Sheet Metal Scrap Credit and Net Material Cost Calculator
Material is usually the largest line in a sheet metal quote, and the skeleton left after cutting is not worthless. This calculator turns sheet size, thickness and nest count into utilization, scrap credit and a net material cost per part.
Your numbers
Density used for weight.
Area of the part after holes and cutouts are removed.
What the scrap dealer pays for the skeleton.
Your results
Uses nominal density and thickness. Real sheet weight varies with thickness tolerance and coating. Parts per sheet comes from your nest, so check that it is achievable.
Material cost per part vs parts per sheet
Sweeps Parts per sheet from 100 to 300, holding your other inputs fixed.
Nest utilization from ERP data
Interested in comparing quoted and actual material utilization by job? Tell us how you track it. Optional.
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How to use it
Enter the sheet size, thickness and material, then the net blank area of one part and how many parts your nest places on a sheet. Add the purchase price per kilogram and what your scrap dealer pays. The calculator returns sheet weight, net part weight, utilization, scrap weight and both gross and net material cost per part. Use net blank area, which excludes holes and cutouts, to match the weight of the finished part. Test different nests to see how a single extra part per sheet changes cost.
The method
Weight in kilograms is length x width x thickness in millimetres, times density in g/cm3, divided by 1,000,000. Utilization is parts per sheet x part weight divided by sheet weight. The skeleton is the difference between sheet and total part weight. Net cost is sheet cost minus skeleton weight x scrap price, divided by parts per sheet. Whether to quote on gross or net cost is a commercial choice. Some shops credit scrap to the customer on dedicated material, while others retain it to cover handling.
- Weight = L x W x t x density / 1,000,000
- Utilization = parts x part weight / sheet weight
- Net per part = (sheet cost - scrap credit) / parts
Reading the result and common mistakes
With a 50 percent nest, half the sheet is skeleton, so the scrap credit can offset a meaningful part of the cost when the scrap price is high relative to the purchase price. Aluminium and stainless scrap hold much more value than carbon steel. Common mistakes include using gross part area with holes included, ignoring kerf and part spacing when estimating the nest count, and forgetting that remnants may be reusable rather than scrapped. Track actual utilization from your ERP and compare it with quoted assumptions.
Frequently Asked Questions
What is a good material utilization for sheet metal?
It depends heavily on part shape. Compact parts nested well can exceed 80 percent, while irregular or large parts may sit near 50 to 60 percent. Compare against your own job history rather than a single target.
Should scrap credit be passed to the customer?
It is a commercial decision. Many quotes use net cost when material is bought for the job, and some contracts require scrap to be credited. Check the customer agreement.
How do I handle remnants?
If a remnant is stocked and reused, value it at purchase price less a handling allowance rather than scrap price, and track it in inventory so the cost is not lost.
Does this include kerf?
Kerf is not modelled directly. Include it by reducing the achievable parts per sheet or by using the nesting software count, which accounts for spacing and kerf.
If material standards, remnants and scrap returns live in separate files, we can help bring them into your ERP so costing reflects what really happens at the saw and the laser.
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Guides
- ERP for Metal Fabricators: What the System Must HandleERP for metal fabricators and sheet metal shops: nested material, multi-level BOMs, heat number traceability, outside processing, and shop floor data.
- How to Calculate Coil and Scrap Cost in Metal StampingCalculate coil cost per part in stamping: blank weight, yield, carrier loss, scrap credit, steel surcharges and how to track real utilization from the floor.
- AI for Sheet Metal Fabrication Shops: What Works TodayWhere AI helps a fabrication shop today: reading RFQs and prints, checking quotes against past jobs, answering ERP questions, and flagging late jobs.
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