Cost Per Piece, Measured While the Lot Is Still Running

Most garment factories add up cost per piece after a lot ships. The vendor bills come out, fabric, cutting, making, trims, packing and transport are totalled, and the result is compared with the selling price. Some lots made money and some did not, and by then nothing in the lot can change.

That works as a record of what happened. It does not work as a way to manage the lot while it is still running.

What does cost per piece actually contain?

Cost per piece in a CMT operation is not one number. It is a stack of at least six components, each coming from a different source at a different time.

Fabric cost: total fabric consumed (in kg or metres) multiplied by the rate, divided by pieces produced. This is usually the largest component, often more than half of the total. The accuracy of this number depends entirely on whether you weighed fabric at cutting and tracked waste, or estimated from the purchase invoice.

Cutting charges: what the cutting vendor charged, either per piece or as a lump sum, plus any fabric wastage absorbed in the process.

Making charges per stage: printing, stitching, washing, embroidery, fusing, whatever your product requires. Each stage has its own vendor, its own rate, its own piece count. If 1,000 pieces went to stitching and 970 came out, those 30 rejected pieces still carry the cost of every stage that came before.

Trims and accessories: buttons, labels, tags, hangers, polybags. Small per unit, but across a lot of 5,000 pieces, trim cost is real.

Packing charges: folding, tagging, poly-packing, carton-packing. Often forgotten in estimates.

Additional costs: transport between vendors, sampling charges, re-work, quality inspection. These are the costs that consistently get left out of estimates and consistently show up in actuals.

Why do estimates and actuals diverge?

The selling price is almost always quoted based on an estimate. You know roughly what fabric should cost, roughly what making should cost, and you add a margin. The problem is not that the estimate is wrong. The problem is the gap between "roughly" and "actually."

Fabric consumption variance is the biggest culprit, and most of it is lost in the cutting room. An estimate might assume 280 grams per piece for a romper. Actual consumption depends on the cutting layout, the marker efficiency, the fabric width variation, and waste. At 280 grams a piece, a lot of 5,000 pieces uses 1,400 kg of fabric. At Rs 400 per kg that is Rs 5.6 lakh, so a 5% variance is Rs 28,000 of cost that was never in the estimate. Across ten such lots it is Rs 2.8 lakh.

Vendor rate discrepancies are the second. An agreed stitching rate of Rs 18 per piece gets billed as Rs 20 because of a size difference or a design complexity that was not discussed upfront. Multiply by 5,000 pieces and that Rs 2 gap is Rs 10,000. These discrepancies are caught only if someone compares every bill against every rate agreement, which rarely happens in a busy production cycle.

Rejections are the third. When 50 pieces are rejected at stitching, the fabric cost, cutting cost, and printing cost on those 50 pieces do not disappear. They get absorbed into the cost of the 950 good pieces. Vendor payments alone leave that absorption out, so each good piece costs more than the payments show.

How do you build a cost that updates as production happens?

The alternative to end-of-lot calculation is stage-wise tracking. Every time a cutting entry is made, the fabric cost component updates. Every time a making stage is logged, that cost layer adds to the stack. The cost per piece at any point in the lot's lifecycle reflects everything that has happened so far.

This is not complicated. It requires recording three things at each stage: how many pieces, at what rate, and (for cutting) how much fabric was used. If you already track this information in any form (notebook, WhatsApp message to yourself, a sheet), you have the data. The difference is whether it assembles into a cost per piece in real time or three weeks after the lot ships.

The practical value is simple. When you can see cost building lot by lot while production is running, you make different decisions. You catch the fabric variance at cutting, not at the P&L. You question the vendor rate when the entry is logged, not when you are reconciling bills. You know which lots are making money and which are not before they ship, not after.

In a market where buyers negotiate harder every season and raw material costs keep climbing, knowing your real cost per piece while you can still act on it is not optional. It is how you protect your margins.