Metal Weight Calculator
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A metal weight calculator computes the total mass of plates, sheets, round bar stocks, square structures, hollow tubing, and hexagonal shapes using density coefficients.
Formula:
Weight = Volume × Density × Quantity
Worked Example: A steel plate 0.25 inches thick × 48 inches wide × 8 feet (96 inches) long has a volume of 1,152 cubic inches. At a steel density of 0.2836 lb/in³, it weighs 326.71 pounds.
Standard Metal Section Densities & Classifications
Calculations align with ASTM A6 standards for steel structural profiles, ASTM B209 for aluminum sheets, and NIST material databases. Standard density metrics:
| Metal / Alloy Profile | Imperial Density (lb/in³) | Metric Density (kg/m³) |
|---|---|---|
| Carbon Steel (ASTM A36) | 0.2836 | 7,850 |
| Stainless Steel (304) | 0.2890 | 8,000 |
| Aluminum (6061-T6) | 0.0975 | 2,700 |
| Pure Copper (C110) | 0.3230 | 8,960 |
| Yellow Brass (C360) | 0.3070 | 8,500 |
This dataset is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). You are free to copy, distribute, or embed this table on your website, provided you attribute it with a link:
Sources & Governing Codes
- Wikipedia Material Density & Physical Constants: Wikipedia Material Density & Physical Constants View Standard
- Wikipedia Steel Alloys & Structural Properties: Wikipedia Steel Alloys & Structural Properties View Standard
Frequently Asked Questions (FAQ)
How is the weight of a metal plate calculated?
Multiply thickness by width by length to get the volume, then multiply by the material density. For steel: Weight = Thickness (in) × Width (in) × Length (in) × 0.2836 lb/in³.
Why does steel weigh more than aluminum?
Carbon steel has a mass density of 0.2836 lb/in³ (7,850 kg/m³), whereas aluminum is much lighter at 0.0975 lb/in³ (2,700 kg/m³), making steel about three times heavier for the same volume.
How do you compute hollow pipe weight?
Calculate the volume of the outer cylinder and subtract the volume of the inner cylinder: Volume = π × (Outer Diameter² - Inner Diameter²) ÷ 4 × Length. Then multiply by density.
What is the standard density of stainless steel?
The standard density of stainless steel (such as Grade 304) is 0.2890 lb/in³ or approximately 8,000 kg/m³.
How do I find Hexagonal bar volume?
Volume of a hexagon is calculated as: Area × Length = 0.8660254 × (Width across flats)² × Length.
What are ASTM A36 weight tolerances?
ASTM A36 steel structural sections allow for minor mill rolling tolerances, typically within ±2.5% to ±5% of nominal computed weights depending on shape profile dimensions.
Does copper weigh more than steel?
Yes. Copper is denser at 0.3230 lb/in³ (8,960 kg/m³) compared to carbon steel at 0.2836 lb/in³ (7,850 kg/m³).
How do I convert structural bar feet to pounds?
Calculate the cross-sectional area of the bar in square inches, multiply by 12 to get volume per linear foot, then multiply by density (0.2836 for steel) to get lbs per foot.
Does wall thickness affect structural tubing weight?
Yes. A thicker wall reduces the inside diameter (ID) of the hollow core, which increases the total volume of metal and therefore makes the tube heavier.
What standard densities does NIST publish?
NIST publications specify structural alloy compositions and standard reference densities for materials engineering audits.
What is the density of mild carbon steel?
Standard carbon steel (ASTM A36/A516) has a density of 0.2833 lbs per cubic inch (7,850 kg per cubic meter).
How much heavier is stainless steel compared to aluminum?
Stainless steel (density ~0.290 lb/in³) is approximately 2.9 times denser and heavier than 6061 aluminum (density ~0.098 lb/in³).
How do you calculate the weight of hollow round steel tubing?
Weight = π × (Outer Radius² - Inner Radius²) × Length × Material Density.
What is the gauge-to-thickness conversion for sheet metal?
Standard sheet metal gauges represent thickness in decimal inches. For example, 16-gauge steel is 0.0598 inches (1.52 mm), while 11-gauge steel is 0.1196 inches (3.04 mm).
What is the weight per square foot of 1/4-inch steel plate?
A 1/4-inch (0.250") thick steel plate weighs exactly 10.20 lbs per square foot (49.8 kg per square meter).
How do you calculate the weight of structural I-beams or W-shapes?
Structural steel shapes are designated by nominal depth and weight per foot. A W12×26 beam weighs exactly 26.0 lbs per linear foot.
What is the density of brass and copper compared to carbon steel?
Copper (0.323 lb/in³) and yellow brass (0.305 lb/in³) are slightly denser and heavier than carbon steel (0.283 lb/in³).
Why does galvanized steel weigh slightly more than raw black steel?
Hot-dip galvanizing adds a protective zinc coating layer that typically increases sheet or structural weight by 0.5% to 1.5%.
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