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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:



Wize Tip
"Available for sale" is the sum of the beginning inventory and all the purchases.

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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.





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:



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.