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Inventory Turnover Days
Overview
Inventory Turnover Days are the number of days on average it takes to sell a stock of inventory.
This formula is derived using the previously mentioned inventory turnover ratio. Like the inventory
turnover ratio, inventory turnover days is a measure of a business’ efficiency.
Formula
Interpretation
To calculate this ratio, the inventory turnover ratio is necessary:
Inventory Turnover Ratio = Cost of Goods Sold/Average Inventory
Using the same example, a company has cost of goods sold of $3 million for the fiscal year. On
December 31
st
, the company’s inventory was $350,000. On January 1
st
, inventory was $260,000.
Therefore, the company’s inventory turnover ratio would be = 3,000,000 / ((35,000 + 26,000) / 2) =
9.84. This number means that the company sold its entire stock of inventory 9.84 times in the fiscal
year. We can use these numbers to calculate the inventory turnover days, which would be = 365 /
9.84 = 37.1.
Analyzing this, it takes the company 37.1 days on average to sell an entire stock of inventory. As
with the inventory turnover ratio, this number should be compared to industry averages to see how
efficient the company is in converting inventory into sales versus its competitors.
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