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garment-smv-calculator

v1.0.2

Published

SMV (Standard Minute Value) calculator for garment industry sewing operations. Formula: SMV = Basic Time × (1 + Allowance%). Built and used in production by Scan ERP.

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Links

Git

Maintainers

drmcoder1drmcoder1

Keywords

garmentsmvsamstandard-minute-valuegarment-industrysewingapparelmanufacturingcmt-factorywestinghouse-ratingproduction-trackingstopwatch-methodtime-studyscan-erp

Readme

garment-smv-calculator

SMV (Standard Minute Value) calculator for the garment industry. Formula: SMV = Basic Time × (1 + Allowance%). Built and used in production by Scan ERP.

npm version License: MIT

Install

npm install garment-smv-calculator

Usage

const { calculateSMV } = require('garment-smv-calculator');

// Calculate SMV for a sewing operation
const smv = calculateSMV({
  observedTimeSeconds: 18,        // From stopwatch observation
  performanceRating: 1.05,        // Westinghouse rating (skilled at 105%)
  allowancePercent: 0.30,         // 30% (personal + fatigue + delay)
});

console.log(`SMV: ${smv.toFixed(2)} minutes per piece`);
// → SMV: 0.41 minutes per piece

API

calculateSMV({ observedTimeSeconds, performanceRating, allowancePercent })

Returns SMV in minutes per piece.

calculateHourlyCapacity({ smvMinutes, efficiencyPercent })

Returns expected hourly piece output based on SMV and operator efficiency.

calculateSMVFromTarget({ targetPiecesPerHour, efficiencyPercent })

Reverse calculation — given a target hourly output, what SMV is required?

performanceRatingFromWestinghouse({ skill, effort, conditions, consistency })

Calculate performance rating using the Westinghouse 4-factor system.

Background

SMV is the foundation metric for piece-rate wage calculation in CMT garment factories. Without accurate SMV, every downstream calculation (operator wages, line capacity, CMT pricing) produces wrong numbers.

Read the complete guide: SAM & SMV Formula in Garment Industry

Related Reading

Used By

License

MIT — Built by Santosh Rijal