garment-fabric-consumption

Fabric consumption calculator for garment manufacturing.

Supports both knit (GSM-based weight method) and woven (marker-length method) garments. Includes wastage allowance and GSM ↔ oz/yd² conversion. Built and used in production by Scan ERP — the garment manufacturing ERP that tracks fabric consumption from cutting batch to dispatch.

Install

npm install garment-fabric-consumption

Methods

1. Knit (weight method)

Total area (m²) = (body L × W × 2) + (sleeve L × W × 2 × 2)   ← in cm²/10000
Weight (g)      = Area × GSM

2. Woven (length method)

Per garment (m) = Marker length / Pieces per marker

Both methods accept an optional wastagePercent (5–10% is typical).

Usage

const {
  calculateKnitConsumption,
  calculateWovenConsumption,
  gsmToOzPerYd2,
  ozPerYd2ToGsm,
  addWastageAllowance,
} = require('garment-fabric-consumption');

// Knit T-shirt: body 70 × 56 cm, sleeves 22 × 22 cm, 180 GSM, 8% wastage
calculateKnitConsumption({
  bodyLength: 70, chest: 56, sleeveLength: 22, sleeveWidth: 22,
  gsm: 180, wastagePercent: 8,
});
// → { perGarmentG: 190.045, perGarmentKg: 0.190,
//     perDozenKg: 2.28, perHundredKg: 19.00,
//     baseWeightG: 175.968, wastageG: 14.077,
//     area_m2: 0.9776, area_cm2: 9776 }

// Woven shirt: 3.5m marker yields 6 pieces, 5% wastage
calculateWovenConsumption({ markerLength: 3.5, piecesPerMarker: 6, wastagePercent: 5 });
// → { perGarmentM: 0.6125, perGarmentYd: 0.6699,
//     perDozenM: 7.35, baseLengthM: 0.5833, wastageM: 0.029 }

// GSM ↔ oz/yd² conversion (1 oz/yd² ≈ 33.906 g/m²)
gsmToOzPerYd2(180);   // → 5.308 oz/yd²
ozPerYd2ToGsm(5);     // → 169.53 GSM

// Generic wastage allowance
addWastageAllowance(1.0, 8); // → 1.08

Typical wastage allowances

| Garment type | Wastage % | |-----------------|-----------| | Basic T-shirt | 5–8% | | Polo / fashion knit | 8–10% | | Shirt (woven) | 5–7% | | Trouser | 5–8% | | Heavy outerwear | 8–12% |

Related

• garment-cmt-cost — CMT cost calculation
• garment-smv-calculator — SMV / SAM
• garment-piece-rate — piece-rate payment

Try Scan ERP

This calculator is free. The full ERP that uses it every cutting batch — with size-aware consumption from Optitex marker data and GSM analysis — is at scanerp.pro.

• Live demo · 1.4M+ pieces tracked
• Cutting room waste reduction guide
• Fabric inspection 4-point system
• Free 30-day trial

License

MIT © Santosh Rijal / Scan ERP