Quality & Metrology worked example

AQL Sample Size at 9.2% acceptable quality level: a worked example

This scenario runs the aql sample size calculation on the strong side: 9.2% acceptable quality level, with every other input held at its documented default. Use it to plan AQL inspection workload before you look up the exact sample and acceptance number in ANSI/ASQ Z1.4.

The inputs for this scenario

  • Inspection lot size: 1,200 parts (unchanged)
  • Acceptable Quality Level (AQL): 9.2 % (raised for this scenario; the documented default is 8)
  • Minimum sample size: 80 parts (unchanged)

Working through the calculation

  • Applying the documented formula (Calculated sample = lot size × sampling rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 111 samples for required sample size, the number this scenario is built around.
  • At this operating point the engine returns 111 samples for calculated sample.
  • At this operating point the engine returns 80 samples for minimum sample size.

How this compares with the baseline

  • Against the tool's baseline example, where acceptable quality level sits at 8% and the headline result is 96 samples, this scenario comes in 15.63% above the baseline at 111 samples.
  • Use it when you receive or produce a discrete lot and need to set how many units to inspect before accepting or rejecting it. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Required sample size: 111 samples (headline result)
  • Calculated sample: 111 samples
  • Minimum sample size: 80 samples

Run it with your numbers

  • Every input above is editable in the live AQL Sample Size calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.