QUALITY CONTROL TOOLS
AQL Sampling Plan Calculator
Based on ISO 2859-1 (ANSI/ASQ Z1.4) international standard, providing precise pre-shipment inspection (FRI) determination plans。
Parameter Settings
PCS
Enter a value between 2 and 900,000,000
AQL 0
AQL 2.5
AQL 4
Pro Tip
Inspection LevelLevel II is the most common standard in international consumer goods trade. If your product involves high-density precision electronics or medical equipment, it is recommended to upgrade to Level III。
CriticalAQL 0
Sample Size
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Accept (Ac)
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Reject (Re)
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MajorAQL 2.5
Sample Size
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Accept (Ac)
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Reject (Re)
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MinorAQL 4
Sample Size
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Accept (Ac)
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Reject (Re)
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Judgment Summary Table
| Defect Type | AQL Standards | Sample Size | Accept (Ac) | Reject (Re) |
|---|---|---|---|---|
| Critical | 0 | -- | -- | -- |
| Major | 2.5 | -- | -- | -- |
| Minor | 4 | -- | -- | -- |
Based on ISO 2859-1 (Normal Inspection - Single Sampling)
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Frequently Asked Questions About AQL Sampling
Understanding AQL
What is AQL (Acceptable Quality Limit)?▼
AQL (Acceptable Quality Limit) is a statistical measurement defined in ISO 2859-1 (ANSI/ASQ Z1.4). It represents the maximum percentage of defective units that can be considered acceptable during random sampling inspection. The lower the AQL value, the stricter the quality requirement. For example, AQL 1.0 means no more than 1% of the sampled units should be defective.
Which inspection level should I choose?▼
General Inspection Level II is the most commonly used and is the default for most consumer goods. Level I (Reduced) is suitable when quality history is excellent or inspection costs need to be minimized. Level III (Tightened) is recommended for high-value, safety-critical, or precision products such as medical devices and automotive components. Special levels (S-1 to S-4) are for destructive tests or very small sample sizes.
What is the difference between Critical, Major, and Minor defects?▼
Critical defects render the product unsafe or non-compliant with mandatory regulations — these have zero tolerance (AQL 0). Major defects significantly affect product function, appearance, or marketability — typical AQL is 2.5. Minor defects are slight deviations from specifications that do not substantially affect usability — typical AQL is 4.0.
How do I interpret the Ac and Re values?▼
Ac (Accept) is the maximum number of defective units allowed in the sample for the lot to pass inspection. Re (Reject) is the threshold at which the lot fails inspection. If the number of defects found is between Ac and Re, the lot is in a gray zone — in most cases, inspection proceeds to the Re value as the decision point.
Does QTC provide professional AQL inspection services?▼
Yes, QTC provides professional third-party AQL inspection services including Pre-Shipment Inspection (FRI), During Production Inspection (DUPRO), and more. Our inspectors are trained in ISO 2859-1 standards and use the IntegrityView™ platform for transparent reporting. Contact us to book an inspection.