Work out how many parts to inspect from a production lot and how many defects are acceptable, per ISO 2859-1 / ANSI-ASQ Z1.4. Enter lot size, AQL level and inspection level to get sample size, accept number and reject number.
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Request a Proposal →AQL (Acceptable Quality Level) sampling determines how many parts to inspect from a production lot and how many defects are acceptable. This calculator follows the ISO 2859-1 (ANSI/ASQ Z1.4) standard for attribute sampling inspection.
AQL 1.0-1.5 for critical dimensions (bearing fits, sealing surfaces). AQL 2.5 for general machining. AQL 4.0 for non-critical features (cosmetic, deburring). Aerospace often uses AQL 0.65 or tighter. Medical devices may require 100% inspection (c=0).
AQL is the quality level the producer aims for (acceptable quality). LTPD (Lot Tolerance Percent Defective) is the quality level the consumer is willing to accept. Sampling plans are designed to accept lots at AQL 95% of the time and reject lots at LTPD 90% of the time.
No. First-article inspection (FAI) requires 100% dimensional verification of one part per AS9102 or ISO 9001 requirements. AQL sampling is for ongoing production inspection (receiving inspection, in-process, final inspection), not for FAI or PPAP submissions.
Enter the lot size and desired AQL level. The calculator gives the required sample size and accept/reject criteria per ISO 2859-1. For critical safety features, use c=0 (zero defects accepted). For general machining, AQL 2.5 with normal inspection level II is standard.
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