Stop guessing.
Start inspecting smarter.
AQL is the international standard that tells you exactly how many units to inspect from any batch — and how many defects are acceptable before you reject the whole lot. It removes guesswork, protects your brand, and is trusted by every major retailer on earth.
AQL stands for Acceptable Quality Limit. A number — like 2.5 or 4.0 — that defines the maximum defective percentage acceptable in a shipment. AQL gives you a proven sample size and clear pass/fail rule, defined by ISO 2859-1.
Without AQL you over-inspect (wasting money) or under-inspect (letting defects reach customers). AQL creates a documented, defensible record — proof you followed international standards if a dispute arises with a supplier or buyer.
Instead of arguing about "how many to check," AQL gives a fixed answer based on lot size. Your QC team knows exactly what to inspect and how many defects trigger rejection. It removes subjectivity from quality decisions entirely.
Safety hazards or legal violations — sharp edges, missing warning labels, faulty wiring. Zero tolerance. One critical defect = entire lot rejected, no exceptions. AQL always set to 0.
Defects likely to cause a complaint or return — wrong colour, broken zipper, missing component. Industry standard AQL is 2.5. Required by most global retailers as their minimum.
Slight spec deviations that won't affect function or cause returns — cosmetic scratches, off-centre labels. AQL typically set to 4.0. Higher count tolerated before rejection.
AQL (Acceptable Quality Limit) is the maximum percentage of defective units acceptable during a random inspection of a production lot. Defined by ISO 2859-1 — used by every major retailer, importer, and manufacturer worldwide.
The AQL number (2.5, 4.0, etc.) does not mean "2.5% of products will be defective." It means the plan is designed to reject lots where the true defect rate exceeds that threshold with high statistical probability.
Controls the ratio of sample size to lot size. Higher level = larger sample = more confidence, but more cost and time.
| Level | Type | When to Use |
|---|---|---|
| S-1 to S-4 | Special | Destructive tests, expensive lab tests, very small samples needed |
| Level I | General | Trusted supplier, want smaller samples to save cost |
| Level II | General | Default for most industries — use this unless there's a reason not to |
| Level III | General | New suppliers, high-value goods, history of quality issues |
| Type | Definition | Example | Typical AQL |
|---|---|---|---|
| Critical | Safety risk or legal violation | Exposed wiring, toxic material, missing safety label | 0 — Zero Tolerance |
| Major | Likely complaint or return | Wrong colour, broken zipper, missing part | 2.5 |
| Minor | Slight deviation, won't affect function | Minor scratch, off-centre label | 4.0 |
Your lot size + inspection level maps to a code letter (A–R), which sets the exact sample size.
| Lot Size | Level I | Level II | Level III |
|---|---|---|---|
| 2 – 8 | A (n=2) | A (n=2) | B (n=3) |
| 9 – 15 | A (n=2) | B (n=3) | C (n=5) |
| 16 – 25 | B (n=3) | C (n=5) | D (n=8) |
| 26 – 50 | C (n=5) | D (n=8) | E (n=13) |
| 51 – 90 | C (n=5) | E (n=13) | F (n=20) |
| 91 – 150 | D (n=8) | F (n=20) | G (n=32) |
| 151 – 280 | E (n=13) | G (n=32) | H (n=50) |
| 281 – 500 | F (n=20) | H (n=50) | J (n=80) |
| 501 – 1200 | G (n=32) | J (n=80) | K (n=125) |
| 1201 – 3200 | H (n=50) | K (n=125) | L (n=200) |
| 3201 – 10000 | J (n=80) | L (n=200) | M (n=315) |
| 10001 – 35000 | K (n=125) | M (n=315) | N (n=500) |
| 35001 – 150000 | L (n=200) | N (n=500) | P (n=800) |
| 150001 – 500000 | M (n=315) | P (n=800) | Q (n=1250) |
| 500001+ | N (n=500) | Q (n=1250) | R (n=2000) |
ISO 2859-1 defines when to escalate or relax inspection based on supplier performance history.
| Switch | Condition | Meaning |
|---|---|---|
| Normal → Tightened | 2+ lots rejected out of 5 consecutive | Supplier struggling — increase scrutiny |
| Tightened → Normal | 5 consecutive lots accepted | Supplier recovered — resume standard |
| Normal → Reduced | 10 consecutive lots accepted + steady production | Trusted supplier — smaller samples OK |
| Reduced → Normal | Lot rejected or production irregular | Don't stay reduced if quality slips |
| Industry | Critical | Major | Minor |
|---|---|---|---|
| Electronics / Tech | 0 | 0.65 | 2.5 |
| Apparel / Textile | 0 | 2.5 | 4.0 |
| Toys / Consumer Goods | 0 | 1.5 | 2.5 |
| Automotive Parts | 0 | 0.65 | 1.5 |
| Food / Pharma | 0 | 0.4 | 1.0 |
| Furniture / Hardgoods | 0 | 2.5 | 4.0 |
Stop guessing.
Start inspecting smarter.
AQL is the international standard that tells you exactly how many units to inspect from any batch — and how many defects are acceptable before you reject the whole lot. It removes guesswork, protects your brand, and is trusted by every major retailer on earth.
AQL stands for Acceptable Quality Limit. A number — like 2.5 or 4.0 — that defines the maximum defective percentage acceptable in a shipment. AQL gives you a proven sample size and clear pass/fail rule, defined by ISO 2859-1.
Without AQL you over-inspect (wasting money) or under-inspect (letting defects reach customers). AQL creates a documented, defensible record — proof you followed international standards if a dispute arises with a supplier or buyer.
Instead of arguing about "how many to check," AQL gives a fixed answer based on lot size. Your QC team knows exactly what to inspect and how many defects trigger rejection. It removes subjectivity from quality decisions entirely.
Safety hazards or legal violations — sharp edges, missing warning labels, faulty wiring. Zero tolerance. One critical defect = entire lot rejected, no exceptions. AQL always set to 0.
Defects likely to cause a complaint or return — wrong colour, broken zipper, missing component. Industry standard AQL is 2.5. Required by most global retailers as their minimum.
Slight spec deviations that won't affect function or cause returns — cosmetic scratches, off-centre labels. AQL typically set to 4.0. Higher count tolerated before rejection.
AQL (Acceptable Quality Limit) is the maximum percentage of defective units acceptable during a random inspection of a production lot. Defined by ISO 2859-1 — used by every major retailer, importer, and manufacturer worldwide.
The AQL number (2.5, 4.0, etc.) does not mean "2.5% of products will be defective." It means the plan is designed to reject lots where the true defect rate exceeds that threshold with high statistical probability.
Controls the ratio of sample size to lot size. Higher level = larger sample = more confidence, but more cost and time.
| Level | Type | When to Use |
|---|---|---|
| S-1 to S-4 | Special | Destructive tests, expensive lab tests, very small samples needed |
| Level I | General | Trusted supplier, want smaller samples to save cost |
| Level II | General | Default for most industries — use this unless there's a reason not to |
| Level III | General | New suppliers, high-value goods, history of quality issues |
| Type | Definition | Example | Typical AQL |
|---|---|---|---|
| Critical | Safety risk or legal violation | Exposed wiring, toxic material, missing safety label | 0 — Zero Tolerance |
| Major | Likely complaint or return | Wrong colour, broken zipper, missing part | 2.5 |
| Minor | Slight deviation, won't affect function | Minor scratch, off-centre label | 4.0 |
Your lot size + inspection level maps to a code letter (A–R), which sets the exact sample size.
| Lot Size | Level I | Level II | Level III |
|---|---|---|---|
| 2 – 8 | A (n=2) | A (n=2) | B (n=3) |
| 9 – 15 | A (n=2) | B (n=3) | C (n=5) |
| 16 – 25 | B (n=3) | C (n=5) | D (n=8) |
| 26 – 50 | C (n=5) | D (n=8) | E (n=13) |
| 51 – 90 | C (n=5) | E (n=13) | F (n=20) |
| 91 – 150 | D (n=8) | F (n=20) | G (n=32) |
| 151 – 280 | E (n=13) | G (n=32) | H (n=50) |
| 281 – 500 | F (n=20) | H (n=50) | J (n=80) |
| 501 – 1200 | G (n=32) | J (n=80) | K (n=125) |
| 1201 – 3200 | H (n=50) | K (n=125) | L (n=200) |
| 3201 – 10000 | J (n=80) | L (n=200) | M (n=315) |
| 10001 – 35000 | K (n=125) | M (n=315) | N (n=500) |
| 35001 – 150000 | L (n=200) | N (n=500) | P (n=800) |
| 150001 – 500000 | M (n=315) | P (n=800) | Q (n=1250) |
| 500001+ | N (n=500) | Q (n=1250) | R (n=2000) |
ISO 2859-1 defines when to escalate or relax inspection based on supplier performance history.
| Switch | Condition | Meaning |
|---|---|---|
| Normal → Tightened | 2+ lots rejected out of 5 consecutive | Supplier struggling — increase scrutiny |
| Tightened → Normal | 5 consecutive lots accepted | Supplier recovered — resume standard |
| Normal → Reduced | 10 consecutive lots accepted + steady production | Trusted supplier — smaller samples OK |
| Reduced → Normal | Lot rejected or production irregular | Don't stay reduced if quality slips |
| Industry | Critical | Major | Minor |
|---|---|---|---|
| Electronics / Tech | 0 | 0.65 | 2.5 |
| Apparel / Textile | 0 | 2.5 | 4.0 |
| Toys / Consumer Goods | 0 | 1.5 | 2.5 |
| Automotive Parts | 0 | 0.65 | 1.5 |
| Food / Pharma | 0 | 0.4 | 1.0 |
| Furniture / Hardgoods | 0 | 2.5 | 4.0 |