Break a structure into parts and calculate total stock, material quantity, waste allowance and approximate weight.
Add each distinct part or repeated component. Use the quantity field for identical pieces.
| Part Name | Section | Qty | Length | Dimension A | Dimension B | Wall / Thickness |
|---|
| Section | Dimension A | Dimension B | Wall / Thickness |
|---|---|---|---|
| Plate / Sheet | Width | — | Thickness |
| Flat Bar | Width | — | Thickness |
| Round Bar | Diameter | — | — |
| Square Bar | Side | — | — |
| Rectangular Bar | Width | Height | — |
| Pipe / Round Tube | Outside Diameter | — | Wall |
| Square Tube | Outside Width | — | Wall |
| Rectangular Tube | Outside Width | Outside Height | Wall |
| Angle | Leg A | Leg B | Thickness |
| Channel | Width | Height | Thickness |
| I-Beam | Flange Width | Overall Height | Common Thickness |
The structure is divided into individual fabrication parts. Each part is converted into a cross-sectional area and multiplied by its length and quantity.
The net material requirement is then increased by the entered waste allowance.
For material weight, volume is multiplied by the entered density.
For linear sections such as bars, tubes, angles, channels and beams, the calculator totals the required part lengths and applies the waste allowance.
This gives a purchasing estimate rather than a cutting-optimization result.
Consider a simple fabricated frame containing:
The calculator keeps these as separate line items, calculates the geometry of each section and then combines them into the project total.
This approach makes the takeoff easier to review because the total material can be traced back to the individual fabrication components.
Waste can come from cutting kerf, end trimming, unusable remnants, damaged material, fabrication errors and inefficient nesting.
The waste field is an overall estimating allowance and should not be interpreted as an exact cutting-loss calculation.
For expensive alloys or high-volume production, a detailed cutting plan should be prepared before purchasing material.
What is a fabrication material takeoff? It is a breakdown of a structure into individual parts showing the material and quantity required for fabrication.
Can I calculate plates and structural sections in the same project? Yes. Each row can use a different section type.
Can I calculate tube weight? Yes. Enter the outside dimensions, wall thickness, length and quantity. The hollow section area is calculated automatically.
What density should I use for carbon steel? A commonly used estimating value is about 7.85 g/cm³.
Does the waste percentage affect stock quantity? Yes. It increases the estimated gross requirement.
Does the stock calculation optimize cuts? No. It estimates the number of stock lengths from total required length. Individual cut nesting is a separate problem.
Can this be used for aluminum? Yes. Change the density to the appropriate aluminum alloy density and use the correct section dimensions.
Why might the calculated weight differ from a steel supplier's weight? Simplified geometry does not include the exact radii, fillets and tolerances present in commercial rolled sections.