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Inventory Turnover Ratio & Days Sales of Inventory (DSI

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### Working Capital Management: The Cash Conversion Cycle (CCC) **Days Sales of Inventory (DSI)** measures the average number of days required for.

Reviewed by Noman Khan · MBA
Last updated:
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⚙ Input Values

📊 Results

Primary Inventory Turnover & DSI Summary
Turnover: 6.00x/period ➔ DSI: 60.8 Days to Sell (Avg Inventory: $300,000 | GMROI: 3.17x)
Inventory Turnover Ratio (ITR in Turns / Period)
6.00 Turns / Period (ITR)
Days Sales of Inventory (DSI / Days to Sell Stock)
60.8 Days (Days Sales of Inventory -- DSI)
Average Inventory Value ($)
$300,000 (Average Stock Balance)
Gross Margin Return on Investment (GMROI)
3.17x GMROI ($3.17 Gross Profit per $1.00 Inventory)
Annual Inventory Holding / Carrying Cost Drain ($)
$66,000 / year (22% Carrying Cost)
Gross Profit Generated ($)
$950,000 (Revenue $2,750,000 - COGS)
✦ Working Capital Velocity & Inventory Efficiency Diagnostic
Inventory Turnover & Liquidity Analysis: Across $1,800,000 in COGS and an Average Inventory of $300,000 ($280,000 start / $320,000 end): The Inventory Turnover Ratio (ITR) is 6.00 turns per year, taking an average of 60.8 Days to Sell Inventory (DSI / Days Inventory Outstanding DIO). Financial Productivity: Gross Margin Return on Investment (GMROI) is 3.17x ($3.17 gross profit earned per $1.00 tied up in stock across $950,000 gross profit). At a 22.0% carrying cost rate, your inventory incurs $66,000/year in storage, insurance, and working capital interest expense. Inventory Health: HEALTHY TURNOVER (ITR 4.0x - 7.9x | DSI 45-90 days): Standard healthy baseline for consumer retail and manufacturing.
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📐 Formula

Inventory turnover, Days Sales of Inventory (DSI) & GMROI formulas: Inventory Value = Beginning Inventory + Ending Inventory2 Turnover Ratio (ITR) = Cost of Goods Sold (COGS)Average Inventory Value Sales of Inventory (DSI / DIO) = ( Average InventoryCOGS) × Period Days = Period DaysITR Margin Return on Investment (GMROI) = Gross Profit (Revenue - COGS)Average Inventory Value Carrying Cost Drain = Average Inventory Value × Holding Cost Rate (%)

💡 Practical Example

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For example, managing a retail business with $1,800,000 in annual COGS, $2,750,000 in revenue ($950,000 gross profit), $280,000 beginning inventory, and $320,000 ending inventory ($300,000 average inventory) with 22% holding costs: \. Days Sales of Inventory is \. GMROI is \, while inventory carrying costs total $66,000.00/year.

📖 About Inventory Turnover Ratio & Days Sales of Inventory (DSI

Working Capital Management: The Cash Conversion Cycle (CCC)

Days Sales of Inventory (DSI) measures the average number of days required for a business to convert physical inventory into sales:

  • Lower DSI is Better: Indicates efficient inventory management, faster cash recovery, and minimal dead stock risk.
  • GMROI (Gross Margin Return on Investment): Measures how effectively working capital turns into gross profit (a GMROI above 3.0x indicates world-class merchandising).

How to Use This Calculator

Enter your Cost of Goods Sold (COGS in / period) (e.g. 1800000), Beginning Inventory ( at start of period) (e.g. 280000), Ending Inventory ( at end of period) (e.g. 320000), Total Gross Sales / Revenue ( / period) [for GMROI] (e.g. 2750000), Measurement Period Horizon — choose from Annual (365 Days), Quarterly (90 Days), Monthly (30 Days), and Annual Inventory Holding / Carrying Cost Rate (%) (e.g. 22.0 (Storage, insurance, capital cost)). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Inventory turnover, Days Sales of Inventory (DSI) & GMROI formulas: Inventory Value = (Beginning Inventory + Ending Inventory) / (2) Turnover Ratio (ITR) = (Cost of Goods Sold (COGS)) / (Average Inventory Value) Sales of Inventory (DSI / DIO) = ((Average Inventory) / (COGS)) × Period Days = (Period Days) / (ITR) Margin Return on Investment (GMROI) = (Gross Profit (Revenue - COGS)) / (Average Inventory Value) Carrying Cost Drain = Average Inventory Value × Holding Cost Rate (\%)

Worked Example

For example, managing a retail business with 1,800,000 in annual COGS, 2,750,000 in revenue (950,000 gross profit), 280,000 beginning inventory, and 320,000 ending inventory (300,000 average inventory) with 22% holding costs: . Days Sales of Inventory is . GMROI is \, while inventory carrying costs total 66,000.00/year.

Understanding Your Result

Optimal inventory management balances holding costs (typically 20–30% of inventory value annually: storage, insurance, obsolescence, capital cost) against ordering costs. EOQ minimizes the total of these two cost types. Safety stock protects against demand variability and lead time variability — the standard formula uses service level z-scores: 95% service level z=1.645, 99% z=2.

  • Days inventory outstanding (DIO) benchmark: retail 30–60 days, manufacturing 50–80 days, distribution 20–40 days. Below industry average DIO is generally better.

💡 Methodological Standards & Calculation Accuracy

  • All calculations are performed client-side in your browser using verified, standards-compliant mathematical algorithms.
  • Results are provided for educational and informational analysis; verify critical applications with certified domain specialists.
  • Ensure input values are entered in consistent units matching the selector options to guarantee accurate outputs.
  • Periodic recalibration is recommended whenever baseline assumptions, operating parameters, or external conditions change.
Sources: NIST Standards · ISO International Standards

Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.

❓ Frequently Asked Questions

What is the Inventory Turnover Ratio?
The Inventory Turnover Ratio measures how many times a company sells and replaces its stock of goods over a given period.

What is Days Sales of Inventory (DSI)?
DSI (or Days Inventory Outstanding) measures the average number of days it takes to sell through inventory: DSI = (Average Inventory ÷ COGS) × 365 Days.

Why is COGS used instead of Revenue in the turnover formula?
Inventory on the balance sheet is valued at cost (not retail sales price); using Revenue artificially inflates the turnover ratio by mixing retail markups with cost-basis inventory.

What is GMROI?
GMROI (Gross Margin Return on Investment) evaluates inventory profitability by dividing total gross profit by average inventory cost.

What is a good inventory turnover ratio?
Across general retail, an inventory turnover ratio between 4.0x and 8.0x (45 to 90 days DSI) is considered healthy.

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