- Average cost method
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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.
The 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.
There are two commonly used average cost methods: Simple Weighted-average cost method and moving-average cost method.
Weighted Average Cost
Weighted Average Cost is a method of calculating Ending Inventory cost. It is also known as AVCO
It takes Cost of Goods Available for Sale and divides it by the total amount of goods from Beginning Inventory and Purchases. This gives a Weighted Average Cost per Unit. A physical count is then performed on the ending inventory to determine the amount of goods left. Finally, this amount is multiplied by Weighted Average Cost per Unit to give an estimate of ending inventory cost.
Moving-Average (Unit) Cost is a method of calculating Ending Inventory cost.
Assume that both Beginning Inventory and beginning inventory cost are known. From them the Cost per Unit of Beginning Inventory can be calculated. During the year, multiple purchases were made. Each time, purchase costs are added to beginning inventory cost to get Cost of Current Inventory. Similarly, the number of units bought is added to beginning inventory to get Current Goods Available for Sale. After each purchase, Cost of Current Inventory is divided by Current Goods Available for Sale to get Current Cost per Unit on Goods. Also during the year, multiple sales happened.
The Current Goods Available for Sale is deducted by the amount of goods sold, and the Cost of Current Inventory is deducted by the amount of goods sold times the latest (before this sale) Current Cost per Unit on Goods. This deducted amount is added to Cost of Goods Sold.
At the end of the year, the last Cost per Unit on Goods, along with a physical count, is used to determine ending inventory cost.
- Intermediate Accounting 8th Canadian Edition, page 447, Kieso, Weygandt, Warfield, Young, Wiecek, John Wiley & Sons Canada, Ltd, 2007, ISBN 978-0-470-83979-9
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