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
| Qualification | Exam | Relationship | Period |
|---|---|---|---|
| ACCA | MA | Supporting | September 2026–June 2027 |
| FIA | FMA | Supporting | September 2026–June 2027 |
