Aluminum-Weight-by-Alloy
Calculate aluminum weight for sheets, bars, tubes, angles. Weight = Volume × Density. 6061-T6: 0.0975 lb/in³ (2.70 g/cm³). Alloy density varies 2.66–2.81 g/cm³.
Why This Construction Metric Matters
Why: Accurate aluminum weight is critical for shipping, structural design, and cost. Aluminum is ~1/3 the density of steel.
How: Volume by shape (sheet: L×W×T; bar: πr²L; tube: π(R²−r²)L). Multiply by alloy density. 6061 most common; 7075 aircraft grade.
- ●6061-T6: general purpose; 7075-T6: aircraft; 5052-H32: marine.
- ●Sheet: L×W×T; round bar: πr²L; tube: π(R²−r²)L.
- ●Add 10–15% for machining waste when ordering.
- ●Aluminum Association publishes alloy densities (2.66–2.81 g/cm³).
📋 Quick Examples — Click to Load
Select Shape
6061-T6 (Most Common)
General purpose alloy with excellent corrosion resistance
📏 Dimensions (inches)
Planning estimates only. Verify with a licensed engineer or contractor before construction.
📐 Construction Industry Facts
Aluminum density ~2.7 g/cm³; steel ~7.85—aluminum ~1/3 the weight.
— Aluminum Association
7075-T6 is aircraft-grade; 6061-T6 is most common structural alloy.
— ASTM
5052-H32 has superior marine/saltwater corrosion resistance.
— Aluminum Association
6063-T5: architectural extrusions; 1100-O: 99% pure, very workable.
— Alloy guide
📋 Key Takeaways
- • Weight = Volume × Density | 6061-T6: 0.0975 lb/in³ (2.70 g/cm³)
- • Sheet: L×W×T | Round bar: πr²L | Tube: π(R²−r²)L
- • Alloy density varies 2.66–2.81 g/cm³; use correct alloy for accuracy
- • Add 10–15% for machining waste; verify alloy availability before ordering
Did You Know?
Aluminum is ~1/3 the density of steel. 6061-T6: 0.0975 lb/in³.
Source: Aluminum Association
Angle cross-section: (A×T) + ((B−T)×T). Channel: web×T + 2×flange×T.
Source: ASM Handbook
7075-T6 is aircraft grade; 5052-H32 excels in marine/saltwater.
Source: ASTM
Sheet gauges: 0.025" to 1". Common: 0.063", 0.125", 0.25".
Source: Mill specs
6063-T5: architectural extrusions. 1100-O: 99% pure, very workable.
Source: Alloy guide
Price multipliers: 6061=1.0, 7075=1.8, 5052=1.1, 3003=0.85.
Source: Market
How Aluminum Weight Is Calculated
Volume depends on shape. Weight = Volume × Alloy Density. Alloy density varies by grade.
Sheet/Plate
V = L × W × T
Round Tube
V = π × (R² − r²) × L
Expert Tips
Verify Alloy
Check availability before ordering.
Add Waste
10–15% for machining.
OD vs ID
Tubes: use OD and wall thickness.
Mill Certs
Critical apps need certs.
Alloy Comparison Table
| Alloy | Density (lb/in³) | Strength | Best For |
|---|---|---|---|
| 6061-T6 | 0.0975 | Medium-High | Structural frames |
| 6063-T5 | 0.0975 | Medium | Window frames |
| 7075-T6 | 0.1015 | Very High | Aircraft structures |
| 5052-H32 | 0.0968 | Medium | Boat hulls |
| 2024-T3 | 0.1005 | Very High | Aircraft skins |
| 3003-H14 | 0.0986 | Low-Medium | Cooking utensils |
| 1100-O | 0.0978 | Low | Food containers |
| 5083-H116 | 0.0960 | High | Shipbuilding |
Frequently Asked Questions
What density for 6061-T6 aluminum?
6061-T6 has a density of 0.0975 lb/in³ (2.70 g/cm³). It is the most common general-purpose structural aluminum alloy.
How do I calculate aluminum tube weight?
Volume = π × (R_outer² − R_inner²) × L. Weight = Volume × alloy density. Use OD and wall thickness to find inner radius.
7075 vs 6061 aluminum—which to use?
7075-T6: higher strength, aircraft grade, limited weldability. 6061-T6: better weldability, general use, most versatile.
Best aluminum alloy for marine applications?
5052-H32 or 5083-H116. Both offer superior corrosion resistance in saltwater environments.
What units does the calculator support?
Input: inches, feet, mm, cm, meters. Output: lbs and kg. All calculations convert to consistent units internally.
How is angle iron cross-section calculated?
Cross-section = (A×T) + ((B−T)×T) for L-shape. Multiply by length and density for weight.
Key Numbers
📚 Sources
⚠️ Disclaimer: Weight estimates are for planning. Verify with supplier. Densities and prices vary. Not for structural certification.
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