What is SMV (Standard Minute Value)?
SMV, or Standard Minute Value, is the standard time in minutes that a trained operator at normal pace takes to complete a sewing operation or a whole garment, with allowances added for real-world delays. It is the single number a factory builds its costing, capacity, and incentives on.
- It is a standard, not a stopwatch reading: SMV strips out how fast or slow one operator happens to be and expresses the time a qualified operator would take at standard performance. That makes it comparable across people, days, and factories.
- It is measured in minutes per piece: an operation might be 0.5 SMV; a basic T-shirt often totals around 8 to 10 SMV once every operation is added up. The garment SMV is the sum of its operation SMVs.
So SMV is not what one worker took this morning. It is the agreed standard time for the job, and because it is a standard, it can be turned into money and into capacity, which is what the rest of this guide covers.
The SMV formula, step by step
SMV is built in two moves: turn the stopwatch time into a basic time by adjusting for the operator's pace, then add allowances. The formula is SMV equals Basic Time times one plus the allowance percentage.
- Step 1, observed time: time the operation over several cycles with a stopwatch and take the average. Say the average observed time for a shoulder seam is 0.43 minutes.
- Step 2, basic time: multiply the observed time by the operator's performance rating, where 100 percent is standard pace. Basic Time equals Observed Time times the rating. At a 110 percent rating: 0.43 times 1.10 equals 0.473 minutes.
- Step 3, add allowances: add a percentage for unavoidable delays. SMV equals Basic Time times one plus the allowance. At a 20 percent allowance: 0.473 times 1.20 equals 0.57 minutes SMV for that operation.
The rating step is what makes SMV fair. A fast operator has a rating above 100 percent, a slower one below, and multiplying by the rating removes that speed so the standard reflects the operation, not the individual timed on the day.
What the allowances cover
Allowances exist because no operator sews without interruption. They convert the pure sewing time into a realistic standard, and they usually run between 10 and 30 percent of basic time, split into three buckets.
- Bundle allowance: picking up a bundle, untying it, orienting and positioning the pieces, and setting the finished work aside. Often around 10 percent.
- Machine allowance: threading, bobbin changes, needle changes, thread-break repairs, and routine oiling. Often around 10 percent.
- Personal and fatigue allowance: water and bathroom breaks, and the natural slowdown as the shift wears on. Often around 10 percent.
A commonly documented total is 30 percent, but the right figure depends on the operation and the factory, and it should be applied consistently. Change the allowance and every SMV, and therefore every cost and capacity number built on it, moves with it.
SMV vs SAM: are they the same?
In daily factory use, SMV and SAM are treated as the same number, and most people use the terms interchangeably. There is a fine conceptual distinction, but the definitions are applied inconsistently across the industry, so it pays to check what a given factory means.
- The common view: SMV, Standard Minute Value, and SAM, Standard Allowed Minutes, both mean the standard time to do the job with allowances included. Two words for one number.
- The fine distinction some draw: SMV as the base standard time and SAM as SMV plus allowances, so SAM is the allowed time. Others define SMV as already including allowances, which is why the two get muddled.
The practical rule is to agree the definition with whoever supplies the number. What matters is not the label but whether allowances are in it, because a time with allowances and one without can differ by a quarter or more, and that gap flows straight into cost.
How SMV is measured: time study vs GSD
There are two accepted ways to arrive at an SMV, and a factory may use either or both.
- Time study, the stopwatch method: observe a real operator over several cycles, rate the pace, and add allowances. It is the oldest method, quick for a new operation, but it depends on the analyst's rating judgement.
- Predetermined systems, GSD and PMTS: General Sewing Data and other predetermined motion-time systems build the basic time from a library of standard motions, before any operator is timed. GSD builds the time; SMV is that time with allowances added.
Predetermined systems give a consistent, defensible number that does not depend on who held the stopwatch, which is why larger factories and buyers lean on them for costing. Time study stays useful on the floor for quick checks and new operations.
How SMV drives the CMT price
This is where SMV turns into money. The make cost of a garment, the CMT or cut-make-trim charge for the sewing, is the SMV multiplied by the factory's cost per minute.
- The formula: CMT cost per garment equals SMV times cost per minute, or CPM. If a garment is 8.5 SMV and the factory's CPM is 3.5 of its currency, the make cost is about 29.75 per piece before margin.
- Where CPM comes from: the factory divides its total running cost by its productive minutes: total cost over operators times shift minutes times efficiency. Efficiency matters because a line rarely runs at 100 percent, so the real cost per good minute is higher than the raw one.
The CMT figure is only the sewing cost. It sits inside the wider landed cost alongside fabric, trims, freight and duty, so a low SMV helps the price but does not decide it on its own. The garment still has to be manufactured to the right quality at that time.
For a buyer, this is why the SMV matters commercially. If a factory quotes a make cost that implies a much higher SMV than the garment should need, either the operation breakdown is inefficient or the number is padded, and both are worth questioning.
It also explains why the same garment can cost different amounts at two factories with similar wages. A factory with a lower SMV for the same style, through a better line layout or method, or a lower cost per minute, through higher efficiency, can quote a keener make cost without cutting corners. Comparing SMVs, not just prices, shows which factory is genuinely more productive rather than simply cheaper on the day.
How SMV drives line capacity and delivery
The same number that prices the garment also tells you how many you can make and how long it will take. Capacity planning runs entirely on SMV.
- Daily capacity in standard minutes: operators times working minutes times efficiency. A line of 25 operators working 480 minutes at 55 percent efficiency yields 25 times 480 times 0.55, which is 6,600 standard minutes a day.
- Pieces per day: divide the daily standard minutes by the garment SMV. At 8.5 SMV, 6,600 divided by 8.5 is about 776 pieces a day.
- Delivery time: divide the order by the daily output. A 10,000-piece order at 776 a day needs about 13 working days on that line, before any buffer.
Efficiency is the variable that trips up newcomers. A well-run line typically runs around 55 to 75 percent; the average factory in South Asia sits lower, near 40 to 55 percent, and only world-class operations sustain 85 percent or more. A new style or a new line also starts far below its steady state and climbs as operators learn it, so planning at a factory's steady-state efficiency, not a best-case number, is what keeps a delivery date honest.
Get the SMV wrong and both numbers are wrong together. An SMV set too low promises a capacity and a delivery date the line cannot hit; set too high, it prices the order out and idles the line. It is the hinge the whole plan turns on, which is why a buyer benefits from understanding it even without measuring it.
How to use SMV in sourcing
A buyer does not need to run a time study, but should read an SMV the way a factory does, because it underpins both the price and the promise.
- Ask for the operation breakdown: a credible SMV comes with a list of operations and their times that sum to the total, not a single round figure. The breakdown is where padding or an inefficient method shows up.
- Sanity-check the make cost: SMV times a reasonable cost per minute should land near the quoted CMT. If it is far off, ask why, and remember the sewing cost is one line in the full landed cost, not the whole price.
- Use it to test capacity claims: run the capacity maths before you trust a delivery date, and factor the SMV into how you choose and brief a manufacturer.
Knowing the SMV, cost-per-minute and capacity a given garment and factory imply is the fashion-native detail Apshan's Nari knowledge graph answers, cited to source, inside the AI assistant your team already uses. Request access.