/m · 0.593 lb/ft | 1.006 kg/m · 0.676 lb/ft | 1.201 kg/m · 0.807 lb/ft |
| 32 mm | 0.274 kg/m · 0.184 lb/ft | 0.404 kg/m · 0.271 lb/ft | 0.530 kg/m · 0.356 lb/ft | 0.768 kg/m · 0.516 lb/ft | 0.989 kg/m · 0.664 lb/ft | 1.192 kg/m · 0.801 lb/ft | 1.377 kg/m · 0.925 lb/ft | 1.695 kg/m · 1.139 lb/ft |
| 40 mm | 0.344 kg/m · 0.231 lb/ft | 0.510 kg/m · 0.343 lb/ft | 0.671 kg/m · 0.451 lb/ft | 0.980 kg/m · 0.658 lb/ft | 1.271 kg/m · 0.854 lb/ft | 1.545 kg/m · 1.038 lb/ft | 1.801 kg/m · 1.210 lb/ft | 2.260 kg/m · 1.519 lb/ft |
| 50 mm | 0.433 kg/m · 0.291 lb/ft | 0.642 kg/m · 0.432 lb/ft | 0.847 kg/m · 0.569 lb/ft | 1.245 kg/m · 0.836 lb/ft | 1.624 kg/m · 1.091 lb/ft | 1.986 kg/m · 1.335 lb/ft | 2.331 kg/m · 1.566 lb/ft | 2.966 kg/m · 1.993 lb/ft |
| 63 mm | 0.547 kg/m · 0.368 lb/ft | 0.814 kg/m · 0.547 lb/ft | 1.077 kg/m · 0.724 lb/ft | 1.589 kg/m · 1.068 lb/ft | 2.083 kg/m · 1.400 lb/ft | 2.560 kg/m · 1.720 lb/ft | 3.019 kg/m · 2.029 lb/ft | 3.884 kg/m · 2.610 lb/ft |
| 76 mm | 0.662 kg/m · 0.445 lb/ft | 0.987 kg/m · 0.663 lb/ft | 1.307 kg/m · 0.878 lb/ft | 1.933 kg/m · 1.299 lb/ft | 2.542 kg/m · 1.708 lb/ft | 3.134 kg/m · 2.106 lb/ft | 3.708 kg/m · 2.491 lb/ft | 4.802 kg/m · 3.227 lb/ft |
| 89 mm | 0.777 kg/m · 0.522 lb/ft | 1.159 kg/m · 0.779 lb/ft | 1.536 kg/m · 1.032 lb/ft | 2.278 kg/m · 1.530 lb/ft | 3.001 kg/m · 2.017 lb/ft | 3.708 kg/m · 2.491 lb/ft | 4.396 kg/m · 2.954 lb/ft | 5.720 kg/m · 3.844 lb/ft |
| 114 mm | 0.998 kg/m · 0.670 lb/ft | 1.490 kg/m · 1.001 lb/ft | 1.977 kg/m · 1.329 lb/ft | 2.940 kg/m · 1.975 lb/ft | 3.884 kg/m · 2.610 lb/ft | 4.811 kg/m · 3.233 lb/ft | 5.720 kg/m · 3.844 lb/ft | 7.486 kg/m · 5.030 lb/ft |
| 168 mm | 1.474 kg/m · 0.991 lb/ft | 2.205 kg/m · 1.482 lb/ft | 2.931 kg/m · 1.969 lb/ft | 4.370 kg/m · 2.936 lb/ft | 5.791 kg/m · 3.891 lb/ft | 7.195 kg/m · 4.835 lb/ft | 8.581 kg/m · 5.766 lb/ft | 11.300 kg/m · 7.593 lb/ft |
Rows: outside diameter (mm). Columns: wall thickness (mm). Computed for Aluminum 7075-T6 at 2810 kg/m³.
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 34.6 | 49.5 | 62.8 | 84.8 | 100.5 | 110.0 | 113.1 | 100.5 |
| 16 mm | 47.1 | 68.3 | 88.0 | 122.5 | 150.8 | 172.8 | 188.5 | 201.1 |
| 20 mm | 59.7 | 87.2 | 113.1 | 160.2 | 201.1 | 235.6 | 263.9 | 301.6 |
| 25 mm | 75.4 | 110.7 | 144.5 | 207.3 | 263.9 | 314.2 | 358.1 | 427.3 |
| 32 mm | 97.4 | 143.7 | 188.5 | 273.3 | 351.9 | 424.1 | 490.1 | 603.2 |
| 40 mm | 122.5 | 181.4 | 238.8 | 348.7 | 452.4 | 549.8 | 640.9 | 804.2 |
| 50 mm | 153.9 | 228.6 | 301.6 | 443.0 | 578.1 | 706.9 | 829.4 | 1,055.6 |
| 63 mm | 194.8 | 289.8 | 383.3 | 565.5 | 741.4 | 911.1 | 1,074.4 | 1,382.3 |
| 76 mm | 235.6 | 351.1 | 465.0 | 688.0 | 904.8 | 1,115.3 | 1,319.5 | 1,709.0 |
| 89 mm | 276.5 | 412.3 | 546.6 | 810.5 | 1,068.1 | 1,319.5 | 1,564.5 | 2,035.8 |
| 114 mm | 355.0 | 530.1 | 703.7 | 1,046.2 | 1,382.3 | 1,712.2 | 2,035.8 | 2,664.1 |
| 168 mm | 524.6 | 784.6 | 1,043.0 | 1,555.1 | 2,060.9 | 2,560.4 | 3,053.6 | 4,021.2 |
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 round tube in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Aluminum 7075-T6 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 | 3.477 | 2.337 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.411 | 2.292 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.196 | 0.804 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.187 | 0.798 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.245 | 0.836 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 3.960 | 2.661 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 3.765 | 2.530 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 3.898 | 2.619 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 1.998 | 1.342 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.189 | 2.143 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.023 | 3.375 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.620 | 0.417 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.425 | 0.286 | -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 aluminum 7075-t6
Zinc-bearing, aerospace-grade and the strongest aluminium in ordinary supply — comparable in strength to some mild steels. It is also the densest aluminium here at 2,810 kg/m³, which is the trade-off nobody mentions: choosing 7075 over 6061 for strength costs 4.1 % more mass for the same volume. Its corrosion resistance is poor without cladding or anodising, and it is generally considered unweldable, so it belongs in machined and riveted parts, not fabricated frames.
- Density
- 2,810 kg/m³ = 0.1015 lb/in³ · 0.3580× carbon steel · typical spread ±1 %
- Specification
- ASTM B211 / B209 (T6 temper)
- Equivalents
- EN AW-7075 · JIS A7075 · GB 7075
- Typical uses
- Aerospace structural parts · High-load bicycle and motorsport · Moulds and tooling plate · Precision machined fittings
Not recommended for sustained elevated-temperature service; strength falls off well before 6061’s does.
About round tube
Hollow sections are the most efficient way to buy stiffness by weight, and the numbers are stark: a 50 mm outside diameter tube with a 3 mm wall has the same area as a 22.6 mm solid bar — about 20 % of the mass — but its second moment of area is roughly 2.4 times larger. The catch is local: a thin wall buckles and dents long before it yields, so tube is chosen for stiffness and stability, never for where impact or crushing is expected.
Specified as outside diameter × wall thickness. State the standard (e.g. EN 10219) and whether the tube is welded or seamless.
Download this data
AL 7075 round tube — 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 aluminum 7075-t6 round tube weigh?
At the reference dimensions (D = 50 mm, t = 3 mm) a aluminum 7075-t6 round tube of this size weighs 1.245 kg/m, or 0.836 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 round tube calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = π/4 · (D² − d²), d = D − 2t. At the reference dimensions that gives 443.0 mm², and multiplying by aluminum 7075-t6's density of 2,810 kg/m³ gives 1.245 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 aluminum 7075-t6 weigh more or less than steel?
It is lighter than carbon steel for the same section — about 64 % lighter at 2,810 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a round tube of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 0.3580× carbon steel.
What is the cross-sectional area of a round tube?
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 443.0 mm² (0.6866 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 al 7075 round tube weigh the same as a al 7075 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 AL 7075 weight or carbon steel weight for costing?
Use the material you are actually buying. At 2,810 kg/m³ against carbon steel's 7,850 kg/m³, the same round tube differs by 64.2 % 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 3.477 kg/m for comparison.
Other materials, same round tube
The same geometry in every material, so the only variable is density.
- Carbon steel round tube — 7850 kg/m³
- SS 304 round tube — 8000 kg/m³
- SS 316 round tube — 8000 kg/m³
- AL 6061 round tube — 2700 kg/m³
- Copper round tube — 8940 kg/m³
- Brass round tube — 8500 kg/m³
- HDPE round tube — 960 kg/m³
- PVC round tube — 1400 kg/m³
Other AL 7075 sections
The same density applied to every shape the site covers.
- AL 7075 round bar — A = π/4 · d²
- AL 7075 square bar — A = a²
- AL 7075 hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- AL 7075 flat bar — A = w · t
- AL 7075 plate — A = w · t
- AL 7075 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
Round Tube area from A = π/4 · (D² − d²), d = D − 2t. Mass computed as area × length × density at 2,810 kg/m³ (ASTM B211 / B209 (T6 temper)). 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.