How do I calculate good tested units?

Multiply units per test cycle by planned cycles, then multiply by uptime and by first-pass yield as fractions. At the defaults, 4 × 155 = 620 gross, 620 × 0.88 = 545.6 after uptime, and 545.6 × 0.97 = 529.232 good units.

Why is good tested units lower than gross capacity?

Uptime removes the units the station could not run, and first-pass yield removes units that failed test. Gross capacity assumes the station runs every planned cycle and every unit passes.

Should rejects be reworked and retested?

Reworked units are not first-pass good, so they are excluded here. If rework is routine, model retest time separately and count only first-pass good units against the shift requirement.

How do I improve test throughput fastest?

Compare the two losses: downtime at the defaults costs 74.4 units and rejects cost 16.4, so raising uptime buys more capacity than chasing yield. Fix the larger loss first.

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End-Of-Line Test Throughput Calculator

Estimate good units from an end-of-line test station: units per cycle times planned cycles, derated by uptime and first-pass yield. The gap shows whether the station meets the shift requirement.

What this calculator does

Good tested units per shift from cycle rate, uptime and first-pass yield, measured against the units you require.

Formula used

Gross test capacity = units per test cycle × planned test cycles
Uptime capacity = gross test capacity × uptime ÷ 100
Good tested units = uptime capacity × first-pass yield ÷ 100
Units lost to downtime = gross − uptime capacity; units lost to rejects = uptime capacity − good
Test capacity gap = good tested units − required good units

Inputs explained

Units per Test Cycle: Finished units the station tests in one cycle.
Planned Test Cycles per Shift: Test cycles scheduled for the shift, from the line plan.
Test Station Uptime: Share of planned cycles the station is available to run.
End-Of-Line First-Pass Yield: Tested units that pass first pass, from recent shift counts.
Good Units Required per Shift: Good tested units the shift plan needs before pack-out.

How to use the result

Best suited to checking test capacity against shift demand, deciding between uptime and yield projects, sizing a second test station.
Excludes retest time, fixture calibration and queueing between test and pack-out. First-pass yield must come from recent counts, not a target.

Common questions

How do I calculate good tested units? Multiply units per test cycle by planned cycles, then multiply by uptime and by first-pass yield as fractions. At the defaults, 4 × 155 = 620 gross, 620 × 0.88 = 545.6 after uptime, and 545.6 × 0.97 = 529.232 good units.
Why is good tested units lower than gross capacity? Uptime removes the units the station could not run, and first-pass yield removes units that failed test. Gross capacity assumes the station runs every planned cycle and every unit passes.
Should rejects be reworked and retested? Reworked units are not first-pass good, so they are excluded here. If rework is routine, model retest time separately and count only first-pass good units against the shift requirement.
How do I improve test throughput fastest? Compare the two losses: downtime at the defaults costs 74.4 units and rejects cost 16.4, so raising uptime buys more capacity than chasing yield. Fix the larger loss first.

Last reviewed 2026-10-01.