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Weighted average process costing

Weighted average process costing combines opening work-in-progress cost with current-period cost and spreads the combined amount over equivalent output. It does not isolate the work needed to finish opening units in the same way as a FIFO process method. Calculate equivalent units by cost element and assign costs consistently to completed output and closing work in progress. This process method is distinct from weighted average material-issue pricing; retain the context when linking the shared phrase.

Worked example

Opening conversion cost $1,000 plus current conversion cost $9,000 is divided by 2,000 weighted-average equivalent conversion units, giving $5 per equivalent unit.

Common mistake

Do not use a stores weighted-average unit price as a substitute for process equivalent-unit calculations, or mix weighted-average costs with FIFO equivalent units.

Where it appears in your exams

QualificationExamRelationshipPeriod
ACCA MA Supporting September 2026–June 2027
FIA FMA Supporting September 2026–June 2027