Days of Inventory Calculator Online

Last updated on by Editorial Staff

Days of Inventory Calculator

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Quick Guide to Use this Calculator

  • Select the period (year, week, quarter, or month) from the dropdown menu.
  • Enter the beginning inventory, ending inventory, and cost of goods sold.
  • Click the “Calculate” button to get the days of inventory.

It calculates the average number of days it takes for a company to sell its entire inventory during a specific period. 


Days of inventory =  (Average inventory in selected period/cost of goods sold in the same period) / Number of days in that period

What is Days of Inventory?

Days of Inventory is a financial metric that measures how many days it takes for a company to sell its average inventory.

Who Can Use this Calculator?

Business owners, financial analysts, and anyone involved in inventory management can use this calculator.

Which Industries Can Use this Calculator?

Retail, manufacturing, wholesale, and any industry that deals with inventory management can benefit from this calculator.

Benefits of Using this Calculator

  • Quickly determine the efficiency of inventory management.
  • Gain insights into inventory turnover and liquidity.
  • Make informed decisions to optimize inventory levels.


Can I use this calculator for any period?

Yes, you can select the period as per your requirement (year, week, quarter, or month). But typically considers a year.


The Days of Inventory Calculator provides a simple yet powerful tool to assess and optimize inventory management practices.

By understanding how long it takes to sell inventory, businesses can streamline operations and improve profitability.