Construction Products, Windows, Doors & Fenestration worked example

Window Line Throughput at 60% window line uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop window line uptime to 60%, then walk the calculation through step by step. Estimate good window production capacity from units per cycle, planned cycles, uptime, and first-pass yield.

The inputs for this scenario

  • finished windows per production cycle: 6 windows / cycle (held at the documented default)
  • planned window production cycles: 92 cycles (held at the documented default)
  • window line uptime: 60 % (the input this scenario stresses; the baseline uses 83)
  • window first-pass yield: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross window line capacity = finished windows per production cycle × planned window production cycles.
  • good windows per shift works out to 318 windows at these inputs, and this is the headline figure for the scenario.
  • gross window line capacity works out to 552 windows at these inputs.
  • windows lost to downtime works out to 221 windows at these inputs.
  • windows lost to first-pass yield works out to 13.25 windows at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where window line uptime sits at 83% and the headline result is 440 windows, this scenario comes in 27.71% below the baseline at 318 windows.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to window line uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes uptime and yield are independent and steady across the shift; a single bad glass lot or a long unplanned line-down event will break that assumption and the real number will fall short.

Results at a glance

  • good windows per shift: 318 windows (headline result)
  • gross window line capacity: 552 windows
  • windows lost to downtime: 221 windows
  • windows lost to first-pass yield: 13.25 windows

Run it with your numbers

  • To rerun this with your own numbers, open the live Window Line Throughput calculator, set window line uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.