How do you calculate scrap trim cost?

Multiply coil feet by cost per foot by the trim scrap rate, then add haul-off. For 5,000 ft at $1.40/ft, a 6% scrap rate and $75 haul-off, that is 5,000 x 1.40 x 0.06 + 75 = $495 total.

What is scrap trim cost per foot?

It is total scrap cost divided by coil feet run. In the example, $495 over 5,000 ft is $0.099 per foot — the amount of scrap cost baked into every linear foot you produce.

What is a good trim scrap rate for a roll-forming line?

Tight coil lines running matched-width coil often hold trim loss to 3-6%. If you are above 8-10%, your coil width is likely mismatched to the profile or your slitting setup is leaving too much edge.

How much of scrap cost is fixed vs variable?

The material trim is variable — $420 in the example, scaling with feet run. Haul-off and handling is the fixed adder, $75 here, that you pay regardless of run length.

How do I reduce scrap trim cost per foot?

Order coil in widths matched to the profile so less edge is trimmed, nest more profiles across the strip, and negotiate scrap rebates so haul-off partly offsets. Lowering the 6% trim rate is the biggest lever on the per-foot figure.

Roofing, Siding & Exterior Building Products calculator

Scrap trim cost Calculator

Scrap Trim Cost quantifies the money lost to edge trim, offcuts, and scrap handling on a coil-fed roofing or siding line. Roll-forming supervisors and estimators use it because every foot of coil carries material cost, and the slitting and trimming that squares up metal panels or siding profiles throws away a predictable percentage of that expensive steel or aluminum — plus you pay to haul the scrap away. Knowing the true scrap trim cost, both total and per foot run, lets you price jobs accurately and target the biggest waste drivers. It turns a fuzzy 'we lose some to trim' into a hard dollar figure you can act on.

What this calculator does

Estimates scrap trim cost on a metal roofing or siding line from coil feet run, material cost per foot, the percent lost to trim and offcuts, and a flat haul-off charge.
A roll-forming supervisor uses it to quantify the dollar value of edge trim, end cuts, and offcut drops on a coil run of standing-seam or lap siding.
It computes total scrap trim cost from coil feet, material cost, trim scrap rate, and fixed haul-off, then divides by coil feet for a per-foot figure.

Formula used

Total scrap trim cost = coil feet x cost per foot x scrap rate + haul-off
Scrap cost per foot run = total / coil feet

Inputs explained

Coil feet run through the line:
Material cost per foot:
Length lost to edge trim & offcuts:
Scrap haul-off & handling:

How to use the result

Use it when quoting a coil run, evaluating a trimming setup change, or allocating scrap cost into product costing.
It treats the trim scrap rate as a flat percentage; real trim loss varies with coil width, gauge, and how many profiles nest across the strip.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.

Common questions

How do you calculate scrap trim cost? Multiply coil feet by cost per foot by the trim scrap rate, then add haul-off. For 5,000 ft at $1.40/ft, a 6% scrap rate and $75 haul-off, that is 5,000 x 1.40 x 0.06 + 75 = $495 total.
What is scrap trim cost per foot? It is total scrap cost divided by coil feet run. In the example, $495 over 5,000 ft is $0.099 per foot — the amount of scrap cost baked into every linear foot you produce.
What is a good trim scrap rate for a roll-forming line? Tight coil lines running matched-width coil often hold trim loss to 3-6%. If you are above 8-10%, your coil width is likely mismatched to the profile or your slitting setup is leaving too much edge.
How much of scrap cost is fixed vs variable? The material trim is variable — $420 in the example, scaling with feet run. Haul-off and handling is the fixed adder, $75 here, that you pay regardless of run length.
How do I reduce scrap trim cost per foot? Order coil in widths matched to the profile so less edge is trimmed, nest more profiles across the strip, and negotiate scrap rebates so haul-off partly offsets. Lowering the 6% trim rate is the biggest lever on the per-foot figure.

Last reviewed 2026-05-12.