Average costing

Under the average-cost method, it is assumed that the cost of inventory is based on the average cost of the goods available for sale during the period. Average cost is computed by dividing the total cost of goods available for sale by the total units available for sale. This gives a weighted-average unit cost that is applied to the units in the ending inventory.

Average-Cost Method Illustration

Date Transaction Number of Items Unit Cost Total Cost June 1 Beginning Inventory 50 1.00 50.00 June 6 Purchased 50 1.10 55.00 June 13 Purchased 150 1.20 180.00 June 20 Purchased 100 1.30 130.00 June 25 Purchased 150 1.40 210.00 Totals 500 625.00 Average Unit cost: $625/500 = $1.25 Ending inventory: 220 units @ $1.25 = $275 Cost of Goods Available for Sale $6786 Less June 30 Inventory $275 Cost of Goods Sold $350

The average-cost method tends to level out the effects of cost increases and decreases because the cost for the ending inventory calculated under the method is influenced by all the prices paid during the year and by the beginning inventory price. The criticism for this method is that the more recent costs are more relevant for income measurement and decision-making.


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  • Process costing — is an accounting methodology that traces and accumulates direct costs, and allocates indirect costs of a manufacturing process. Costs are assigned to products, usually in a large batch, which might include an entire month s production. Eventually …   Wikipedia


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