📦 DIO Calculator
Calculate Days Inventory Outstanding (DIO), showing on average how many days it takes to sell through your inventory.
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What is Days Inventory Outstanding?
Days Inventory Outstanding (DIO) measures the average number of days a company holds inventory before selling it. A lower DIO generally indicates more efficient inventory management, though the ideal level varies by industry.
The formula
DIO = (Average Inventory / Cost of Goods Sold) × Number of Days in Period. This calculator also shows inventory turnover, the number of times inventory is sold and replaced over the period.
This calculator is for general financial education and analysis purposes.
Last reviewed August 2026