Contract Manufacturing, Job Shop Quoting & Make-to-Order worked example

Job Shop Capacity at 56% expected shop uptime: a worked example

Suppose expected shop uptime falls to 56%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate good-part capacity for a job shop or make-to-order work center.

The inputs for this scenario

  • Parts per scheduled production slot: 24 parts / slot (held at the documented default)
  • Available production slots: 160 slots (held at the documented default)
  • Expected shop uptime: 56 % (the input this scenario stresses; the baseline uses 78)
  • Expected first-pass yield: 94 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: gross scheduled job-shop capacity = parts per scheduled production slot × available production slots.
  • good job-shop capacity works out to 2,021 parts at these inputs, and this is the headline figure for the scenario.
  • gross scheduled job-shop capacity works out to 3,840 parts at these inputs.
  • capacity lost to uptime limits works out to 1,690 parts at these inputs.
  • capacity lost to scrap and rework works out to 129 parts at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected shop uptime sits at 78% and the headline result is 2,815 parts, this scenario comes in 28.21% below the baseline at 2,021 parts.
  • It computes good (sellable) job-shop capacity by multiplying gross scheduled capacity by expected uptime and first-pass yield, and breaks out the parts lost to each. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • good job-shop capacity: 2,021 parts (headline result)
  • gross scheduled job-shop capacity: 3,840 parts
  • capacity lost to uptime limits: 1,690 parts
  • capacity lost to scrap and rework: 129 parts

Run it with your numbers

  • To rerun this with your own numbers, open the live Job Shop Capacity calculator, set expected shop uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.