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Average Cost Method (Periodic Inventory)

Also called the weighted-average method, this costing method pools all the available units into a single batch with an average cost per unit.

Characteristics of the Average Cost Method

  • A single average cost is found at the the end of the period
  • COGS is based on the average cost at the time of sale

Average Cost Formula:


Image illustrating Average Cost Method (Periodic Inventory)




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Example: Average Cost Method (Periodic Inventory)

The following transactions took place during August 2020, all purchases and sales were on account.



Image illustrating Example




Using the weighted average method and periodic inventory system:

  1. What is the correct amount of cost of goods sold for the month?
  2. What is the correct amount that should be reported as inventory on August 31st, 2020?

Practice: Average Cost (Periodic Inventory)

ABC Inc. had the following transactions affecting inventory during 2020, the company uses the average cost method and the periodic inventory system:



Illustration for practice question: Practice: Average Cost (Periodic Inventory)


All transactions are on account.


What is the total cost of goods sold that should be recorded for the year?

Round unit costs to 4 decimal places and final answer to 2 decimal places.

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