How do you calculate line speed capacity?

Multiply panels per cycle by available cycles to get gross capacity, then multiply by uptime and first-pass yield. Here 4 panels x 480 cycles = 1,920 gross, x 90% x 97% = about 1,676 good panels.

What is the difference between gross and good capacity?

Gross capacity is the theoretical 1,920 panels if the line never stopped and everything passed. Good capacity, 1,676 here, is what survives 192 panels of downtime loss and roughly 52 panels of yield loss.

What is a good uptime for a roll-forming line?

Well-managed roll formers run 85-92% uptime across a shift once coil changes, jams, and micro-stops are counted. The 90% default is a realistic target; chronic sub-80% points to tooling or coil-feed problems.

How much output do downtime and scrap cost me?

In this run downtime removes 192 panels and first-pass yield loss removes about 52 panels, so you lose roughly 244 sellable panels versus the 1,920 gross the line could theoretically produce.

Should I use this for capacity planning against demand?

Yes. Plan against good capacity, not gross. Promising 1,920 panels when the line reliably makes 1,676 builds a 244-panel shortfall into every shift and blows through your ship dates.

Why is first-pass yield separate from uptime?

Uptime measures whether the line is running; first-pass yield measures whether running panels pass inspection. A line can be up 90% of the time and still scrap 3% of panels to camber, oil-canning, or paint defects.

Roofing, Siding & Exterior Building Products calculator

Line speed capacity Calculator

Line Speed Capacity converts a roll-forming or press line's raw cycle rate into the number of sellable panels you can actually expect off the end of the shift. Production planners and line supervisors at metal roofing and siding plants use it to set realistic daily targets instead of theoretical machine speeds. By layering uptime and first-pass yield onto gross cycles, it separates the panels the line could make from the good panels it will make. That gap, downtime and scrap, is exactly what a scheduler needs to promise honest ship dates.

What this calculator does

Estimate line speed capacity for roofing, siding and exterior building products using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.
Use it when line speed capacity in roofing, siding and exterior building products is being asked to take on more work and you need to know if there is room.
It computes good (sellable) panel output for a shift by discounting gross cycle capacity for uptime losses and first-pass yield.

Formula used

Gross line speed capacity = line speed capacity output per cycle × available line speed capacity cycles
Good line speed capacity = gross capacity × expected line speed capacity uptime × expected line speed capacity first-pass yield

Inputs explained

Panels formed per press cycle:
Available press cycles in the shift:
Roll-former uptime:
First-pass panel yield:

How to use the result

Use it when setting shift targets, sizing a line against a demand number, or diagnosing why actual output trails the machine's rated speed.
It uses a single blended uptime and yield figure; it will not capture a specific jam-prone profile or a warm-up scrap spike unless you feed it representative averages.

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 line speed capacity? Multiply panels per cycle by available cycles to get gross capacity, then multiply by uptime and first-pass yield. Here 4 panels x 480 cycles = 1,920 gross, x 90% x 97% = about 1,676 good panels.
What is the difference between gross and good capacity? Gross capacity is the theoretical 1,920 panels if the line never stopped and everything passed. Good capacity, 1,676 here, is what survives 192 panels of downtime loss and roughly 52 panels of yield loss.
What is a good uptime for a roll-forming line? Well-managed roll formers run 85-92% uptime across a shift once coil changes, jams, and micro-stops are counted. The 90% default is a realistic target; chronic sub-80% points to tooling or coil-feed problems.
How much output do downtime and scrap cost me? In this run downtime removes 192 panels and first-pass yield loss removes about 52 panels, so you lose roughly 244 sellable panels versus the 1,920 gross the line could theoretically produce.
Should I use this for capacity planning against demand? Yes. Plan against good capacity, not gross. Promising 1,920 panels when the line reliably makes 1,676 builds a 244-panel shortfall into every shift and blows through your ship dates.

Last reviewed 2026-05-12.