Sheet Metal Nesting Yield Calculator
Nesting yield is the share of a sheet that ends up as good parts. A few points of yield on stainless or thick plate often outweigh the cost of an extra hour of programming. This calculator converts a nest result into yield, scrap and cost per part.
Your numbers
Gross outline area of the part, before holes are removed.
Your results
Part area and parts per sheet should come from your nesting software. This tool does the economics, it does not generate a nest. Kerf, remnants and common-line cutting are not modeled.
Yield and material cost per part vs parts per sheet
Sweeps Parts per sheet (from your nest) from 10 to 60, holding your other inputs fixed.
Track remnants and sheet stock in your ERP
Optional: a short review of how remnants and nest results could flow into inventory and costing.
Optional. The tool and every export work without this. No spam.
How to use the calculator
Enter the sheet size, edge margin, thickness and material density, then the gross area of one part and the number of parts in your nest. Add the sheet price per kg and the scrap sale price. The tool returns yield on the full sheet and on the usable area, the scrap share, sheets required for your order quantity, and material cost per part net of scrap credit. Use the chart to see how adding parts to a nest improves yield and reduces material cost.
- Read the part area from CAD or the nesting report.
- Use the parts per sheet count of the nest you actually plan to cut.
- Compare two nests by changing only the part count.
Formulas used
Yield equals parts per sheet times part area divided by sheet area. Scrap is 100 percent minus yield. Sheet weight is length times width times thickness times density, converted to kilograms. Sheets required is the order quantity divided by parts per sheet, rounded up. Material cost per part is sheet cost minus scrap credit, divided by parts per sheet. Yield on usable area excludes the unusable edge margin, which is how many nesting packages report utilization.
- Gross part area ignores holes, which become scrap inside the part.
- Mixed nests need a weighted calculation across part types.
Example and how to read it
On a 3000 by 1500 mm sheet, 36 parts of 60,000 mm2 each give about 48 percent yield and 52 percent scrap. A 2 mm carbon steel sheet weighs about 70.7 kg, and for 500 parts you need 14 sheets. If a better nest fits 44 parts, yield rises to about 59 percent and sheets fall to 12. The saving comes from material, handling and machine time together, so compare complete costs, not yield alone.
- Low yield may be acceptable on cheap material and long cut times.
- A common-line nest may raise yield and shorten cutting.
Common mistakes
Using net part area, which excludes holes, makes yield look worse than the sheet actually behaves. Ignoring the margin makes yield look better than the machine can deliver. Ordering by quantity without rounding up to full sheets underestimates stock. Remnants may have value if they are stocked and reused, but only if the ERP tracks them as inventory. Otherwise the scrap credit is the realistic number.
- Track usable remnants as inventory, not as scrap.
- Re-nest when order quantities change.
Frequently Asked Questions
What is a good nesting yield for sheet metal?
It depends on part shapes. Rectangular parts can exceed 85 percent, while irregular parts often land between 60 and 80 percent. Compare against your own history for similar part families rather than a universal target.
How is nesting yield calculated?
Divide the total area of the parts on the sheet by the sheet area and multiply by 100. Some software uses the usable area inside margins instead, so check which basis a report uses before comparing numbers.
Does kerf matter?
For laser cutting the kerf is small, but it affects tight common-line nests and spacing between parts. This calculator does not model kerf, so leave the spacing to the nesting software.
Should I include scrap credit?
Yes, if you sell or recycle the scrap. It reduces net material cost, but it is usually a small fraction of purchase price, so it does not make up for a low yield.
If remnants, sheet inventory and nest results sit outside your ERP, Netray can help connect them so material planning reflects what is on the rack.
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