AQL Calculator

Calculate Acceptance Quality Level (AQL) sampling plans for quality control inspections

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About This Tool

This AQL calculator helps quality control professionals determine sampling plans based on Acceptance Quality Level (AQL). Enter your sample size, acceptance number, lot size, and AQL percentage to calculate the probability of accepting or rejecting a lot. The tool uses binomial distribution calculations to provide accurate results for your quality inspection needs.

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How to Use

Enter the sample size (number of items to inspect)
Enter the acceptance number (maximum defective items allowed)
Enter the lot size (total items in the batch)
Enter the AQL percentage (acceptable quality level)
Click 'Calculate AQL' to see the acceptance probability, rejection probability, and detailed sampling plan

Frequently Asked Questions

Find Quick Answers

What is AQL (Acceptance Quality Level)?

AQL is the maximum percentage of defective items that is considered acceptable in a sampling inspection. It's a statistical measure used in quality control to determine whether to accept or reject a production lot.

How is the acceptance probability calculated?

The acceptance probability is calculated using the binomial distribution formula: P(accept) = Σ (from k=0 to c) [C(n,k) * p^k * (1-p)^(n-k)], where n=sample size, c=acceptance number, p=AQL percentage as decimal.

What sample size should I use?

Sample size depends on your lot size and desired confidence level. Common sampling plans use sample sizes between 20-200 items for lots of 100-10,000 units. The tool helps you evaluate different sample sizes.

Can I use this for any lot size?

Yes, the calculator works for any lot size. For very large lots (over 10,000), the binomial approximation becomes very accurate. For smaller lots, consider using hypergeometric distribution for exact calculations.

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