What is Inventory Turnover?
Inventory turnover ratio measures how many times a company sells and replaces its inventory during a period. It's calculated as Cost of Goods Sold divided by Average Inventory. Higher turnover indicates efficient inventory management, while lower turnover suggests overstocking or weak sales.
Days Sales of Inventory (DSI) shows how many days it takes to sell inventory on average. It's calculated as 365 divided by the inventory turnover ratio. Lower DSI indicates faster inventory conversion to cash, which improves working capital and reduces holding costs.
How to Use This Calculator
Step 1: Enter cost of goods sold for the period.
Step 2: Input beginning inventory value at period start.
Step 3: Input ending inventory value at period end.
Step 4: Select period length (yearly, quarterly, monthly).
Step 5: Click "Calculate" to see turnover ratio and DSI.
Inventory Turnover Examples
Example 1 - Retail Store: COGS $500,000, beginning inventory $80,000, ending inventory $100,000. Average inventory = $90,000. Turnover = $500,000 / $90,000 = 5.56. DSI = 365 / 5.56 = 66 days. Healthy retail turnover, inventory sells every 2 months.
Example 2 - Grocery Store: COGS $1,200,000, beginning inventory $40,000, ending inventory $50,000. Average inventory = $45,000. Turnover = $1,200,000 / $45,000 = 26.67. DSI = 365 / 26.67 = 14 days. Very high turnover typical for perishable goods.
Example 3 - Furniture Store: COGS $300,000, beginning inventory $150,000, ending inventory $170,000. Average inventory = $160,000. Turnover = $300,000 / $160,000 = 1.88. DSI = 365 / 1.88 = 194 days. Low turnover typical for slow-moving, high-value items.
Inventory Management Tips
- Know Your Industry: Compare your turnover to industry benchmarks. Retail typically 4-6, grocery 12-20, manufacturing 3-5, and furniture 1-2. Understand what's normal for your business.
- Optimize Stock Levels: Use just-in-time inventory to reduce carrying costs. Balance stock availability with holding costs. Excess inventory ties up cash and risks obsolescence.
- Forecast Demand: Use sales data and seasonal patterns to predict demand accurately. Better forecasting prevents overstocking and stockouts.
- ABC Analysis: Categorize inventory by value and turnover. Focus management attention on high-value items (A items) while simplifying controls for low-value items (C items).
- Monitor Slow-Movers: Identify items with low turnover and take action: discount, bundle, or discontinue. Don't let dead stock accumulate.
- Improve Supplier Relationships: Negotiate better terms, faster deliveries, and flexible ordering. This reduces the need for safety stock while maintaining availability.
- Track Metrics Weekly: Monitor turnover by product category weekly. Identify trends early and adjust ordering before problems become critical.
- Consider Dropshipping: For slow-moving or high-risk items, consider dropshipping to eliminate inventory holding costs entirely.
Frequently Asked Questions
What is a good inventory turnover ratio?
Good ratios vary by industry: retail 4-6, grocery 12-20, manufacturing 3-5, wholesale 5-8, and furniture 1-3. Higher is generally better, but too high may indicate stockouts. Compare to industry benchmarks and your historical performance.
What is Days Sales of Inventory?
DSI measures how many days it takes to sell average inventory. It's calculated as 365 divided by inventory turnover ratio. Lower DSI indicates faster inventory conversion to cash. DSI of 60 means inventory sells every 2 months on average.
How do I calculate average inventory?
Average inventory = (Beginning Inventory + Ending Inventory) / 2. Use beginning and ending values for the same period. For more accuracy, use monthly averages if data is available.
Is high inventory turnover always good?
Not necessarily. Very high turnover may indicate stockouts and lost sales. The optimal balance maximizes sales while minimizing holding costs. Monitor stockout rates alongside turnover to ensure adequate availability.
How can I improve inventory turnover?
Improve demand forecasting, implement just-in-time ordering, discount slow-moving items, bundle products, discontinue dead stock, negotiate faster supplier deliveries, and use inventory management software for real-time tracking.
What causes low inventory turnover?
Common causes include overstocking, poor demand forecasting, slow-moving products, seasonal inventory buildup, ineffective marketing, and pricing issues. Low turnover ties up cash and increases holding costs including storage, insurance, and obsolescence risk.