garment-dhu-calculator

DHU (Defects Per Hundred Units) calculator for garment industry quality control.

The standard daily QC metric used across CMT factories worldwide. Built and used in production by Scan ERP.

Install

pip install garment-dhu-calculator

What is DHU?

DHU = (Total defects found / Total garments inspected) × 100

CRITICAL distinction: DHU counts defects, not defective pieces. One garment can have multiple defects — all are counted.

Example: A checker inspects 250 garments, finds 20 defective pieces with 35 total defects. DHU = (35 / 250) × 100 = 14

Usage

from garment_dhu_calculator import (
    calculate_dhu,
    calculate_dhu_by_type,
    aggregate_daily_dhu,
    classify_dhu,
)

# Basic DHU
calculate_dhu(defects_found=35, garments_inspected=250)
# → 14.0

# DHU broken down by defect type
calculate_dhu_by_type(
    defects_by_type={"broken-stitch": 12, "sizing": 8, "color-shade": 15},
    garments_inspected=250,
)
# → {"total": 14.0, "by_type": {"broken-stitch": 4.8, "sizing": 3.2, "color-shade": 6.0}, ...}

# Daily aggregate across multiple checkers
aggregate_daily_dhu([
    {"defects_found": 12, "garments_inspected": 80, "checker": "Sita"},
    {"defects_found": 18, "garments_inspected": 120, "checker": "Ram"},
    {"defects_found": 5, "garments_inspected": 50, "checker": "Gita"},
])
# → {"total_defects": 35, "total_garments": 250, "dhu": 14.0,
#    "by_checker": {"Sita": 15.0, "Ram": 15.0, "Gita": 10.0}}

# Industry benchmark classification
classify_dhu(14)  # → 'ACCEPTABLE'
classify_dhu(3)   # → 'EXCELLENT'
classify_dhu(30)  # → 'CRITICAL'

Industry benchmarks

Related

• garment-aql-calculator — ISO 2859-1 AQL sampling
• garment-smv-calculator — SMV / SAM calculation
• garment-piece-rate — piece-rate payment

License

MIT © Santosh Rijal / Scan ERP