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.

Two languages, same logic

Language	Install	Source
Node.js / TypeScript	npm install garment-fabric-consumption	npm/
Python 3.7+	pip install garment-fabric-consumption	python/

Methods

Knit (weight method)

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

Woven (length method)

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

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

API

• calculateKnitConsumption / calculate_knit_consumption
• calculateWovenConsumption / calculate_woven_consumption
• gsmToOzPerYd2 / gsm_to_oz_per_yd2
• ozPerYd2ToGsm / oz_per_yd2_to_gsm
• addWastageAllowance / add_wastage_allowance

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%

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

Related

• garment-cmt-cost — CMT cost calculation
• garment-line-efficiency
• garment-smv-calculator

Related Packages — Scan ERP Garment Toolkit

Part of the Scan ERP open-source garment toolkit — production-tested utilities for CMT factory operations, all MIT licensed:

• aql-sample-size — ISO 2859-1 sample-size lookup (zero-dependency data library)
• garment-aql-calculator — Full AQL inspection decision engine with pass/fail logic
• garment-bundle-id — Bundle QR code generator + parser (STYLE-LOT-COLOR-SIZE-BUNDLE# format)
• garment-cmt-cost — CMT cost calculator with 13-country CPM comparison
• garment-dhu-calculator — Defects Per Hundred Units with defect-type breakdown + multi-checker aggregation
• garment-fabric-consumption — Fabric consumption (knit GSM × area, woven marker length)
• garment-line-efficiency — Line efficiency, target output, line balance / bottleneck detection
• garment-piece-rate — Piece-rate earnings calculator with bonuses and overtime
• garment-smv-calculator — Stopwatch SMV/SAM with Westinghouse performance rating

See the curated awesome-garment-erp list for the full Scan ERP ecosystem, or visit scanerp.pro for the production garment manufacturing ERP this toolkit powers.