garment-aql-calculator 1.0.0

AQL (Acceptable Quality Limit) sampling calculator for garment industry QC. Implements ISO 2859-1 sample size code letters and accept/reject tables. Built and used in production by Scan ERP.

garment-aql-calculator

AQL (Acceptable Quality Limit) sampling calculator for garment industry quality control. Implements ISO 2859-1 — the universal standard for inspection by attributes used by every garment QC team globally.

Built and used in production by Scan ERP — a garment manufacturing ERP running on a 100+ machine CMT factory in Nepal.

Install

npm install garment-aql-calculator

Why this exists

Every garment factory QC team runs AQL sampling on every shipment. Existing tools (QIMA, HQTS, Tetra Inspection) are web-only — no programmatic library. This package fills that gap so ERP systems, QC apps, and custom dashboards can run AQL calculations natively.

Quick start

const { calculateAQL } = require('garment-aql-calculator');

const result = calculateAQL({
  lotSize: 2400,
  inspectionLevel: 'GII',
  aql: 2.5,
});

console.log(result);
// {
//   lotSize: 2400,
//   inspectionLevel: 'GII',
//   aql: 2.5,
//   codeLetter: 'K',
//   sampleSize: 125,
//   acceptNumber: 7,
//   rejectNumber: 8,
//   decision: [Function]
// }

// Use the decision function with actual defects found
console.log(result.decision(5));   // 'ACCEPT' (5 ≤ 7)
console.log(result.decision(8));   // 'REJECT' (8 ≥ 8)

Full garment inspection (critical + major + minor)

Standard garment QC runs three AQL sampling plans simultaneously. Use the convenience function:

const { calculateGarmentInspection } = require('garment-aql-calculator');

const inspection = calculateGarmentInspection({
  lotSize: 2400,
  inspectionLevel: 'GII',
  // Defaults — standard garment industry values
  criticalAQL: 0.65,
  majorAQL: 2.5,
  minorAQL: 4.0,
});

console.log('Critical:', inspection.critical.sampleSize, 'accept', inspection.critical.acceptNumber);
console.log('Major:',    inspection.major.sampleSize,    'accept', inspection.major.acceptNumber);
console.log('Minor:',    inspection.minor.sampleSize,    'accept', inspection.minor.acceptNumber);

API

calculateAQL({ lotSize, inspectionLevel, aql })

Param	Type	Default	Notes
lotSize	number	required	Total units in the production lot (≥ 2)
inspectionLevel	string	'GII'	One of S1, S2, S3, S4, GI, GII, GIII
aql	number	2.5	One of 0.65, 1.0, 1.5, 2.5, 4.0, 6.5

Returns { codeLetter, sampleSize, acceptNumber, rejectNumber, decision }.

calculateGarmentInspection({ lotSize, inspectionLevel, criticalAQL, majorAQL, minorAQL })

Returns three AQL results — one for each defect tier.

getCodeLetter(lotSize, inspectionLevel)

Lower-level utility: returns just the ISO 2859 code letter.

ISO 2859 reference

Inspection level	Use case
GI	Lower-risk products, smaller sample
GII	Default — most garment inspections
GIII	Higher-risk products, larger sample
S1, S2, S3, S4	Special inspection levels for destructive or expensive testing

Garment defect tier	Standard AQL
Critical (safety, regulatory)	0.65
Major (workmanship affecting function)	2.5
Minor (cosmetic only)	4.0

License

MIT — © 2026 Santosh Rijal / Scan ERP — https://scanerp.pro

Related packages

• garment-smv-calculator — SMV/SAM time-study
• garment-piece-rate — Piece-rate payment calculation
• garment-bundle-id — Bundle ID generation
• garment-dhu-calculator — Defects Per Hundred Units
• garment-line-efficiency — Sewing line efficiency
• garment-fabric-consumption — Fabric consumption
• garment-cmt-cost — CMT cost calculation