The Number of Days of Inventory is an activity ratio that represents the average number of days required for a firm to convert its inventory into sales. It is equal to the number of days in a period divided by the inventory ratio for the period.
Some other related topics you might be interested to explore are Inventory Turnover, Operating Cycle, and Net Operating Cycle.
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Number of Days of Inventory is among the topics included in the Corporate Finance module of the CFA Level 1 Curriculum.