Calculate sample size and acceptance limits based on the ANSI/ASQ Z1.4 AQL standard.

The AQL sampling tables show how the sample size and acceptance limits are determined based on the lot size, inspection level, and selected AQL values.

First, locate the lot size and inspection level to find the sample size code letter in Table A (-Left).
Then, use the code letter to find the required sample size in Table B (-Right).
Finally, check the selected AQL columns to find the acceptance number (Ac) and rejection number (Re).

If the number of defects is equal to or higher than the rejection number, the lot is usually considered not acceptable under the selected AQL sampling plan.

AQL, or Acceptable Quality Limit, is a sampling method used in product quality inspections to assess the overall quality level of a production lot against the agreed quality requirements.

Instead of checking every unit, inspectors use the lot size and inspection level to determine the sample size, then randomly select samples from the production lot. Any defects found are classified as critical, major, or minor and compared with the selected AQL limits.

This helps buyers make a practical decision on whether the shipment can be accepted, rejected, or needs further review or rework.