FREE CNC TOOL · Stock estimating
Metal Weight Calculator (Plate / Round Bar / Tube / Hex Bar)
Pick a shape and material, enter the dimensions, and get the weight each and total weight instantly. All calculations run locally in your browser.
Weight = volume × density. Densities use common engineering values (g/cm³); different grades and heat-treatment conditions vary slightly. When estimating stock, add extra allowance for saw-cutting and clamping.
Common material density table
| Material | Density (g/cm³) | Notes |
|---|---|---|
| Aluminum alloy 6061 | 2.70 | Most common structural aluminum |
| Aluminum alloy 7075 | 2.81 | Aerospace-grade high strength |
| Carbon steel S45C / tool steel | 7.85 | General value for common steel |
| Stainless steel 304 | 7.93 | — |
| Stainless steel 316 | 7.98 | Higher corrosion resistance |
| Titanium alloy Ti-6Al-4V | 4.43 | About 56% the weight of steel |
| Pure copper | 8.96 | — |
| Brass C3604 | 8.50 | — |
| POM (acetal) | 1.41 | — |
| Acrylic PMMA | 1.19 | — |
FAQ
How much does a 100×100×10 mm aluminum plate weigh?
Volume 100 cm³ × density 2.70 = 270 g. A steel plate of the same size is about 785 g—aluminum is roughly a third of the weight of steel.
Why add allowance when estimating stock?
Saw-cut loss, clamping area and facing allowance all eat into material. A common practice: add 5–10 mm to length and width and 2–5 mm to thickness, then adjust for the part and workholding method.
Further reading: Machining cost breakdown (how material cost is calculated) · Aluminum machining guide | More tools: Cutting parameter calculator · Tap drill chart
FROM WEIGHT TO QUOTE
From stock estimate to quote—AI can complete it automatically after reading the drawing
Once BestAI CAM reads the drawing and builds the model, it automatically computes stock volume and machining features to support fast quote evaluation.
See how to get started