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DIO (Days Inventory Outstanding)

DIO measures how long, on average, inventory stays in the business before being sold. It represents the "inventory duration" component of the financial cycle. Formula: DIO = Average Inventory Units ÷ Average Daily Units Sold

Why It Matters

•A longer DIO means capital remains tied in inventory for more time, slowing down capital rotation.
•A shorter DIO increases capital velocity and reduces working capital needs.
•Margin-based metrics alone do not reflect how long capital is committed before returning as cash — DIO provides that missing timing dimension.
•Operational decisions such as purchasing frequency, safety stock levels, and demand patterns can influence DIO.

Connection to Capital

DIO reflects how long capital remains locked before returning as cash. It is critical for understanding inventory investment efficiency.

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