Calculating True Cost per Piece in a Textile Plant: A Worked Example

Why cost per piece matters in textile manufacturing

A single rupee difference in cost per piece can decide whether a contract is profitable or loss-making. Many plants rely on standard rates or last year’s averages, but yarn prices, dye costs, electricity tariffs and wages change monthly. Without a method that ties actual material issued, labour hours and overheads to each production batch, decisions on pricing, sourcing and process changes are made in the dark.

Material cost: from yarn to finished fabric

Material cost starts at the store issue voucher. Every kilogram of yarn, dye, chemical and trim must be recorded against the production order. In textile plants that run one stock ledger for every store, batch and rack, negative stock is eliminated and consumption is always traceable.

For woven fabric, the bill of material lists:

• Yarn count, shade and supplier batch number for warp and weft.
• Dyes and chemicals with actual consumption per kilo of fabric, not standard recipes.
• Trims such as labels, buttons and zippers if the plant also does stitching.

In knitting or dyeing plants, the same principle applies: record what was issued, not what the recipe card says should have been used. Fugen ERP posts material issues directly to the production order, so the cost per kilo of fabric is updated in real time.

Conversion cost: labour and machine time

Conversion cost covers the direct labour and machine time that turn raw material into finished fabric. In textile plants, labour is typically recorded in two ways:

• Piece-rate wages for stitching or packing lines, where the operator is paid per dozen or per hundred pieces.
• Daily wages for loom operators, dyehouse staff and finishing crews, where attendance is marked and hours are allocated to production orders.

Machine time is recorded per shift. A loom running 24 hours a day at 85% efficiency will produce more metres than one running at 70%. The system must capture actual output per shift, not just planned output. Fugen ERP ties production orders to machine loading, so conversion cost per metre is based on real hours, not standard hours.

Utilities and overheads: allocation methods

Utilities—electricity, steam, water and compressed air—are consumed by machines, not by individual pieces. Overheads such as rent, insurance and supervisory salaries are also indirect costs. Both must be allocated to production orders to arrive at true cost per piece.

Common allocation bases in textile plants:

• Machine hours: total utility cost divided by total machine hours, then multiplied by the hours the order ran.
• Production volume: total overhead divided by total kilos or metres produced, then multiplied by the kilos or metres in the order.
• Direct labour hours: total overhead divided by total direct labour hours, then multiplied by the hours worked on the order.

The choice depends on which driver best reflects consumption. In a loom shed, machine hours are the obvious choice; in a stitching line, direct labour hours may be more accurate.

Worked example: cost per metre for a woven fabric

Illustration: 5 000 metres of 120 GSM cotton poplin, order #POP-24-045.

Notes on the illustration:

• Material cost includes 2% waste on yarn and 5% on dyes, based on actual issues.
• Electricity is allocated at ₹8.50 per kWh, the industrial tariff for the month.
• Overheads are allocated at ₹3.00 per metre, the rate for the previous quarter.
• No rework or seconds are included; if 200 metres are downgraded, the cost per metre of first-quality fabric rises to ₹49.12.

Handling waste, rework and seconds

Waste and rework distort cost per piece. If 5% of yarn is wasted but the bill of material assumes zero waste, the cost per metre is understated. Similarly, if 100 metres of fabric are dyed twice because the first attempt failed, the cost of the second dye bath must be added to the order.

Fugen ERP captures waste and rework as separate transactions. Waste is written off to a scrap account; rework is posted to the original production order. Seconds are costed separately and sold at a lower price, so the cost per metre of first-quality fabric remains accurate.

When software is not the answer

If the plant does not record material issues, labour hours or machine output, no ERP can calculate true cost per piece. Before investing in software, the plant must:

• Issue material only against production orders, not against blanket requisitions.
• Record actual labour hours per order, not just attendance.
• Capture actual output per shift, not just planned output.
• Measure utilities at the machine level, not just at the meter.

Without these disciplines, costing is guesswork, whether done on paper or in an ERP.

What to do next week

Start with one production order that ran last week.

1. Pull the material issue vouchers and verify the quantities against the bill of material.
2. Check the labour hours recorded for the order; if they are missing, ask the shift supervisor to estimate.
3. Note the machine hours the order ran and the actual output in metres or kilos.
4. Allocate utilities and overheads using the method the plant currently uses.
5. Calculate cost per piece manually and compare it to the standard rate.
6. Repeat for two more orders; if the gap between actual and standard is more than 5%, review the costing process.

Once the manual process is reliable, consider a system that automates the calculation. Fugen ERP’s product costing module builds cost per piece from actual transactions, so the number is always up to date and always tied to the general ledger.