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Days of Inventory Calculator
Estimates how many days your current stock levels will sustain sales, helping you plan purchasing cycles.
How to Calculate Days of Inventory Calculator
The formula to calculate this metric is straightforward.
Days of Inventory = (Average Inventory Value / Cost of Goods Sold) x 365 (alternatively: 365 / Inventory Turnover Ratio)
A Real-World Example
Scenario: Your retail warehouse maintains an average active stock valuation of $15,000. Your annual recorded Cost of Goods Sold (COGS) figures total $90,000.
Days of Inventory: ($15,000 / $90,000) x 365 = 60.8 days
Your existing stock reserves will sustain your standard sales operations for roughly 61 days.
Why Days of Inventory Calculator Matters for Your Business
- Translates complex abstract asset numbers into an intuitive timeline map of business cash runway.
- Pinpoints slow-moving items early, allowing you to run promotions before the inventory incurs long-term storage fees.
- Helps you plan reliable supplier replenishment windows well ahead of peak sales seasons.
Frequently Asked Questions
What is a safe target for days of inventory?
Most e-commerce operations aim for 30 to 60 days. This provides a safe buffer for standard shipping delays without locking up your operational cash flow.
Why is a very low days of inventory number risky?
If your timeline drops under 15 days, any minor supplier delay or shipping bottleneck will trigger widespread stockouts and unfulfilled customer orders.
How can I optimize my days of inventory runway?
Negotiate more frequent, smaller shipments with local suppliers and prune underperforming SKUs that quietly drain warehouse space.