Scrap, Trim & Yield — How to Calculate Real Landed Cost of Slit Coil

But that is not your real cost.

Many buyers compare coil quotes based on:

Price per ton.

But that is not your real cost.

Your real cost is:

Cost per usable kilogram after slitting, trim, scrap, and production losses.

Ignoring yield distortion leads to:

• False price comparisons
• Underestimated job costing
• Margin erosion
• Unexpected scrap cost

This guide explains how to calculate:

• True landed cost
• Effective cost per usable width
• Yield-adjusted cost per kg
• Scrap-adjusted profit margin

This is commercial engineering — not just math.

1. The Basic Problem

You buy:

1 master coil @ £900 per metric ton.

But after slitting and trim:

You only use 95% of that material.

Your true material cost is no longer £900/ton.

It is:

£900 ÷ 0.95 = £947/ton effective.

That difference destroys margin at scale.

2. Understanding Yield

Yield % =
(Usable width ÷ Master width) × 100

But real yield must include:

• Trim loss
• Knife kerf loss
• Edge discard
• Production scrap

Total yield is always lower than theoretical layout yield.

3. Components of Real Yield Loss

A) Edge Trim

Typical trim: 5–15 mm per coil.

This is permanent loss.

B) Knife Kerf

Material removed by blade thickness.

Small but cumulative.

C) Setup Scrap

First few meters during setup often scrapped.

D) Production Scrap

• Forming defects
• End-of-coil waste
• Damaged wraps

All must be included in calculation.

4. Real Landed Cost Formula

True usable cost per ton =

(Total landed cost) ÷ (Total usable yield %)

Step-by-Step Example

Step 1 — Purchase Cost

• Coil price: £900/MT
• Freight: £50/MT
• Import duties: £20/MT

Total landed = £970/MT

Step 2 — Slitting Yield

• Master coil: 1250 mm
• Slit layout total usable: 1200 mm
• Trim: 20 mm
• Kerf: 10 mm

Usable width = 1200 mm
Yield = 1200 ÷ 1250 = 96%

Step 3 — Production Scrap

Assume additional 2% scrap in forming.

Total effective yield:

96% × 98% = 94.08%

Step 4 — True Cost

£970 ÷ 0.9408 = £1,031 per usable ton

Your real material cost is £1,031 — not £970.

That is a £61 difference per ton.

Multiply across 2,000 tons annually.

That’s £122,000 impact.

5. Scrap Recovery Value

Scrap has resale value.

Example:

Scrap sold at £250/MT.

If scrap equals 6%:

6% of £970 = 0.06 × 970 = £58.20 lost value
Recovered at 250 = 0.06 × 250 = £15

Net scrap loss = £43.20

Scrap revenue reduces impact — but does not eliminate it.

Never treat scrap as profit.

6. Comparing Two Coil Quotes Correctly

Supplier A: £900/MT
Yield 94%

Supplier B: £920/MT
Yield 98%

Real cost comparison:

A: 900 ÷ 0.94 = £957
B: 920 ÷ 0.98 = £939

Supplier B is cheaper in reality.

Yield matters more than headline price.

7. Yield Sensitivity Analysis

Every 1% yield loss increases cost significantly.

Example:

£1,000 coil

• At 99% yield → £1,010 effective
• At 95% yield → £1,053 effective
• At 90% yield → £1,111 effective

Small yield changes have large financial impact.

8. Slit Width Optimization Impact

Better layout planning improves yield.

Example:

94% vs 98% yield difference on 5,000 tons:

4% difference = 200 tons waste.

At £1,000 per ton = £200,000 impact.

Yield planning is a profit lever.

9. Hidden Yield Killers

• Unplanned narrow leftovers
• Poor slitting tolerance
• High burr causing edge trim
• Excess camber causing scrap
• Damage during handling
• Incorrect coil ID causing setup scrap

Operational discipline improves real cost.

10. Inventory & Cash Flow Impact

Lower yield means:

• More tons purchased for same output
• More cash tied in inventory
• Higher storage cost
• Higher handling cost

Yield optimization improves cash conversion cycle.

11. Including Processing Costs

Real landed cost must include:

• Slitting cost per ton
• Transport to plant
• Insurance
• Handling

Adjusted formula:

(Landed cost + processing cost) ÷ usable yield

Example:

£970 landed + £35 slitting = £1,005 ÷ 0.94 = £1,069 usable cost.

12. When Yield Optimization Is Worth Investment

Investment in:

• Better slitting line
• Yield planning software
• Production forecasting
• Knife maintenance

May improve yield by 2–3%.

Return on investment often immediate at scale.

13. The “Cheap Coil Trap”

Low-cost supplier may:

• Offer low price
• But poor slitting quality
• Higher scrap
• Higher camber
• Higher burr

Effective cost becomes higher than premium supplier.

Always compare yield-adjusted cost.

14. Tracking Yield KPI

Professional operations track:

• Yield per master coil
• Yield per product family
• Scrap % per job
• Cost per usable kg

Yield should be a dashboard KPI.

FAQ Section

Should scrap value be included?

Yes, but cautiously.

Is yield more important than price?

Often yes.

Does slitting quality affect yield?

Absolutely.

Should I calculate effective cost per usable kg?

Yes.

Can 2% yield improvement matter?

Massively at scale.

Is trim loss unavoidable?

Yes.

Should forming scrap be included?

Yes.

Is scrap revenue profit?

No — it offsets loss.

Can better layout reduce cost?

Yes.

Should yield be tracked monthly?

Ideally weekly.

Conclusion

The price per ton on your invoice is not your real cost.

Your real cost is:

Cost per usable kilogram after:

• Trim
• Scrap
• Slitting
• Forming
• Handling

Ignoring yield distortion leads to:

• Margin loss
• Bad supplier decisions
• Incorrect quoting

Professional buyers:

• Calculate yield-adjusted cost
• Compare suppliers on usable cost
• Track scrap %
• Optimize layout planning
• Include processing in landed cost

Scrap and trim are not minor factors.

They are profit drivers.

Control yield — control margin.