How the Days of Inventory Calculator works
Days of inventory is the simplest stock health metric: how long you can keep selling before shelves are empty.
Formula
- Days of inventory = Units on hand ÷ Average daily sales
- Stockout date = Today + Days of inventory
Example
75 days of stock; the incoming order lands in time.
Units in stock: 450Average daily sales: 6Incoming units (optional): 500Incoming arrives in (days): 40
Frequently asked questions
Which sales average?
Trailing 30 days for stable products; 7 days when trending.