Inventory Turnover Calculator – Stock Efficiency
Calculate inventory turnover ratio and days sales of inventory (DSI).
About This Calculator
Calculate inventory turnover ratio and days sales of inventory (DSI). Use the calculator above for instant results.
Worked Examples
- Turnover: 5x/year | DSI: 73 days | Good performance
Answer: 5x / 73 days
- Turnover: 4x | DSI: 91 days
Answer: 4x turnover
- Turnover: 13.3x | DSI: 27 days — lean and efficient
Answer: 13.3x turnover
Who Uses This Calculator?
Monitor inventory efficiency.
Track working capital optimization.
Identify slow-moving inventory.
Assess inventory quality for loans.
Common Mistakes to Avoid
❌ Comparing across industries
Grocery: 12-20x. Retail: 4-8x. Auto: 4-6x. Jewelry: 1-2x. Compare to industry benchmarks, not generic targets.
❌ Using end-period inventory instead of average
Use average inventory (beginning + ending / 2) for a more accurate picture of inventory levels throughout the year.
Frequently Asked Questions
Good inventory turnover?
Depends on industry. Higher = lean (less storage cost, less obsolescence risk). Very low = overstocking or declining sales.
DSI (Days Sales of Inventory)?
365 / turnover ratio. How many days of sales are sitting in inventory. Lower is generally better.
Improve inventory turnover?
Demand forecasting, ABC analysis, reduce reorder points, discount slow-movers, improve supplier lead times.