SYZ ENGINEERING PRELIMINARY DESIGN TOOL · REFERENCE-BASED ESTIMATE
Material Weight & Cost Estimator
Estimate raw stock weight (and cost, if you enter a price) for round bar, tube or hex bar in common SYZ materials.
RAW STOCK ESTIMATION · DENSITY × VOLUME
Material Weight & Cost Estimator
Estimates raw stock weight (and cost, if you enter a price) for round bar, tube or hex bar in common SYZ materials.
[mm]
[mm]
Typical Density
[USD/kg]
Estimated Stock Weight
1,156 g
≈ 2.55 lb
✔
Raw stock weight — does not subtract machined-away material for a finished part.
Engineering Model (geometry × density)
Calculation Method
Round: V=π/4·D²·L · Tube: V=π/4·(Do²−Di²)·L · Hex: V=(√3/2)·AF²·L
Weight = Volume × Density.
Standard Reference
Standard solid-geometry formulas — densities are typical published mill values, not a certified material specification.
Assumptions & Limitations
- Estimates raw stock weight (the bar/tube before machining) — a finished machined part will weigh less.
- Densities are typical published values; actual mill certs can vary slightly by alloy lot.
- Cost estimate (if entered) is raw material cost only — does not include machining, finishing, or scrap allowance.
STATIC REFERENCE DATA
Reference: Density by Material
Precomputed values from the exact formula used above — useful as a quick lookup without re-entering inputs.
| Material | Density (g/cm³) | 25mm × 300mm Round Bar Weight |
|---|---|---|
| 6061-T6 Aluminum | 2.70 | 398 g (0.88 lb) |
| Ti-6Al-4V Titanium | 4.43 | 652 g (1.44 lb) |
| 4130/4140 Steel (calculator default) | 7.85 | 1,156 g (2.55 lb) |
| 304 Stainless Steel | 8.00 | 1,178 g (2.60 lb) |
WORKED EXAMPLE
Estimating Raw Stock for a Batch of Rod End Bodies
A production run needs 25mm round 4130 bar stock, 300mm per part, and material is quoted at $4.50/kg.
- Volume = π/4 × 25² × 300 = 147,262 mm³ = 147.26 cm³.
- Weight = 147.26 × 7.85 g/cm³ ≈ 1,156 g (2.55 lb) per raw blank.
- Material cost per blank ≈ 1.156 kg × $4.50/kg ≈ $5.20 — raw stock only, before machining/scrap allowance.
- For a 500-piece run, that’s roughly 578 kg of raw bar and ≈$2,600 in material cost alone — useful for a first-pass BOM estimate before quoting.
Related reading: Metallurgy & Quality Control →
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