This page teaches a merchandiser, planner or factory owner how to calculate the total fabric an order needs, starting from one garment's own fabric consumption and the order quantity. It is for anyone who releases a fabric purchase order or checks one before signing it, and no previous lesson is needed. This mainly teaches the money flow: getting a fabric quantity right decides how much fabric a mill invoices and how much cash a factory ties up in stock.
At work, a planner cannot ask a mill to "send some fabric" and check the invoice afterwards. A purchase order needs an exact quantity, in the right unit, before the mill starts weaving or dyeing. Without this skill, a planner either orders too little fabric, and a production run stops midway, or orders too much, and the factory pays for and stores fabric it never needed.
The two figures this lesson uses are already fixed and familiar: Order A's fabric weight, already used once for its yarn requirement, and Order B's denim length, both stated per piece. The new skill here is turning either per-piece figure into a whole order's total, and knowing why the two figures use different units in the first place.
You need: No previous lesson. It helps to know Order A and Order B's basic facts (a T-shirt and a pair of jeans), covered informally in earlier tracks.
By the end of this lesson you can:
Not covered here: how a marker itself is laid out on fabric (a later fabric-calculations lesson), converting a fabric's weight between GSM and oz/yd2 (Lesson 3.2), the cost of the fabric once the total quantity is known (Lesson 3.3).
| Term | Meaning |
|---|---|
| Fabric consumption | The amount of fabric, by weight or length, one garment piece uses; the basis for calculating an order's total fabric requirement. |
| Marker wastage | Fabric lost during cutting because pattern pieces never fill a cutting layout perfectly; a separate allowance from combing waste. |
| Knit fabric | Fabric made by looping yarn, usually sold and cut by weight because roll widths can vary. |
| Woven fabric | Fabric made by crossing threads on a loom, usually sold and cut by length at a fixed, known width. Used for shirts and jeans. |
| GSM | Grams per square metre: the standard way fabric weight is stated. |
| Total fabric requirement | The whole order's fabric quantity, found by multiplying the per-piece consumption figure by the order quantity. |
Knit fabric is bought and cut by weight, in kilograms, because a knitting mill's rolls can vary in width even at the same fabric quality, so weight is the more consistent unit to buy and cut against. Order A's own fabric, a single jersey T-shirt fabric, is fixed at 0.205 kg per piece, already including a 7% marker-wastage allowance. Woven fabric is bought and cut by length, in metres, off a roll of a known, fixed width, so length is the more consistent unit for a woven fabric. Order B's own denim is fixed at 1.45 m per piece. In both cases, multiplying the per-piece figure by the order's total pieces gives the whole order's total fabric requirement, a live formula on this course's calculator, never a typed number.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Knit consumption (by weight) | Order A's own 0.205 kg per piece, already including a 7% marker-wastage allowance | Multiplying by the order quantity gives the whole order's fabric requirement in kilograms, already established once for yarn and reused here for fabric. |
| Woven consumption (by length) | Order B's own denim, 1.45 m per piece | Multiplying by the order quantity gives the whole order's fabric requirement in metres, using a length-based unit instead of weight. |
| Marker wastage already included | A per-piece figure such as Order A's 0.205 kg | Adding marker wastage a second time on top of a figure that already includes it overstates the fabric requirement. |
| Why the units differ | Knit rolls vary in width; woven rolls hold a fixed width | Weight is the more consistent unit for a knit; length is the more consistent unit for a woven fabric cut at a known width. |
| Related product families | Socks and hosiery (usually weight-based, like a knit), terry towels and home-textile bedding (often length-based, like a woven) | The same weight-versus-length choice reappears outside apparel, following the same knit-or-woven logic. |
Delta Garments produces Order A, Northline Apparel's basic cotton T-shirt, and separately produces Order B, the five-pocket jeans. Before its planner can release a fabric purchase order, Delta Garments must confirm each order's total fabric requirement: Order A's knit fabric from Rowad Knits, the knitting mill, and Order B's woven denim from Suez Denim, the denim mill. Both totals must be right before either mill is asked to start, because a mill plans its own dyeing, weaving or knitting capacity around the exact quantity it is asked to deliver, not around a rough estimate.
Delta Garments cannot simply ask each mill to supply "enough" fabric. Rowad Knits needs a firm kilogram figure to plan its knitting and, where relevant, hand off to Colorline Dyeing for finishing; Suez Denim needs a firm metre figure to plan its weaving run and any washing that follows. Getting either figure wrong before the purchase order goes out is far cheaper to correct than discovering the shortfall or the excess once fabric has already arrived at the factory gate.
The worked numberOrder A's own fixed figures: 0.205 kg of fabric per piece, already including its 7% marker wastage, multiplied by 15,000 pieces.
Order B's own fixed figures: 1.45 m of denim per piece, multiplied by 3,000 pieces.
Order A's total is 3,075 kg of knit fabric; Order B's total is 4,350 m of woven denim. Both totals are already-fixed figures reused here, worked out live on this course's fabric calculator rather than typed in by hand.
A common mistake is applying an extra wastage percentage to Order A's 0.205 kg per piece, on the assumption that marker wastage still needs to be added. Order A's figure already accounts for its own 7% marker wastage, so adding it again double-counts the allowance and overstates the fabric requirement. A planner who does this releases a purchase order for more fabric than the order actually needs, and the factory pays for and stores the excess.
This mistake is easy to make because marker wastage sounds like something that should always be added by the person doing the calculation, rather than something that can already be built into a figure someone else has already prepared. The safeguard is simple: before multiplying a per-piece figure by an order quantity, check whether the specification line already states that wastage is included, exactly as Order A's own spec line does, and treat that figure as final rather than as a starting point for a further addition.
This lesson shows how to work out how much fabric a whole order needs. One garment made from knitted fabric is usually measured by weight, because rolls of knitted fabric can come in different widths. One garment made from woven fabric is usually measured by length, because woven fabric comes off a roll of a fixed width. Either way, taking the amount one garment uses and multiplying it by how many garments are being made gives the total fabric the whole order needs. If that one-garment figure already includes some extra for cutting waste, it should not be added again.
Delta Garments' planner must release a fabric purchase order to Rowad Knits for Order A and a separate purchase order to Suez Denim for Order B. Before either purchase order goes out, the planner checks both orders' total fabric requirements against the specification lines already on file.
What is each order's total fabric requirement, and should any further wastage be added?
Order A needs 3,075 kg of fabric, from 0.205 kg per piece multiplied by 15,000 pieces. This figure already includes its own 7% marker wastage, so no further wastage should be added on top of it. Order B, the denim, needs 4,350 m of fabric, from 1.45 m per piece multiplied by 3,000 pieces. The two totals use different units, kilograms and metres, because Order A's fabric is a knit measured by weight and Order B's denim fabric is a woven measured by length; they are never compared directly against each other.
Getting either total wrong carries a real cost even though this lesson attaches no single dollar figure to it. If Delta Garments' planner added marker wastage a second time to Order A's 0.205 kg per piece, the resulting purchase order would ask Rowad Knits for more fabric than the 3,075 kg the order actually needs, tying up cash in excess knit fabric sitting in the factory's own store. The same double-counting mistake applied to Order B's 1.45 m per piece would over-order woven denim from Suez Denim in the same way. Neither mistake stops production outright, since there would be enough fabric, but both mistakes waste cash that a correct calculation, following this lesson's two-step method, would have kept in the business.
The Fabric calculator (this course's workbook) holds the two calculations worked through in this lesson: Order A's knit consumption by weight and Order B's denim woven consumption by length. Enter a per-piece figure and an order quantity in the yellow input cells, and the white result cell recalculates the total automatically, as a live formula.
| Question | Order A (filled in) | Order B denim (filled in) | Your order |
|---|---|---|---|
| Fabric type | Knit | Woven | |
| Consumption per piece | 0.205 kg | 1.45 m | |
| Order quantity | 15,000 pieces | 3,000 pieces | |
| Total fabric requirement | 3,075 kg | 4,350 m | |
| Marker wastage already included? | Yes, 7% | Not stated separately |
Download the Fabric calculator from the course page and fill in your own order's figures in the third column.
1. Why is a knit's fabric consumption usually stated by weight while a woven's is stated by length?
2. What is Order A's total fabric requirement for its full 15,000-piece order?
3. Should marker wastage be added again on top of Order A's 0.205 kg per-piece figure?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Fabric consumption | استهلاك القماش | Consommation de tissu | Kumaş tüketimi | The amount of fabric, by weight or length, one garment piece uses; the basis for calculating an order's total fabric requirement. |
| Marker wastage | فاقد الماركر | Perte de placement (marker) | Marker firesi | Fabric lost during cutting because pattern pieces never fill a cutting layout perfectly; a separate allowance from combing waste. |
| Knit fabric | قماش تريكو | Tissu tricoté | Örme kumaş | Fabric made by looping yarn, usually sold and cut by weight because roll widths can vary. |
| Woven fabric | قماش منسوج | Tissu chaîne et trame | Dokuma kumaş | Fabric made by crossing threads on a loom. Used for shirts and jeans. |
| GSM | GSM | GSM | GSM | Grams per square metre: the standard way fabric weight is stated. |
| Total fabric requirement | إجمالي احتياج القماش | Besoin total en tissu | Toplam kumaş ihtiyacı | The whole order's fabric quantity, found by multiplying the per-piece consumption figure by the order quantity. |
You can now calculate a whole order's fabric requirement from a per-piece figure and the order quantity. The next lesson looks at a different question: how to convert a fabric's weight between GSM and oz/yd2, so a knit fabric's weight and a woven fabric's weight can be compared on the same scale. Back to the course map