# SMV Calculation Software — GSD vs PMTS vs Free Tools > Compare GSD, SewEasy, PMTS, and free SMV calculation software for garment factories. Pricing, accuracy, fit by factory size. **Source:** [https://scanerp.pro/blog/smv-calculation-software-garment-industry.html](https://scanerp.pro/blog/smv-calculation-software-garment-industry.html) --- SMV Calculation Software — GSD vs PMTS vs Free Tools [Home](https://scanerp.pro/) / [Blog](https://scanerp.pro/blog/) / SMV Calculation Software # SMV Calculation Software for Garment Factories: GSD, PMTS, and What Small Factories Actually Use SR Santosh Rijal | April 20, 2026 | 10 min read INDUSTRIAL ENGINEERING Every garment factory eventually faces the same question: how do I calculate a reliable SMV for my operations without hiring a full-time industrial engineer? The answer depends on your factory size, how many new styles you quote per month, and how precise your costing needs to be. There are four approaches to SMV calculation in 2026 — from dedicated PMTS software used by major buyers to a stopwatch and a spreadsheet. This guide covers what each approach costs, who it's designed for, and which is right for your operation. ## What SMV Calculation Software Actually Does Key Numbers - The weakness of this method: it captures the SMV of the operator you timed, not an objective "standard." Rating — the judgement of whether an operator is at **80%**, 100%, or 120% — is subjective and requires experience to calibrate. - The investment is a good stopwatch, a trained person to conduct the study, and 30–**60 minutes** per operation. - A supervisor can see in real time that Line 3's overlock station is running at **58%** efficiency and investigate before the delay compounds. First, a clarification: **SMV (Standard Minute Value) and SAM (Standard Allowed Minutes) are the same thing**. South Asian garment industry uses SAM; Europe and UK use SMV. The formula is identical: `SMV = Observed Time × (Rating/100) × (1 + Allowance%)`. SMV calculation software exists at two levels: - **PMTS (Pre-Determined Motion Time Systems)** — calculate SMV from motion analysis, without a stopwatch. No sample needed. Examples: GSD, MTM, MOST, SewEasy. - **Time Study Tools** — structured spreadsheets or apps that help you record stopwatch observations and calculate SMV from actual timed data. The first category is used primarily by large buyers, brands, and their compliance/IE teams. The second category is what most CMT factories actually use. ## The Four Main SMV Calculation Approaches ### 1. GSDCost by Coats Digital **GSD (General Sewing Data)** is the most widely adopted PMTS system in the garment industry. GSDCost, the software implementation by Coats Digital, uses a Pre-Determined Time-Motion Database with **39 motion codes**, each with an associated International Standard Time. An industrial engineer breaks an operation into its component motions (reach, grasp, move, align, stitch, cut), assigns the correct motion code, and the system calculates SMV without needing a stopwatch or a physical sample. GSDCost is used extensively by large buyers for fair wage auditing and CMT benchmarking. Walmart and ASDA sourcing use SewEasy (a competing PMTS system) for SMV estimation in their lean sourcing programmes. **Who it's for:** Large factories, brands, compliance teams, industrial engineers who cost garments before samples exist. **Who it's not for:** Small CMT factories that receive finished tech packs and begin production immediately — the upfront investment and training required is disproportionate. ### 2. SewEasy GSD SewEasy is a competing PMTS platform that implements GSD methodology. It is used specifically for *quick* SMV estimation — faster than a full GSDCost analysis, at the cost of some precision. It has a specific market in sourcing teams that need rough SMV benchmarks across hundreds of styles per season. **Who it's for:** Sourcing offices, compliance auditors, brands benchmarking factory costing. **Who it's not for:** Factories optimising their own operations. ### 3. ETC (Engineered TruCost) and Similar PMTS Tools ETC is a PMTS designed specifically for the fashion and sewn products industry. Like GSD, it allows IE teams to calculate operation time and cost from motion analysis. The differentiator is speed — the vendor claims operations can be analysed in minutes rather than days compared to traditional time study. These tools occupy a similar space to GSDCost and SewEasy: useful for brands and large factories doing systematic IE work, less relevant for small factories. ### 4. Stopwatch Time Study + Spreadsheet This is the method used by the majority of small and mid-size garment factories globally — and for most operations, it is sufficient. The process: 1. Stand at the operation, stopwatch in hand 1. Time 10 consecutive cycles, recording each 1. Discard outliers (operator was interrupted, thread broke) 1. Calculate average Observed Time 1. Apply Rating Factor based on operator speed (80–120%) 1. Calculate Basic Time = Observed Time × (Rating / 100) 1. Add 15% allowance: SMV = Basic Time × 1.15 A properly constructed Google Sheet or Excel file handles this calculation automatically. The investment is a good stopwatch, a trained person to conduct the study, and 30–60 minutes per operation. The weakness of this method: it captures the SMV of the operator you timed, not an objective "standard." Rating — the judgement of whether an operator is at 80%, 100%, or 120% — is subjective and requires experience to calibrate. This is why large factories invest in PMTS: to remove the subjectivity from the rating step. ## Where SMV Data Goes After Calculation Calculating SMV is step one. Using it consistently is step two — and it requires integration with your production tracking system. SMV feeds into five downstream decisions in every garment factory: - **CMT costing**: Labour cost per piece = SMV × Cost Per Minute - **Daily capacity**: (Available minutes × Efficiency%) ÷ SMV = pieces per operator per day - **Line balancing**: Assign operators so each station's SMV matches the takt time - **[Operator efficiency](operator-efficiency-tracking-garment-factory.html)**: Efficiency% = (Total SMV produced ÷ Minutes worked) × 100 - **Piece-rate calculation**: Rate per piece derived from SMV and target daily earnings When SMV values are stored in your production system, the software can calculate operator efficiency automatically as bundles are scanned. A supervisor can see in real time that Line 3's overlock station is running at 58% efficiency and investigate before the delay compounds. This is the integration that moves SMV from an IE exercise into a live operational tool. For a complete guide to the SMV formula, rating, and allowances, see: [SAM & SMV calculation in the garment industry](sam-smv-calculation-garment-industry.html). ## Which Approach Is Right for Your Factory? Factory Profile Recommended Approach Small CMT, under 50 operators, receives tech packs Stopwatch + structured spreadsheet Mid-size, 50–200 operators, quotes own styles Stopwatch study + SMV library in garment ERP Large factory, 200+ operators, own IE team GSDCost or SewEasy for pre-production; time study for verification Brand or sourcing office auditing factory costs GSDCost, SewEasy, or ETC For most CMT factories in South Asia with fewer than 200 operators, the stopwatch method with a well-structured spreadsheet provides 80% of what dedicated SMV software delivers, at near-zero cost. The ROI of PMTS software only exceeds that threshold when you are regularly quoting many new styles per season and your inaccurate costing is costing you money on mispriced orders. For how SMV connects to [garment factory KPI tracking](garment-factory-kpi-metrics-production-manager.html) and real-time efficiency monitoring, see the full KPI guide. ### Free SMV/SAM Calculator Calculate SMV for any operation — single operation or full garment builder. No sign-up required. [Open Free SAM Calculator →](sam-smv-calculation-garment-industry.html#samCalculator) SR **Santosh Rijal** Garment factory owner and builder of Scan ERP. Tracks 1,400,000+ pieces across sewing lines in Nepal. Writes about factory operations, ERP systems, and the technology that actually works on the floor — not in PowerPoints. ## Related Articles [ ### SAM & SMV: Complete Calculation Guide + Free Calculator The formula, rating, allowances, and a free online calculator for any sewing operation. ](sam-smv-calculation-garment-industry.html) [ ### Sewing Line Efficiency: How to Calculate and Improve Efficiency formula, hourly targets, and what to do when a line falls below 65%. ](sewing-line-efficiency-calculation-garment-factory.html) [ ### Garment Factory KPI Metrics for Production Managers The 12 metrics that actually drive decisions — efficiency, DHU, WIP, and labour cost. ](garment-factory-kpi-metrics-production-manager.html) ### Related Articles & Guides [ SAM / SMV SAM & SMV Calculation Guide with Operation Breakdowns ](../blog/sam-smv-calculation-garment-industry.html) [ Payroll Piece-Rate Payment Calculation: Formula & Automation ](../blog/piece-rate-payment-calculation-garment-factory.html) [ Production WIP Tracking for Garment Factories — Real-Time Monitoring ](../blog/wip-tracking-garment-factory.html) [ Productivity Non-Productive Time: 90-Day Reduction Implementation Guide ](../blog/non-productive-time-garment-factory-complete-guide.html) [ QR Tracking How QR Code Production Tracking Works in Garment Factories ](../blog/qr-code-production-tracking-garment-factory.html) [ Dashboard Garment Factory ERP Dashboard: What It Shows & How to Read ](../blog/garment-factory-erp-dashboard-guide.html) OPEN SOURCE · MIT ### Or use our open-source SMV calculator Same logic as production-grade SMV software, but installable in seconds. Use it in your own dashboard or ERP integration. $ npm install garment-smv-calculator $ pip install garment-smv-calculator [Try it live →](/tools/) [See all 8 packages →](/blog/open-source-garment-toolkit.html) ## Related guides from the field More from a working CMT factory floor. [ ### How to Calculate SMV: Formula = Observed Time × Rating × (1 + Allowance%) SMV Formula: SMV = Observed Time × Performance Rating × (1 + Allowance%). Step-by-step stopwatch method with w… ](/blog/how-to-calculate-smv-stopwatch-method-garment-industry.html) [ ### SAM & SMV Formula in Garment Industry: SMV = Basic Time × 1.30 (Free Calculator) SMV Formula: SMV = Basic Time × (1 + Allowance%). Calculate SAM/SMV for sewing operators with stopwatch + West… ](/blog/sam-smv-calculation-garment-industry.html) [ ### SAM Values for Basic Garments: T-Shirt, Polo, Shirt, Trouser, Jeans Reference Ta Reference table of SAM (Standard Allowed Minute) values for common garments: basic T-shirt 8.5 min, polo shirt… ](/blog/sam-values-basic-garments-reference-table.html) [ ### SMV Costing: How to Use SMV to Price CMT Orders in a Garment Factory Complete SMV costing guide for garment factories. Formula: CMT Cost = SMV × Cost Per Minute. Calculate CPM… ](/blog/smv-costing-cmt-pricing-garment-factory.html) --- Built by [Scan ERP](https://scanerp.pro/) — QR-based ERP for CMT garment factories.