# How to Calculate Coil and Scrap Cost in Metal Stamping

> Source: https://netray.co/resources/how-to-calculate-coil-and-scrap-cost-in-stamping
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Knowledge Base

## Short answer

Calculate coil cost per part in stamping: blank weight, yield, carrier loss, scrap credit, steel surcharges and how to track real utilization from the floor.

## Category

erp-general

## Content

**Intro:** Coil cost per part equals the weight of strip consumed per good piece times the price per pound, minus scrap credit, plus surcharges and processing. The common mistake is using blank weight alone: strip pitch, carrier, skeleton, coil ends and rejected parts all consume steel that never ships. For many stampers material is more than half of the piece price, so a two or three point yield error matters more than most labor assumptions. This guide shows the formula, the losses people forget, and how to measure actual utilization.

**Sections:**

#### The Basic Formula

**Body:** Start with strip consumption per part: pitch times strip width times gauge times material density gives weight per stroke, divided by parts per stroke. Multiply by price per pound for the coil as purchased, including gauge, width and coating extras, slitting charges and freight. Then subtract scrap credit on the weight that comes out as scrap. Steel density is about 0.284 pounds per cubic inch, aluminum about 0.098, so check the alloy rather than assuming. Pricing for steel is often index-based or carries a surcharge, so build a field for the price date, not a fixed number, and revisit quotes when contracts allow a pass-through.

**Bullets:**

- Weight per stroke = pitch x width x gauge x density
- Cost per part = weight per part x delivered coil price per pound
- Net material = cost per part minus scrap credit on engineered scrap
- Add slitting, edge condition, coating and freight to the coil price

#### Losses That Are Not in the Blank Weight

**Body:** Utilization is finished part weight divided by strip weight consumed, and it usually falls below the layout number once real production starts. Coil starts and ends leave short scrap pieces that cannot feed. Setup and tryout consume strip before the first good part. Reject and sort losses scale with scrap rate, and parts reworked or held for containment still consumed material. Edge wave, camber, and coil set variation in the incoming coil can force pitch adjustment or lost production. Finally, a heat or lot change mid-run can strand a partial coil. A quote based on layout yield without a shop-floor allowance for these is optimistic on day one.

#### Scrap Credit Without Fooling Yourself

**Body:** Scrap is sold, not free money. Engineered scrap (slugs, skeleton, trim) is typically segregated by material and sold at a price below what you paid, and the gap depends on the market, grade, cleanliness and volume. Mixed alloy or contaminated scrap sells for less, and coated steel or aluminum may have its own rules. Many stampers credit scrap in the part price at the actual recent recovery rate, and some customers' contracts specify who owns the scrap. Do not credit scrap at purchase price; model it at the real resale, and update when your scrap hauler's pricing changes.

#### Measuring Real Utilization From the Floor

**Body:** The way to verify the estimate is to compare coil weight issued to a job against good-part weight produced and scrap weighed. That needs discipline at three points: coil weight at issue, the remaining weight returned, and good piece counts at the end of each run. In ERPs such as Epicor, Plex, DELMIAworks or SyteLine this means material issue transactions, return-to-stock, and scrap reporting with reason codes. Where this is done by hand on paper, utilization data is usually thin or unreliable. Fixing the data capture is more valuable than any analysis built on weak numbers.

**Bullets:**

- Weigh or log coil at issue and the remaining coil on return
- Report scrap by reason code: setup, die, material, operator
- Compare actual utilization with quoted utilization by part number

#### When Precision Is Not Worth the Effort

**Body:** For low-volume parts with cheap material, tracking coil to the pound may cost more than it saves. Focus your measurement on high-volume programs, expensive alloys such as stainless, copper or pre-plated strip, and customers who audit material. A mid-sized stamper with a hundred active part numbers might measure utilization monthly on the top twenty by material spend and review the rest quarterly. AI can help by flagging jobs where actual weight consumed is out of line with history, but it cannot fix missing transactions.

**Cta:** Netray can build a read-only view over your ERP that compares quoted and actual coil utilization by part, press and material lot.

**Faq:**

#### How do you calculate material yield in stamping?

**Answer:** Divide the finished part weight by the weight of strip consumed per good part. Strip weight uses pitch, width, gauge and density, and should be adjusted for coil-end losses, setup and tryout material, and reject losses. Layout yield from the die designer is the ceiling, and actual utilization from production is the number to quote with.

#### Should scrap credit be included in a stamping quote?

**Answer:** Yes, but at realistic resale value, not at the purchase price. Segregated engineered scrap sells at a discount to coil cost, and mixed or contaminated scrap fetches less. Check your customer contract too, since some customers claim scrap ownership or require a specific treatment.

#### How do steel price changes affect stamping quotes?

**Answer:** Because material is often the largest cost line, shops commonly use index-based pass-through clauses or surcharges agreed with customers, and update quotes when contracts allow. Without a clause, a price swing in coil can erase margin on long programs, so store the price date used in each quote.

## Related Slugs

- syteline-production-costing-configuration
- syteline-backflush-configuration-guide
- ai-inventory-optimization-manufacturing
- syteline-kpi-manufacturing-metrics

## Search terms

stamping coil cost calculation, material yield stamping, scrap cost metal stamping, coil utilization stamping, stamping material cost per part, steel surcharge stamping quote

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