Aluminum Weight Calculator

Calculate the weight of aluminum pieces for any project. Select the shape (sheet, round bar, square bar, tube, angle, or channel), enter dimensions, and choose the alloy for precise weight estimates in pounds and kilograms.

Length of the aluminum piece

Width for sheet/plate, or side for square bar

Thickness of the material (1/8" = 0.125, 1/4" = 0.25)

Inner diameter for tube (outer diameter = width)

Flange width for angle or channel

Number of identical pieces

Aluminum Weight Formula: Weight = Volume × Density Volume by Shape: Sheet/Plate: V = L × W × T Round Bar/Rod: V = π × r² × L Square Bar: V = W² × L Hex Bar: V = (3√3/2) × s² × L Round Tube: V = π(R² - r²) × L Square Tube: V = (W² - ID²) × L Equal Angle (L): V = (W×T + (fₗ-T)×T) × L Channel (C): V = (W×T + 2(fₗ-T)×T) × L Density Conversion: 1 g/cm³ = 0.03613 lb/in³ Aluminum Alloy Density: • 3003: 2.66 g/cm³ • 6063: 2.69 g/cm³ • 5052: 2.68 g/cm³ • 6061: 2.71 g/cm³ • 2024: 2.73 g/cm³ • 7075: 2.78 g/cm³ • Cast: 2.81 g/cm³ Weight Conversion: 1 lb = 0.4536 kg
Example 1: 6061 Aluminum Sheet Shape: Sheet/Plate Dimensions: 48 × 24 × 0.125 inches Alloy: 6061-T6 (2.71 g/cm³) Volume = 48 × 24 × 0.125 = 144 in³ Weight = 144 × 0.0979 = 14.10 lbs (6.40 kg) Example 2: 7075 Round Bar Shape: Round Bar, 1" diameter × 36" length Alloy: 7075-T6 (2.78 g/cm³ / 0.1004 lb/in³) Area = π × 0.5² = 0.7854 in² Volume = 0.7854 × 36 = 28.27 in³ Weight = 28.27 × 0.1004 = 2.84 lbs (1.29 kg) Example 3: 6061 Round Tube Shape: Round Tube Outer diameter: 2", Inner: 1.5" Length: 48" Volume = π(1² - 0.75²) × 48 = π(0.4375) × 48 = 65.97 in³ Weight = 65.97 × 0.0979 = 6.46 lbs (2.93 kg) Example 4: 5052 Sheet for Marine Use Shape: Sheet, 36 × 24 × 0.063 inches Alloy: 5052-H32 (2.68 g/cm³ / 0.0968 lb/in³) Volume = 36 × 24 × 0.063 = 54.43 in³ Weight = 54.43 × 0.0968 = 5.27 lbs (2.39 kg) Weight Comparison (same volume): Aluminum (6061): 14.1 lbs Steel (mild): 40.8 lbs (2.9× heavier) Copper: 46.6 lbs (3.3× heavier) Titanium: 23.3 lbs (1.65× heavier)

How is aluminum weight calculated?

Aluminum weight is calculated as Weight = Volume × Density. First calculate the volume based on the shape (sheet: L×W×T, round bar: πr²L, tube: π(R²-r²)L, etc.), then multiply by the alloy density. 6061-T6 aluminum has a density of 2.71 g/cm³ (0.0979 lb/in³). For example, a 48×24×0.125" 6061 sheet weighs 48×24×0.125×0.0979 = 14.11 lbs.

What is the density of aluminum compared to other metals?

Aluminum is remarkably lightweight, with a density of ~2.71 g/cm³ - about one-third that of steel (7.85 g/cm³) and copper (8.96 g/cm³). An aluminum part weighs roughly 35% of an equivalent steel part. Despite its light weight, 7075-T6 aluminum approaches the strength of mild steel, making it ideal for aerospace, automotive, and structural applications where weight savings are critical.

How do different aluminum alloys affect weight?

Different aluminum alloys have slightly different densities: 3003 and 6063 are among the lightest at 2.66-2.69 g/cm³, 6061 is standard at 2.71 g/cm³, 2024 and 7075 are 2.73-2.78 g/cm³, and cast alloys can be 2.81 g/cm³. While these differences seem small (up to 5%), in large projects they can affect total weight significantly. Always use the exact alloy density for precise calculations.

How do I estimate aluminum weight for irregular shapes?

For irregular shapes, calculate the volume by dividing the shape into geometric primitives (rectangles, cylinders, triangles) and summing their volumes. Alternatively, use the displacement method: submerge the piece in water and measure the displaced volume (1 mL = 1 cm³). For large pieces, use the average cross-sectional area method: cut a template, weigh it, and scale by the ratio.

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