AQL Calculator
Calculate sample sizes and acceptance numbers based on ANSI/ASQ Z1.4 and ISO 2859-1 sampling standards.
AQL Calculator
Determine sample size and acceptance criteria based on ANSI/ASQ Z1.4 (Normal Inspection).
Free AQL Calculator Online
An AQL (Acceptable Quality Limit) calculator is a tool that automatically determines the required sample size and acceptance criteria for product inspections. By entering the lot size, inspection level, and AQL value, the calculator provides the sample size code letter, sample size, acceptance number, and rejection number.
How to Use the AQL Calculator
- Lot Size: Enter the total production quantity. This value determines the sample size code letter based on ISO 2859-1.
- Inspection Level: Select the inspection level. General Level II is the default for most consumer goods. Level I uses a smaller sample, Level III a larger sample. Special levels (S-1 to S-4) are used for limited, functional, or destructive inspections.
- AQL Value: Choose the Acceptable Quality Limit. Common examples: critical defects AQL 0, major defects 1.0–2.5, minor defects 4.0–6.5.
After entering the inputs, the calculator displays the required sample size and the acceptance and rejection numbers for the inspection.
Example AQL Calculation
A shipment of 2,000 T-shirts is ready for inspection. Enter Lot Size 2,000, Inspection Level General II, and AQL 2.5. The calculator shows the sample size and acceptance/rejection numbers needed.
When Should You Use an AQL Calculator?
This calculator is useful for pre-shipment inspections, during production inspections, incoming quality control, supplier quality management, factory audits, and production quality checks.
Why Use an AQL Calculator?
- Save Time: Eliminates manual lookups in AQL sampling tables.
- Reduce Errors: Automatic calculations reduce the risk of incorrect sample sizes or acceptance numbers.
- Improve Consistency: Ensures inspections follow standardized sampling procedures.
Frequently Asked Questions
What is an AQL calculator?
An AQL calculator determines the sample size and acceptance criteria required for product inspections based on ISO 2859-1 and ANSI/ASQ Z1.4 standards.
Is this calculator based on ANSI/ASQ Z1.4?
Yes. This calculator follows ANSI/ASQ Z1.4 and ISO 2859-1 sampling standards for normal inspection.
What is the most commonly used inspection level?
General Inspection Level II is the most commonly used inspection level for product inspections.
Does the calculator determine pass or fail?
No. The calculator provides the acceptance and rejection numbers that inspectors use to determine whether a shipment passes or fails.
Does AQL guarantee zero defects?
No. AQL is a statistical sampling method and does not guarantee that every unit in a production lot is defect-free.