per kg
Used for cost estimation per row and total.
| # | Shape | Grade | Density (kg/m³) |
Dimensions | Length | Qty | Waste % |
Weight (kg) |
Cost est. |
|---|
Total weight: 0.000 kg
Total cost (est.): 0.00
Supported shapes
- Sheet / Plate
- Flat Bar
- Round Bar
- Square Bar
- Rectangular Bar
- Hex Bar (across flats)
- Round Pipe / Tube
- Rectangular Tube
- L‑Angle (legs A × B × t)
Grade defaults
Typical densities (edit any row as needed):
- 201: 7800 kg/m³
- 304 / 304L: 7930 kg/m³
- 316 / 316L: 7980 kg/m³
- 410: 7750 kg/m³
- 430: 7700 kg/m³
- Duplex 2205: 7800 kg/m³
- Custom: enter any density
Example data table
| # | Shape | Grade | Density (kg/m³) | Dimensions | Length (m) | Qty | Waste % | Weight (kg) |
|---|---|---|---|---|---|---|---|---|
Examples assume dimension unit = mm.
Formulas used
All volumes use SI (meters); convert inputs first. Weight (kg) = Volume (m³) × Density (kg/m³).
- Sheet / Plate:
V = (t × w × L). - Flat / Rectangular Bar:
V = (b × h × L). - Square Bar:
V = (a² × L). - Round Bar:
V = (π × (d/2)² × L). - Hex Bar (across flats F):
Area = (√3/2) × F²,V = Area × L. - Round Pipe (OD, thickness t):
V = π × ( (OD/2)² − ( (OD−2t)/2 )² ) × L. - Rectangular Tube (b × h × t):
V = (b × h − (b−2t) × (h−2t)) × L. - L‑Angle (legs A, B, thickness t):
Area = t × (A + B − t),V = Area × L.
How to use
- Select dimension and length units before adding rows.
- Click Add row, choose a shape, and enter dimensions.
- Pick a grade to auto‑fill density, or enter a custom value.
- Enter length and quantity; optionally add waste percentage.
- Set unit cost per kg to estimate costs automatically.
- Totals update instantly; edit any field to recalculate.
- Export your line items as CSV or a formatted PDF.
FAQs
Common grades like 201, 304/304L, 316/316L, 410, 430, and Duplex 2205 are included. You can switch any row to Custom and specify a density.
Weights are theoretical, using ideal geometry and nominal density. Real products vary with tolerances, finishes, and mill certificates. Consider adding sensible waste allowances.
Yes. Choose inches for dimensions and feet for length. The calculator converts to SI internally before computing volumes and weights.
Using across‑flats measurement F: Area = (√3/2) × F². This relates the inscribed circle to a regular hexagon’s geometry.
Enter your price per kilogram in the Unit cost box. Each row and totals will include estimated cost values.
It increases the theoretical weight by the given percentage to account for offcuts, kerfs, test pieces, or fabrication losses.
Use the CSV button for spreadsheets, or the PDF button to create a clean summary for quotes or shop travelers.