Inventory Days Calculator (DSI)
Assess inventory holding efficiency and capital liquidity. Days Sales of Inventory (DSI) calculates the average number of days required for your business to completely sell and liquidate its on-hand inventory stock, highlighting slow-moving assets and stockout hazards.
Carrying balance sheet value of merchandise inventory
Annual direct cost incurred to purchase or manufacture inventory
Average days required to turn inventory into completed customer sales
How to Use This Calculator
- Enter average inventory value from your balance sheet ((Beginning + Ending) / 2).
- Enter total Cost of Goods Sold from your annual income statement.
- Review Days Sales of Inventory (DSI) and annual turnover frequency.
- Benchmark your DSI against peer retailers to identify excess trapped working capital.
Formula & Calculation Methodology
Compares total balance sheet inventory value against daily cost of goods sold to calculate holding duration.
Worked Example
$120,000 average inventory with $720,000 annual Cost of Goods Sold
Frequently Asked Questions
What is a typical healthy DSI range in retail?↓
DSI varies substantially by product perishability. Fast-moving consumer goods and grocery retailers operate at 20 to 30 days of inventory, apparel retailers target 60 to 90 days, and industrial machinery dealers often operate at 120 to 180 days.
Why is a shorter DSI generally advantageous?↓
Shorter DSI means capital converts rapidly back into liquid cash, reducing storage rental fees, insurance premiums, obsolescence risk, and markdown clearance losses.
Can an inventory DSI be too short?↓
Yes. An excessively short DSI (e.g., under 10 days in non-perishable goods) indicates minimal safety stock, leaving the business vulnerable to supply chain delays, freight spikes, and lost sales from stockouts.
How does DSI integrate into the Cash Conversion Cycle (CCC)?↓
The Cash Conversion Cycle formula is: CCC = DSI + DSO (Days Sales Outstanding) - DPO (Days Payable Outstanding). It measures total days cash is trapped from inventory purchase to customer collection.
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Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.