Average Sample Number (ASN) Calculator
Determine the expected sample size for your acceptance sampling plan with our statistical calculator
Sampling Plan Parameters
Quality Levels
ASN Calculation Results
Enter your parameters to evaluate the efficiency of your sampling plan.
Detailed Analysis
Your detailed ASN analysis will appear here.
📊 Common Sampling Plans
| Plan Type | Lot Size | Sample Size | Acceptance # | Rejection # | Typical ASN |
|---|---|---|---|---|---|
| Single | 1,000-5,000 | 80 | 2 | 3 | 80 |
| Double | 5,001-10,000 | 50 + 50 | 1 + 4 | 4 + 5 | ~75 |
| Multiple | 10,001-50,000 | 20 × 5 | 0-1-2-3-4 | 3-4-5-6-7 | ~60 |
| Sequential | 50,001+ | Variable | Acceptance Line | Rejection Line | ~40% of N |
Note: These are example plans. Actual parameters should be determined based on AQL, LTPD, and risk levels.
📚 Quality Control Best Practices
Plan Selection
Choose sampling plans based on your Acceptable Quality Level (AQL) and Lot Tolerance Percent Defective (LTPD).
Risk Management
Balance producer's risk (α) and consumer's risk (β) when designing your sampling plan.
OC Curves
Always review the Operating Characteristic (OC) curve to understand your plan's discrimination power.
Inspection Level
Use tightened inspection when quality deteriorates and reduced inspection when quality improves.
Documentation
Maintain detailed records of sampling results to track quality trends over time.
Continuous Review
Regularly review and adjust your sampling plans based on actual quality performance.
Note: This calculator provides estimates based on statistical formulas. Actual sampling results may vary. For critical applications, consult with a quality control specialist or statistician.