AQL calculator
Enter your lot size and AQL levels. Get the sample size and the accept and reject numbers from the ANSI/ASQ Z1.4 single sampling plan, normal inspection.
Inspect 125 pieces
Random sample from a lot of 3,000 · general level II · single sampling, normal
Critical defects
Accept 0 · Reject 1
Any critical defect fails the lot
Major defects
Accept 7 · Reject 8
AQL 2.5 · sample 125 · code K
Minor defects
Accept 10 · Reject 11
AQL 4 · sample 125 · code K
Single sampling plan, normal inspection, per ANSI/ASQ Z1.4 (ISO 2859-1 equivalent). When severities resolve to different sample sizes, inspect the largest sample and apply each accept and reject pair to its own defect class.
How the numbers are calculated
The calculator reads the same two tables printed on every pre-shipment inspection report.
Your lot size picks a code letter
The Z1.4 tables organize lot sizes into ranges, each mapped to a code letter specific to the inspection level. This letter determines your sample size, which can range from 2 to 2,000 pieces.
The AQL sets accept and reject numbers
For every defect class, an agreed AQL with your supplier results in a pair of numbers: you accept the lot if defects are at or below the first number, and reject it if they meet or exceed the second.
Arrows move you to a workable plan
In some cases, combinations lack a plan at their own sample size. The table directs you to the closest viable option, which is why a small lot with an AQL of 2.5 might still require 20 samples. The calculator resolves this for you.
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