AQL Sampling Calculator
Calculate sample size and acceptance limits based on ANSI/ASQ Z1.4 AQL standard.
Sample Size: 0 units
Critical
Accept: 0
Reject: 0
Major
Accept: 0
Reject: 0
Minor
Accept: 0
Reject: 0
Understanding AQL Sampling in Quality Inspections
AQL (Acceptable Quality Limit) sampling is a widely used method for determining whether a production lot meets the required quality standards. Instead of inspecting every unit, inspectors examine a statistically determined sample based on the shipment quantity and inspection level. This approach allows buyers and importers to evaluate product quality efficiently while maintaining reliable inspection results.
Use the AQL Sampling Calculator above to simulate your inspection plan:
- Select the total shipment quantity (lot size)
- Select the inspection level (commonly General Level II)
- Select the AQL limits for critical, major, and minor defects (default values: Not Allowed, 2.5, and 4.0)
The calculator will automatically determine the required sample size and the acceptance or rejection criteria for the lot.
How to Read the AQL Sampling Tables
The tables below illustrate how sample sizes and acceptance limits are determined for normal inspections.
First, locate the shipment lot size and the corresponding inspection level to identify the sample size code letter (Table A - Left).
Next, refer to the sampling plan table (Table B - Right) to determine:
- The required sample size
- The maximum number of acceptable defects
- The rejection criteria if defects exceed the allowed limit
This standardized method ensures consistent inspection results and is widely used in pre-shipment inspections and other types of random quality inspections.
