Work out process costing instantly with clear inputs, formula shown and shareable results.
Process costing spreads a period's cost over equivalent units: completed units count fully and partly finished work counts in proportion to its completion. Dividing total cost by equivalent units gives a single rate used both to transfer cost out and to value closing work in progress.
Equivalent units
EU = Units completed + (Closing WIP x Completion %)
Cost per equivalent unit
Cost per EU = Total process cost / Equivalent units
In a full weighted-average computation, yes — material is often complete at the start while conversion is not. This calculator uses a single combined rate.
Under the weighted-average method opening WIP cost is added to the period cost and its units are already inside units completed.