This page teaches a merchandiser, buyer or factory planner how to turn one order's fixed fabric facts into the yarn quantity that must be ordered from a spinning mill. It closes Course 3 by combining what the earlier lessons taught: the spinning process, yarn count systems, ply and twist, and the extra raw-cotton input combed yarn needs.
Without this skill, a person either orders the wrong amount of yarn or confuses two different figures that sound alike. A buyer who cannot calculate the finished-yarn quantity an order needs has no way to check a factory's own numbers before production starts. A planner who does not know that a combed mill's raw-cotton input is higher than the finished-yarn weight can read a mill's quoted figure and think the order has grown, when it has not. This mainly teaches the money flow: getting the yarn quantity right affects what the mill invoices and what the buyer expects to pay for.
The core calculation is one multiplication most people can do without help. The real skill is knowing which of two related numbers you are looking at, and why a mill's own raw-cotton figure is not the number a buyer should be invoiced against.
You need: Course 3's earlier lessons: the spinning process (Lesson 3.1), Ne and Tex counts (Lesson 3.2), ply and twist (Lesson 3.3), and combed versus carded yarn and its raw-material allowance (Lesson 3.4).
By the end of this lesson you can:
Not covered here: how the spinning process itself works (Lesson 3.1), converting between Ne and Tex (Lesson 3.2), how yarn faults are tested and reported (Course 4).
| Term | Meaning |
|---|---|
| Yarn count (Ne) | A number describing how fine a yarn is in the English cotton count system. A higher count number means a finer yarn. |
| Combing waste | The percentage of raw fibre removed as short fibre during combing. It is a real cost, not a fault, because it is what makes combed yarn smoother. |
| Marker wastage | Fabric lost during cutting because pattern pieces never fill a cutting layout perfectly; a separate allowance from combing waste. |
| Finished-yarn requirement | The total weight of yarn an order actually consumes, the buyer-facing figure a mill is invoiced against. |
| Raw-cotton input | The weight of raw cotton a spinning mill must buy to produce a given weight of combed yarn, once combing waste is accounted for. |
| Minimum order quantity | The smallest amount a mill will accept or process as one order, which a calculated yarn requirement is often rounded up to. |
This is the general rule for any order, in any fabric: total finished-yarn weight equals fabric weight per piece multiplied by the number of pieces. The fabric weight per piece must already include any cutting allowance, such as marker wastage, so the total reflects what the cutting room actually consumes, not a smaller theoretical figure. This one multiplication is the starting point every yarn-requirement calculation shares, whatever the yarn count, ply or fibre involved. A merchandiser who can do only this much already has enough to sanity-check a mill's own paperwork, because the total should always trace back to a per-piece weight and a piece count that both appear elsewhere in the order.
Getting this first step right matters more than it looks, because every later step in this lesson builds on it. If the per-piece weight is wrong, or if it silently drops the cutting allowance, the whole chain of figures that follows, the finished-yarn total, the mill's raw-cotton estimate and any rounding to a lot size, is wrong in the same proportion, and nobody downstream would necessarily notice.
The multiplication itself never changes, but a merchandiser meets real differences in what feeds into it and what happens to the answer afterwards. Knowing these variants stops a person from treating Order A's own shape as the only shape a yarn calculation ever takes.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Yarn type | Combed cotton, carded cotton, a synthetic fibre with no combing step | Only combed yarn adds the mill-side raw-cotton allowance; carded and synthetic yarns skip that extra step entirely. |
| Order market | Export orders like Northline Apparel's, domestic orders sold on open account | Every order still needs the same finished-yarn calculation; only the paperwork and payment terms around it change. |
| Order shape | Make to Order, Make to Stock, a hybrid line splitting styles between the two | A Make to Order factory calculates one order's yarn at a time; a Make to Stock or hybrid line often pools several styles' yarn into one mill purchase. |
| Product family | Knitted T-shirts, socks and hosiery, terry towels, home-textile bedding | Fabric weight per piece is worked out differently for each family, but the same multiplication by total pieces still applies once that weight is known. |
| Rounding practice | Rounding up to a mill's minimum order quantity, rounding to a standard lot size | A calculated figure like 3,075 kg is rarely the exact quantity ordered; the mill's own minimums decide the real order size. |
Order A is Northline Apparel's basic cotton T-shirt: 15,000 pieces, single jersey fabric at 0.205 kg per piece including 7% marker wastage, spun from Ne 30/1 combed cotton. Delta Garments buys this fabric from Rowad Knits, the knitting mill fixed in the master cast, which in turn is supplied with yarn by Nile Spinning, the spinning mill. Before Delta Garments can schedule sewing, Sara needs confirmation that Nile Spinning can supply enough Ne 30/1 combed cotton yarn for the whole order, so this lesson's calculation sits between a buyer's approval and a factory's production plan.
The worked numberStep one uses Order A's own fixed facts: 0.205 kg of fabric per piece, including the 7% marker wastage, times 15,000 pieces, gives the order's total finished-yarn requirement.
This 3,075 kg is the buyer-facing figure: the weight of Ne 30/1 combed cotton yarn Order A actually consumes, and the quantity Northline Apparel should expect to be invoiced against.
Step two belongs to Nile Spinning, not to Northline Apparel. Because this yarn is combed, Nile Spinning must buy more raw cotton than 3,075 kg, since combing removes a percentage of fibre as waste. Using Lesson 3.4's roughly 15% midpoint estimate for combing waste, Nile Spinning's raw-cotton input works out to about 3,075 kg divided by (1 minus 0.15), which is close to 3,618 kg of raw cotton. The gap between the two figures, shown below, is combing waste, not extra yarn for the order.
A common mistake is treating the mill's raw-cotton figure as the amount the buyer is ordering. This overstates the order: the buyer only needs and pays for the finished-yarn weight, not the extra raw cotton the mill consumes internally to produce it. When a factory relays a mill's raw-cotton number without saying what it is, a buyer can wrongly conclude the order has grown or the price will rise, creating a planning dispute that a clearer label on the figure would have avoided from the start.
This lesson shows how to work out how much yarn an order needs. Take the weight of fabric in one piece, multiply it by how many pieces are being made, and that gives the total yarn weight the order uses. If the yarn is a smoother, more expensive type, the mill making it has to start with more raw material than the finished weight, because some of it is removed to make the yarn smooth. That extra amount is the mill's own cost, not something added to what the buyer is buying. Keeping these two numbers separate stops a simple mix-up from looking like the order has grown when it has not.
Sara, the buyer at Northline Apparel, asks Delta Garments to confirm that Nile Spinning has enough yarn capacity for Order A's next production run before she approves the schedule. Delta Garments replies with a single figure, and Sara compares it against her own calculation from the order's fixed facts.
Is Delta Garments' figure wrong, or is Sara's own expectation missing something?
Delta Garments' figure is correct, but for a different quantity than Sara was expecting. The 3,618 kg is Nile Spinning's raw-cotton input, which already accounts for the roughly 15% combing-waste allowance from Lesson 3.4, not the finished-yarn weight Order A itself requires. Sara's own calculation, 0.205 kg times 15,000 pieces equals 3,075 kg, is the buyer-facing figure she should expect to be invoiced against and to plan her production schedule around. Delta Garments should have named which figure it was quoting; without that label, Sara could have mistakenly approved a schedule based on the wrong number, or queried a price rise that was never real.
Confusing these two figures carries no fixed dollar figure of its own here, since neither number changes what Northline Apparel actually pays; the cost is in the planning risk. If Sara had accepted 3,618 kg as the order's finished-yarn quantity, she could have queried Delta Garments over an apparent 543 kg increase in fabric use that never happened, delaying approval of a production schedule that was already correct. If a factory instead quoted the smaller, finished-yarn figure to a mill expecting to be paid for its raw-cotton input, the mismatch could equally stall a purchase order on the mill's side. The three-step method in this lesson, labelling each figure as it is produced, is what prevents both directions of this mistake.
The Yarn calculator (this course's workbook) holds the same two-step calculation worked through in this lesson: multiplying fabric weight per piece by total pieces for the finished-yarn figure, then applying the combing-waste allowance for the mill's raw-cotton input. Enter your own order's fabric weight, piece count and combing-waste estimate in the yellow input cells, and the white result cells recalculate automatically.
| Question | Order A (filled in) | Your order |
|---|---|---|
| Fabric weight per piece, including any cutting allowance | 0.205 kg | |
| Total pieces | 15,000 | |
| Total finished-yarn requirement | 3,075 kg | |
| Is the yarn combed? | Yes | |
| Estimated raw-cotton input (if combed) | About 3,618 kg |
Download the Yarn calculator from the course page and fill in your own order's figures alongside Order A's.
1. What is Order A's total finished-yarn requirement?
2. Why is Nile Spinning's raw-cotton input higher than Order A's finished-yarn figure?
3. A different mill quotes a domestic Make to Stock order's raw-cotton input as 4,600 kg for a combed yarn using the same 15% combing-waste estimate. About what is the order's own finished-yarn requirement?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Yarn count (Ne) | رقم الغزل (نظام Ne) | Numéro de fil (Ne) | İplik numarası (Ne sistemi) | A number describing how fine a yarn is in the English cotton count system. A higher count number means a finer yarn. |
| Combing waste | فاقد التمشيط | Déchets de peignage | Tarama (penye) fire oranı | The percentage of raw fibre removed as short fibre during combing. It is a real cost, not a fault, because it is what makes combed yarn smoother. |
| 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. |
| Finished-yarn requirement | احتياج الغزل الجاهز | Besoin en fil fini | Bitmiş iplik ihtiyacı | The total weight of yarn an order actually consumes, the buyer-facing figure a mill is invoiced against. |
| Raw-cotton input | مدخل القطن الخام | Apport de coton brut | Ham pamuk girdisi | The weight of raw cotton a spinning mill must buy to produce a given weight of combed yarn, once combing waste is accounted for. |
| Minimum order quantity | الحد الأدنى لكمية الطلب | Quantité minimale de commande | Minimum sipariş miktarı | The smallest amount a mill will accept or process as one order, which a calculated yarn requirement is often rounded up to. |
You can now turn an order's fabric weight into a yarn quantity. The next course looks at a different question: once the yarn arrives, how do you tell whether it is actually good, using evenness, strength and count consistency. Back to the course map