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Jewelry Metal Weight Calculator

Calculate weight of metal bar, plate, tube, and sheet stock from dimensions and alloy density. Supports steel, aluminum, copper, and common alloys.

Use this result well

Inputs that matter
Outer Diameter, Inner Diameter, Band Width / Height, Metal Type
Output to expect
Metal Weight Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Jewelry

Reference & details

How it works

Volume from Shape

Calculate cross-sectional area for the stock shape — rectangular (width × thickness), round bar (πr²), tube (π(R² − r²)), or plate (length × width × thickness). Multiply by length for total volume.

Volume = Cross-section area × Length

Density by Alloy

Multiply volume by material density. Carbon steel is ~7850 kg/m³ (0.283 lb/in³); aluminum 6061 is ~2700 kg/m³ (0.098 lb/in³); copper is ~8960 kg/m³ (0.323 lb/in³).

Weight = Volume × Density

Unit Conversion

Convert dimensions to consistent units before calculating. For imperial: volume in cubic inches × 0.283 lb/in³ for steel. For metric: volume in cm³ × density in g/cm³ gives grams.

Weight (lb) = Volume (in³) × Density (lb/in³)

Updated: July 2026

Example Scenarios

A 4×8 ft × 1/4 in steel plate has volume ~1152 in³. At 0.283 lb/in³ density, weight is approximately 326 lbs — plan for two-person lift or mechanical handling.

A 2-inch diameter × 72-inch 6061-T6 bar weighs roughly 41 lbs (0.098 lb/in³ × π × 1² × 72). Useful for comparing aluminum vs steel handling on a lathe project.

Hollow structural tube with 2-inch outer, 1.5-inch inner side, 1/4-inch wall over 240 inches. Net steel area yields roughly 130–140 lbs depending on exact corner radii.

Common Mistakes to Avoid

Using outer diameter for tube volume without subtracting the bore

Calculate wall cross-section as outer area minus inner area. Treating a tube as solid bar overstates weight by the ratio of OD² to (OD² − ID²).

Mixing metric dimensions with imperial density constants

Convert all dimensions to one system first. Multiplying mm dimensions by lb/in³ density without converting to inches produces wildly wrong results.

FAQ

Use 7850 kg/m³ or 0.283 lb/in³ for standard carbon steel. Stainless 304 is slightly less dense at ~8000 kg/m³. Alloy steels vary by composition but 7850 is a reliable estimate for ordering.

Subtract the inner cross-section from the outer cross-section to get wall area, then multiply by length and density. A tube weighs substantially less than a solid bar of the same outer diameter.

Galvanizing, paint, and mill scale add negligible weight for most engineering estimates. Hot-dip galvanized coating might add 1–3% on thin sheet. For precision shipping, weigh a sample piece.

Break irregular parts into simple geometric sections, sum their volumes, and apply density. For castings or complex CNC parts, CAD mass properties or physical weighing is more accurate.

Suppliers may use nominal dimensions while actual mill tolerances differ. Length may include end trim. Moisture, rust scale, and alloy lot variation also cause small discrepancies.

About Jewelry Metal Weight Calculator

Estimating metal weight is essential for material ordering, shipping quotes, structural load planning, and shop handling. This calculator computes mass from cross-section dimensions and alloy-specific density for bars, plates, tubes, and other common stock shapes.