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Unit production cost: formula and example

Unit cost is the full production cost allocated to one good unit. It is used for pricing, margin planning, and comparing SKUs/lines; it is important to separate full and variable cost.

What the Metric Measures

The cost of materials, labor, and manufacturing overhead required to produce one good unit. It reflects process efficiency and planning quality.

Calculation

  • COGM = Beginning WIP + (Materials + Labor + Overhead) − Ending WIP
  • Cost per unit (full) = COGM / Number of good units
  • Cost per unit (variable) = (Variable costs) / Number of good units
  • Allocate fixed overhead based on normal volume (hours/machine hours)
  • Batch costs (setup/QA) / batch size → into unit cost
  • Account for scrap/rework and yield loss

Calculation example

5,000 items were produced in a month. Materials cost 1,250,000, direct labour 400,000 and production overheads (energy, equipment depreciation, shop costs) 350,000. Unit cost = (1,250,000 + 400,000 + 350,000) / 5,000 = 400, of which materials are 62.5%.

Data Sources

ERP/1C (BOM, routings, cost estimates), MES/SCADA (times, downtime, FPY), CMMS (repairs), energy meters, labor timesheets, cost center rate reference lists, WMS.

Interpretation

  • Cost↓ — productivity↑, yield↑, setup↓, less downtime/scrap, better procurement
  • Cost↑ — underutilization, rising material/energy prices, scrap/rework, long changeovers
  • Analyze together with margin, OEE, WIP, capacity utilization, OTIF

Useful Breakdowns

  • SKUs / families; lines / shops; shifts / days
  • Materials (A/B/C); energy sources
  • Batches; equivalent units / standard hours
  • Utilization scenarios: standard vs. actual

Dashboard Visualizations

  • Waterfall of unit cost by component
  • Pareto of materials and energy
  • Unit cost trend by SKU/line
  • Variances: material price/usage; labor rate/efficiency; overhead
  • The relationship utilization → cost per unit

How to Set Targets

Set a target cost based on the price corridor and planned margin; update standards (BOM/norms/routings) regularly; establish a normal base for overhead allocation and a cost-down program (SMED, yield, energy efficiency).

Common Mistakes

  • Mixing standard and actual cost
  • Allocating overhead based on theoretical 24/7 capacity
  • Unaccounted scrap/rework and batch costs
  • Outdated BOMs/norms; double-counting of energy/repairs
  • Different currencies/VAT; using planned output instead of good output

Questions for Discussion

  • Which component will deliver the biggest cost-down effect — materials, labor, or energy?
  • What would −30% setup per batch deliver?
  • What yield ensures the target margin at current prices?
  • What is the normal overhead allocation base for your lines?

Questions and answers

How do you calculate unit production cost?

Unit cost = (materials + direct labour + production overheads) for the period / number of units produced in the same period.

What does production cost include?

Raw materials, components, production wages, energy, equipment depreciation and shop overheads. Administrative and selling expenses are excluded.

How do you reduce unit cost?

Negotiate better material prices, reduce scrap and losses, and raise equipment utilisation and labour productivity.