Metal Weight Calculator
Weight (lbs)
2.84
How it works
Metal weight calculation is essential for shipping cost estimates, structural load planning, and material ordering. The Metal Weight Calculator computes weight from material dimensions and alloy density for steel, aluminum, copper, brass, and other common metals.
**Density reference** Mild/carbon steel: 490 lb/ft3 (7,850 kg/m3). Stainless steel 304: 501 lb/ft3 (8,030 kg/m3). Aluminum 6061: 169 lb/ft3 (2,700 kg/m3). Copper: 559 lb/ft3 (8,960 kg/m3). Brass: 534 lb/ft3 (8,550 kg/m3). Titanium grade 2: 282 lb/ft3 (4,510 kg/m3).
**Common shapes** Flat bar: weight = width x thickness x length x density. Round bar: weight = (pi/4) x diameter squared x length x density. Hollow tube: weight = (pi/4) x (OD squared minus ID squared) x length x density. Weight per foot for standard structural shapes is listed in AISC Steel Construction Manual tables.
**Practical applications** For shipping: a 2x4 foot, 1/4-inch steel plate weighs approximately 40 lbs. For structural loading: multiply member weight per foot by total length to get self-weight load. Aluminum is 2.9 times lighter than steel by volume but costs 3 to 5 times more per pound.
**Unit conversions** 1 kg/m3 = 0.0624 lb/ft3. Standard structural steel shapes are specified by weight per linear foot (for example, W8x31 = 31 lbs per foot wide-flange beam).
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Frequently Asked Questions
- Metal density varies slightly with alloy composition, heat treatment, and measurement method. The density listed in tables is the theoretical value for the pure alloy — actual plate, bar, and tube stock may vary by ±2–3% due to manufacturing tolerances. More commonly: apparent weight differences between suppliers come from tolerances in thickness and width. A plate ordered as 1/4 inch thick (0.250 inch) may be produced anywhere from 0.236 to 0.266 inch and still be within ASTM specification. A 4×8-foot plate with 0.010 inch extra thickness weighs approximately 1.5% more than calculated. Always use calculated weight as an estimate; weigh actual stock for precise requirements.
- Standard structural steel shapes have standardized weight-per-foot values published in the AISC Steel Construction Manual (free to view online) and many engineering handbooks. The designation tells you the weight: W8×31 is a wide-flange beam, 8 inches deep, weighing 31 lbs per foot. L3×3×1/4 is an equal-leg angle, 3 inches per leg, 1/4-inch thick, weighing approximately 4.9 lbs/ft. For quick reference, most metal supplier websites list weight per foot in their product specifications. For unusual shapes or non-US standards (European wide-flange = HEA/HEB, channels = UPN), consult the appropriate national steel design manual or the supplier's product datasheet.
- Sheet metal weight per square foot: 16-gauge mild steel (0.0598 inch) = 2.5 lbs/sq ft. 14-gauge (0.0747 inch) = 3.1 lbs/sq ft. 11-gauge (0.1196 inch) = 5.0 lbs/sq ft. 7-gauge (0.1793 inch) = 7.5 lbs/sq ft. 1/4-inch plate = 10.2 lbs/sq ft. 1/2-inch plate = 20.4 lbs/sq ft. For aluminum (gauge = thickness, different standard): 0.040 inch aluminum = 0.56 lbs/sq ft. 0.063 inch = 0.88 lbs/sq ft. 0.090 inch = 1.26 lbs/sq ft. Note: 'gauge' means different thicknesses for steel vs. aluminum — always specify thickness in inches for precision to avoid confusion. Sheet metal gauge charts are printed on the reference page of most metal supplier websites.
- Calculate the gross weight of the full sheet or bar, then subtract the weight of each cutout. Each cutout's weight = area of cutout × material thickness × density. For circular holes: area = π × radius². For rectangular cutouts: area = length × width. Example: a 48×96-inch steel plate 1/4 inch thick has gross weight = 48 × 96 / 144 × 10.2 = 326 lbs. Two 12-inch diameter holes weigh: 2 × π × 6² / 144 × 10.2 = 2 × 113 / 144 × 10.2 = 16 lbs. Net weight ≈ 326 − 16 = 310 lbs. For highly perforated material (perforated sheet), manufacturers list a 'percent open area' — multiply gross weight by (1 − percent open area) for net weight.