garment-piece-rate

Piece-rate wage calculator for CMT garment factories. Built and used in production by Scan ERP.

Install

pip install garment-piece-rate

Usage

from garment_piece_rate import calculate_piece_rate

result = calculate_piece_rate(
    pieces=250,
    rate_per_piece=2.50,
    skill_level="expert",
    quality_score=95,
    efficiency_percent=110,
    machine_type="OVERLOCK_5THREAD",
)
print(result)
# {
#   'gross': 906.95,
#   'breakdown': { 'base': 781.25, 'machine_bonus': 39.06, 'efficiency_bonus': 78.13, ... }
# }

Formula

adjusted_rate    = rate_per_piece × skill_multiplier
base             = pieces × adjusted_rate
machine_bonus    = base × machine_complexity_bonus[machine_type]
efficiency_bonus = base × 0.05 (if 100-109%) OR base × 0.10 (if 110%+)
quality_penalty  = base × (quality_threshold − quality_score) / 100  [if score below threshold]

gross = base + machine_bonus + efficiency_bonus − quality_penalty

Background

Piece-rate calculation is the core wage formula in CMT garment factories. Without automation, supervisor judgment causes 5-15% of wages to be disputed each month. This package implements the formula used by Scan ERP which has automated piece-rate for 115,370+ pieces in production.

Related Reading

• Piece Rate Calculation Software for Garment Factories
• Piece Rate Disputes in Garment Factory
• SAM & SMV Formula in Garment Industry

License

MIT — Built by Santosh Rijal of Scan ERP