• The average cost method is one of the three inventory valuation methods, and the other two common methods are first in, first out (FIFO) and last in, first out (LIFO).

  • The average cost method uses the weighted average of all inventory purchased in a period to determine the cost of goods sold (COGS) as well as the cost of goods still available for sale.
  • Once a company chooses an inventory valuation method, it must remain consistent in its use in order to comply with generally accepted accounting principles (GAAP).