Outdoor Power Equipment worked example

Assembly Line Throughput at 99% assembly line uptime: a worked example

What does the result look like when assembly line uptime reaches 99%? The full calculation is worked below with real intermediate numbers. an assembly supervisor needs realistic line throughput per shift to balance the line against takt and demand

The inputs for this scenario

  • Units off line per cycle: 5 units / cycle (unchanged)
  • Available assembly cycles: 450 cycles (unchanged)
  • Assembly line uptime: 99 % (raised for this scenario; the documented default is 91)
  • End-of-line first-pass yield: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross assembly throughput = units off line per cycle × available assembly cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 2,138 units for good units off line per shift, the number this scenario is built around.
  • At this operating point the engine returns 2,250 units for gross assembly throughput.
  • At this operating point the engine returns 22.5 units for assembly downtime loss.
  • At this operating point the engine returns 89.1 units for end-of-line yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where assembly line uptime sits at 91% and the headline result is 1,966 units, this scenario comes in 8.79% above the baseline at 2,138 units.
  • A figure at this level is achievable when assembly line uptime is genuinely sustained, not just peaked for a shift. It models a single balanced line with one bottleneck rate; on a line with multiple stations and buffers, the true constraint may shift, so validate the per-cycle rate against the actual slowest station.

Results at a glance

  • Good units off line per shift: 2,138 units (headline result)
  • Gross assembly throughput: 2,250 units
  • Assembly downtime loss: 22.5 units
  • End-of-line yield loss: 89.1 units

Run it with your numbers

  • Every input above is editable in the live Assembly Line Throughput calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.