Estimate mass from a metal section, length and piece count. Use the preset density or enter the exact alloy density, then compare the result with your supplier mass table.
A 100 x 50 x 3 mm tube has an inside rectangle of 94 x 44 mm. Its ideal section area is 5000 - 4136 = 864 mm2. At 7850 kg/m3, the calculated mass is 6.7824 kg/m.
Three pieces, each 2 m long, give 40.6944 kg. At a price of 2.50 per kg, the estimate is 101.74 in your chosen currency, excluding delivery and other charges. Real rounded-corner stock can differ from this ideal-section result.
For 100 mm wide, 3 mm thick and 1 m long C26000 brass, enter a custom density of 8530 kg/m3. The estimate is 2.559 kg each, or 5.118 kg for two pieces.
Cross-section area x length x density gives mass. With dimensions converted to metres and density in kg/m3, the result is kilograms. Multiply by the whole-number piece count for the total.
The metal presets are approximate starting values, not specifications for every alloy. Enter the density from your alloy data sheet in the custom field when you have it. For example, the Copper Development Association lists C26000 brass specific gravity as 8.53, corresponding to approximately 8530 kg/m3.
Round tube area is pi/4 x (outside diameter squared - inside diameter squared). Rectangular tube area is outer width x outer height minus the inner rectangle. The wall thickness is removed from both sides of each inside dimension.
This calculator uses ideal sharp corners. Real tube corner radii, angle fillets, seams, dimensional tolerances, finishes and alloy density can change the actual mass. Use the supplier section table when those details matter; no fixed accuracy percentage is promised.
The cross-section keeps the proportions of your entered dimensions. Sheet and flat bar use width and thickness; rectangular tube uses outside width and height; angle uses both outside leg lengths. Very thin sections may be difficult to see at screen scale.
No. This estimates material mass only. Section strength and equipment capacity require their own specifications and checks.
Material references: Copper Development Association: C26000 and Atlas Steels product reference manual. Select the data for your actual grade and section.
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