Days of Inventory Calculator
Estimate days inventory outstanding.
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Calculate days of inventory
Days of inventory estimates how long average inventory would last at the current cost-of-goods-sold rate. Enter average inventory, COGS for the period and period days to calculate days of inventory and turns per period. It is useful for retail finance, ecommerce planning, cash-flow reviews and inventory health checks.
Inventory days view
The result helps translate inventory value into an easier-to-read time measure.
Frequently asked questions
Is this the same as inventory turnover?
It is related. Days of inventory converts turnover into a time period.
What period should I use?
Use 365 for annual COGS, or the actual days in the reporting period.
Can this be used for units?
It works best with consistent value inputs, such as average inventory value and COGS.