When a garment quote looks too good, buyers usually start with the fabric. That is the wrong place to start. Fabric, trims, print and embroidery all follow fairly transparent pricing formulas, and buyers increasingly nominate the suppliers for them. The one element of an FOB price that is genuinely hard to read from the outside is labour cost — and it is also the element where a squeezed price most often shows up first.
This guide explains how garment labour cost is actually calculated, using the standard minute value (SMV), the standard minute rate (SMR) and the line efficiency that connects them. It then shows how a buyer can work backwards from a quote to test whether the CMT allowance in it is plausible — a check that costs little more than the time to ask for the numbers and regularly reveals more than haggling over the unit price.
Where labour sits in an FOB price
An FOB garment price is generally built from five elements — fabric, accessories and trims, print and embroidery, other costs such as development and transport, and labour — in the breakdown used by Online Clothing Study and many practitioners. The split is a convention, not a standard: manufacturers vary in what they fold into each element. Of these, labour is the contentious one: the same article calls labour costs “the contentious issue” of garment costing, because fabric follows consumption-based formulas buyers can check while labour depends on minutes and rates the buyer cannot see. The scale of the labour element is small in absolute terms. In open costings of adult men’s 5-pocket jeans for the spring/summer 2015 and 2016 seasons, the ILO found the cut-and-make (CM) cost — excluding profit and overhead — at USD 1.44 in China, USD 1.10 in Bangladesh and USD 1.19 in Cambodia per pair, and the paper notes that this labour cost “remains a constant irrespective of the retail market segment for the jeans whether value or luxury”. A few pennies shaved off the CMT allowance barely move the unit price, but across millions of pieces they translate into real money, and into real pressure on wages. The squeeze is documented: after Bangladesh raised its minimum wage by 80% in 2010 and 77% in 2013, FOB prices in some categories did not rise to match, meaning suppliers absorbed the increase — although the same paper’s polo-shirt illustration shows the direct-labour rise was almost covered (a shortfall of only 0.6 US cents per shirt), with the gap widening to 8.6 cents once overhead is included. What makes labour easy to understate is not its small share but the opacity around it — Fair Wear notes that without transparent labour costing, changes in labour costs were “relatively difficult for the supplier to argue and especially to quantify the impact on the product price”. The guidance is an archived PDF hosted on fairwear.org, uploaded in June 2020, with no publication date printed in the document, so it is used here for its method and definitions rather than as a dated benchmark.
The pressure has a structural cause. Price leadership — competing on the lowest retail price — is, in Michael Porter’s terms, the predominant strategy adopted by most apparel retailers, and as customers stay price-sensitive, buyers must hold margins while meeting predetermined retail prices. Suppliers, in turn, absorb the squeeze. Understanding how labour cost is calculated is therefore not an academic exercise. It is how a buyer forms an informed view of whether a price is fair, balanced and sustainable, rather than simply low.
What SMV actually measures
SMV, or standard minute value, is the standard time allocated to an operation — and, summed across operations, to a garment. It is the foundation of the whole calculation: if the time allowance is wrong, everything built on it is wrong too. One scope question matters before any number can be read: SAM is a time value — SMV plus allowances — for a specified set of operations, so the scope must be stated alongside the number. The scope of a SAM depends on the operations included in the costing: many factories count only sewing minutes, while others also include cutting and packing. A buyer should therefore always ask which operations the quoted figure covers — a sewing-only SMV and a full SAM are different numbers, and comparing them directly is meaningless.
Two methods are commonly used to establish SMV:
- Time study. An analyst measures the operation with a stopwatch, observing a trained operator working at a defined pace, rates the operator’s performance against a standard pace, then applies allowances for fatigue, personal needs and unavoidable delays. It is direct and factory-specific, but it depends heavily on the skill of the analyst, on the rating judgement, and on the conditions on the day.
- PMTS (predetermined motion time study). Instead of timing the whole operation, the analyst breaks it into basic motions — reach, grasp, position, sew — each with a pre-established time value set at a defined performance level, and adds them up. Because the motion times are already set at standard performance, no performance rating is needed; only allowances are added. Apparel Resources puts the contrast plainly: unlike time study, where a rating factor is added with the allowances, PMTS needs no rating — only allowances. It is more consistent across factories and less vulnerable to a single unusual observation, but it requires trained analysts and a maintained motion database.
Neither method produces a single “true” number. SMV is a standard, not a stopwatch reading: it represents the time a qualified operator should need at standard performance, before any allowances are added. Two factories can legitimately arrive at different SMVs for the same style if their machinery, layout, operator skill mix or allowance policies differ. That is why a buyer should treat any SMV a supplier quotes as a claim to be understood, not a fact to be accepted.
Two terms are easily confused, and the confusion is where most costing errors start. SMV is the standard time for the operation at standard performance, before allowances. SAM — standard allowed minutes — is SMV plus the allowances: bundle handling, machine delays and personal needs. Fair Wear’s guidance defines the split exactly this way: “SAM is adding in allowances like bundle allowance, machine allowance and personal allowance to the SMV”, i.e. SAM = SMV + allowance %. The costing formula below uses SAM, not bare SMV, because a line never sews at the bare standard minute. One caution: not every factory uses the two words this way. Coats Digital notes that SMV and SAM are often used interchangeably, and that American texts tend to say SAM where European ones say SMV — so when a factory quotes minutes, ask which allowances are already inside the number. Any quote that talks about “SMV” without saying whether allowances are included is leaving out a number the buyer needs.
What SMR adds: the cost of a minute
SMR, or standard minute rate, is the cost of one minute of factory time — but “one minute” can mean three different things, and the distinction is the decisive one in apparel labour costing. Fair Wear’s labour-minute guidance separates them:
- Labour minute value: the cost of one minute of direct labour, based on the average labour cost per worker per month divided by the worker’s available minutes.
- Factory labour minute value: the labour minute value divided by the direct-labour share — that is, direct labour plus the indirect labour that supports it.
- Working minute cost: the factory labour minute value plus overhead cost per minute (electricity, water, rent, depreciation and other overheads). This is the cost of one minute of sewing in the factory, and it is the figure the product-costing formula uses.
In this guide, “SMR” means the working minute cost unless stated otherwise. Where SMV answers “how long?”, SMR answers “how much does a minute of running this factory cost?”
The two figures combine in a single formula — with one condition the shorthand versions usually leave out:
Manufacturing (CM) cost before profit margin = SAM × working minute cost ÷ line efficiency
Note what this formula actually yields. Because the working minute cost already includes indirect labour and overhead, the result is the manufacturing (CM) cost before profit margin — the cost of making the garment, excluding the margin the factory adds when it quotes a CMT price. It is not the pure direct labour cost. The pure direct labour cost uses the labour minute value instead of the working minute cost: direct labour cost = SAM × labour minute value ÷ line efficiency. Coats Digital draws the same line: direct labour sits inside cost-to-make (CM or CMT), which also contains indirect labour, overhead and margin.
The efficiency term matters because a line never runs at 100%: Fair Wear’s own example is a polo shirt with a SAM of 18.0 minutes at 60% efficiency, needing 30.00 actual sewing minutes (18.0 ÷ 0.60). The shorthand “SMV × SMR = CMT” only holds at 100% efficiency, with allowances included and SMR read as the fully loaded working minute cost — and even then it gives the manufacturing cost before profit margin, not the quoted CMT price. Any of those three conditions left unstated makes the formula look simpler than it is.
A worked example makes the mechanics clear. Suppose a men’s polo shirt carries a SAM of 12 minutes and the factory’s working minute cost is $0.05 per minute. At 100% efficiency the manufacturing (CM) cost before profit margin is 12 × $0.05 = $0.60 per piece. At a realistic 60% line efficiency, the same garment’s manufacturing (CM) cost is 12 × $0.05 ÷ 0.60 = $1.00. The 12-minute polo shirt is the figure Online Clothing Study uses in its own SMR worked example, which also arrives at $0.60 — but note the rates are not interchangeable: that article’s $0.05 is an SMR whose denominator already contains 50% efficiency, while the $0.05 here is an illustrative working minute cost under the Fair Wear convention, where efficiency is a separate divisor. These numbers are illustrative arithmetic to show how the formula works, not industry benchmarks: real SAMs vary by style complexity, and real minute costs vary by country, factory scale and cost structure. The value of the example is that it shows exactly which inputs a buyer needs to interrogate — the minutes, the rate and the efficiency — rather than arguing about the final price in the abstract.
The buyer’s reverse check: working backwards from the quote
Here is the step the competing guides do not spell out as a workflow. A buyer who receives a quote can reverse the formula to test the CMT allowance inside it. The method takes four steps:
1. Isolate the CMT allowance. Ask the supplier to break out the CMT element of the quote, or estimate it from the cost breakdown the factory already provides. If the factory will not break out labour at all, that makes the check harder — but on its own it proves nothing about the factory. A factory that can show its work is a factory whose numbers can be checked; a factory that quotes a round number with no method behind it is asking to be trusted on faith.
2. Ask for the SAM and the basis behind it. Request the SAM for the style and the method used to derive it — time study or PMTS — plus the allowance percentage applied, whether cutting and packing minutes are included, and the line efficiency the quote assumes. Without the method, the allowance percentage and the efficiency, the SAM is a number without a basis — and a basis is what the check needs.
3. Sense-check the rate — but fix the efficiency first. The CMT allowance divided by the SAM gives an implied minute cost only if you also know the efficiency: paid minutes equal SAM divided by efficiency, so the same allowance can mean a low rate at high efficiency or a high rate at low efficiency. The reliable way to run the check is to work out the paid minutes another way: divide the CMT allowance by a working minute cost you can estimate independently — from local wages, social contributions, utilities and rent for a compliant factory in that location — and compare the result with SAM divided by efficiency. If the paid minutes implied by the quote are far below what the SAM and a realistic efficiency require, something is being absorbed elsewhere: unpaid overtime, piece-rate pressure, or corners cut on compliance. Coats Digital’s worked example shows why the efficiency matters: a factory quoting $1.20 for labour at $0.08 a minute is pricing 15 paid minutes, which could mean 40% efficiency on a 6.0-minute garment — or 9.0 minutes at 60% efficiency. The quote alone cannot tell you which; you need the efficiency to read it. You do not need the factory’s full accounts to spot an implausible rate; you need a rough sense of what a minute of legal factory time costs in that location, and the willingness to ask when the numbers do not add up.
4. Cross-check against a second signal. Compare the implied SAM with the factory’s demonstrated output — pieces per line per day at the quoted style — and with the lead time in the production plan. Output per line implies an efficiency, so state the efficiency you are assuming when you do this: if the SAM implies a line output the factory has never achieved at that efficiency, or a lead time far shorter than the production schedule allows, the CMT allowance is probably understated. This is where the costing check connects to the production plan: minutes, output and lead time must be consistent with each other.
None of this proves a wage violation. It identifies quotes that deserve a conversation before an order is placed, rather than a dispute after goods are shipped. As Online Clothing Study puts it, buyers would likely pay a few extra pennies if manufacturers were transparent about the costing process — and across multiple orders those pennies are what make the difference between a price that works and a price that only works by squeezing labour.
Common errors and misreadings
Treating SMV as a stopwatch reading. SMV is the standard time before allowances; SAM adds the allowances. A time-study figure with no allowances attached is not a SAM, and comparing it with a fully-loaded SAM from another factory is meaningless — and remember that some factories use the two terms interchangeably, so confirm which one a quoted figure is. Check, too, whether the figure covers sewing only or cutting to packing.
Comparing SMRs across countries. An SMR reflects local costs. A lower SMR in one country does not mean a more efficient factory; it usually means lower wages and lower overheads. Cross-country SMR comparisons tell you about cost structures, not about fairness.
Forgetting efficiency. A quote that multiplies SAM by the minute cost without dividing by efficiency understates the manufacturing cost by the efficiency gap — at 60% efficiency, the figure it gives is only 60% of the true cost, so it understates the manufacturing cost by 40%. Always ask what efficiency the quote assumes.
Assuming a low CMT means exploitation. It might mean efficient production, simpler construction, or genuine productivity advantages. The reverse check flags implausibility; it does not prove wrongdoing. The appropriate response to a flagged quote is a question, not an accusation.
Forgetting that SMV changes with the style. A new style, a fabric change, or a revised construction method changes the SMV. A quote that reuses last season’s SMV for a redesigned garment is using stale data, and the buyer should ask for a fresh estimate.
When this method does not apply
SMV-based costing fits sewn garments produced in lines, where operations can be timed and standardised. It is less useful for fully-fashioned knitwear, hand-finished products, or very small runs where setup time dominates and per-piece minutes are unstable. It also says nothing about whether the wage actually paid to the operator is the legal minimum or a living wage — that depends on how the minute cost is built and on the factory’s pay practices, both of which require separate verification through payroll review and worker interviews, not through costing arithmetic alone — see our supplier due diligence guide for what that verification looks like. Costing can flag an implausible quote; it cannot prove a wage violation. And any worker interviews used to verify pay should be conducted confidentially, so that workers are not exposed to retaliation for speaking.
Buyer checklist
- Ask for the CMT breakout, the SAM, the method behind it, the allowance percentage, which operations it covers, and the line efficiency assumed.
- Recover the paid minutes implied by the quote (CMT allowance ÷ working minute cost) and compare them with SAM ÷ efficiency.
- Cross-check SAM against line output and lead time for consistency, stating the efficiency assumed.
- Flag implausible quotes for discussion before ordering — and treat the costing check as a prompt for corroboration (payroll review, worker interviews), not as a compliance verdict.
- Record the SAM, minute cost and efficiency agreed for each style, so repeat orders can be compared like for like.
Frequently asked questions
What is the difference between SMV and SAM? SMV is the standard time for the operation at standard performance, before allowances; SAM is SMV plus allowances for bundle handling, machine delays and personal needs. The costing formula uses SAM. Note that some factories use the two terms interchangeably, so always confirm which one a quoted figure is.
What efficiency should I assume? Ask the factory — and test the quote at more than one efficiency. A quote that only works at 100% efficiency is not a realistic quote.
Can the reverse check prove a wage violation? No. It can only show that a CMT allowance is implausibly low. Wage compliance is established by payroll records and worker interviews.
Does a low CMT always mean exploitation? No. It can mean efficient production, simpler construction or genuine productivity advantages. The check flags implausibility; the response is a question, not an accusation.
Labour costing is not the most glamorous part of garment buying. But it is the part where a buyer’s commercial decision most directly touches the people who make the product. A buyer who can read a SAM and interrogate a minute cost is not just negotiating a better price — they are buying with their eyes open.
Sources
- Fair Wear, “Guidance for Use of the Fair Wear Labour and Minute and Product Costing Calculator” — three-level minute costs (labour minute value, factory labour minute value, working minute cost); product-costing formula: working minute cost × SAM ÷ efficiency; SMV and SAM definitions (SAM = SMV + allowance %); polo-shirt example (SAM 18.0, 60% efficiency, 30.00 actual sewing minutes). Hosted on fairwear.org, uploaded June 2020; no publication date is printed in the document. Read 9 November 2026. https://api.fairwear.org/wp-content/uploads/2020/06/Guidance-for-Use-of-the-Fair-Wear-Labour-and-Minute-and-Product-Costing-Calculator-Final.pdf
- ILO, Miller & Hohenegger (2016), “Redistributing value added towards labour in apparel supply chains”, Conditions of Work and Employment Series No. 83 — working minute price, SAM from cutting room to packing/dispatch, efficiency as a required factor; Figure 5 (p. 7): open costing of adult men’s 5-pocket jeans, spring/summer 2015 and 2016 seasons, China / Bangladesh / Cambodia, CM cost ex profit and overhead USD 1.44 / 1.10 / 1.19, SAMs 16 / 20 / 18 minutes; Bangladesh minimum-wage rises of 80% (2010) and 77% (2013) and the FOB response, including the polo-shirt illustration (direct-labour shortfall 0.6 cents; 8.6 cents including overhead). Read 9 November 2026. https://www.ilo.org/wcmsp5/groups/public/—ed_protect/—protrav/—travail/documents/publication/wcms_534536.pdf
- Online Clothing Study, “Sustainable Labour Costing in Fashion Manufacturing” — FOB five-element breakdown, price leadership as the predominant retail strategy, labour costs as “the contentious issue”, the SMV × SMR shorthand, and the “few extra pennies” passage; the “less than 25%” and “75%” statements (both are the author’s assertions without cited data; the figures are not repeated in this article). Published 1 December 2023, updated 10 September 2026. Read 5 November 2026. https://onlineclothingstudy.com/sustainable-labour-costing-in-fashion/
- Online Clothing Study, “How to Calculate Standard Minute Rate (SMR)?” — SMR with efficiency in the denominator; SMV must include cutting and packing, not sewing alone; 12-minute men’s polo shirt worked example (direct-only SMR $0.04 → CM $0.48; fully loaded SMR $0.05 at 50% efficiency → CM $0.60). Published 26 May 2023, updated 10 September 2026. Read 9 November 2026. https://onlineclothingstudy.com/how-to-calculate-standard-minute-rate/
- Coats Digital, “Garment Labour Cost: Bill of Labour vs Bill of Materials” — labour cost = (SMV ÷ line efficiency) × cost per minute; SMV and SAM often used interchangeably (American texts say SAM, European texts say SMV); the $1.20 / $0.08-a-minute reverse-check example (15 paid minutes: 40% efficiency on a 6.0-minute garment, or 9.0 minutes at 60%); “run the quote backwards” as check 6 of 7. Read 9 November 2026. https://www.coatsdigital.com/en/blog/bill-of-labour-vs-bill-of-materials/
- Apparel Resources, “Predetermined Motion Time System: Calculate Standard Time Using MTM, MODAPTS or MOST” — time study uses a stopwatch and a subjective performance rating; PMTS uses predetermined motion times and needs no rating, only allowances. Read 9 November 2026. https://apparelresources.com/business-news/manufacturing/predetermined-motion-time-system-calculate-standard-time-using-mtm-modapts/
Note: the worked example in this article uses illustrative figures to demonstrate the formula. It is not industry data. The 12-minute polo-shirt figure follows Online Clothing Study’s SMR article; the $0.05 rate here is an illustrative working minute cost under the Fair Wear convention (efficiency as a separate divisor), not Online Clothing Study’s $0.05 SMR, whose denominator already contains 50% efficiency. The 60% efficiency case is the author’s illustration of the Fair Wear formula, corroborated by Fair Wear’s own polo-shirt example (SAM 18.0 ÷ 60% = 30.00 actual sewing minutes).
