Calculate your inventory turnover ratio and days to sell inventory. Enter COGS and average inventory value to benchmark performance.
Inventory turnover measures how many times a business sells and replaces its stock during a given period. A higher ratio indicates strong sales and efficient inventory management, while a lower ratio may signal overstocking or weak demand.
For e-commerce sellers, tracking inventory turnover is critical because holding unsold stock ties up cash and incurs storage fees. The ideal turnover rate varies by category — perishable goods might turn 20–50 times per year, while durable goods may only turn 4–8 times.
This calculator computes your turnover ratio from Cost of Goods Sold (COGS) and average inventory value, then converts it to days of inventory. Use the results to identify slow-moving SKUs, optimize purchasing, and free up working capital for growth. Whether you are a beginner or experienced professional, this free online tool provides instant, reliable results without manual computation. By automating the calculation, you save time and reduce the risk of costly errors in your planning and decision-making process.
Understanding your inventory turnover helps you make smarter purchasing decisions, reduce storage costs, and improve cash flow. This calculator benchmarks your turnover against industry standards so you can quickly identify whether your inventory management needs improvement. Having a precise figure at your fingertips empowers better planning and more confident decisions.
Inventory Turnover = COGS / Average Inventory Value Days of Inventory (DOI) = 365 / Inventory Turnover Average Inventory = (Beginning Inventory + Ending Inventory) / 2
Result: Turnover: 6.67× | Days of Inventory: 54.7 days
With $500,000 in COGS and $75,000 average inventory: Turnover = 500,000 / 75,000 = 6.67 times per year. Days of Inventory = 365 / 6.67 = 54.7 days. This falls within the healthy benchmark range of 4–12 turns annually.
E-commerce inventory turnover varies significantly by category. Apparel and fashion typically see 4–6 turns, electronics 6–8, health and beauty 8–12, and grocery or perishable items can exceed 20. Knowing your category benchmark helps you set realistic targets.
To boost inventory turnover, focus on demand forecasting accuracy, reduce lead times, implement just-in-time ordering, and regularly review your product catalog for slow movers. Consider dropshipping for long-tail items and keep warehouse stock focused on proven bestsellers.
Many e-commerce businesses see dramatic turnover changes during peak seasons. Calculate turnover for each quarter separately to understand your seasonal pattern. Build inventory before peak periods and aggressively clear stock afterward to maintain healthy annual averages.
Most e-commerce businesses target a turnover ratio between 4 and 12 times per year. Fast-moving consumer goods may exceed 12, while specialty or high-value items might be lower. The key is comparing against your specific product category benchmarks.
COGS is the standard and preferred metric because it matches the cost basis of your inventory valuation. Using revenue inflates the ratio by including your markup, making comparisons across businesses less meaningful.
Add your beginning inventory value to your ending inventory value and divide by 2. For more accuracy, sum monthly ending values and divide by 12. This smooths out seasonal fluctuations.
Low turnover typically results from overstocking, poor demand forecasting, too many slow-moving SKUs, or declining market demand. It can also occur when purchasing in large quantities to get volume discounts without sufficient demand to justify the investment.
Higher turnover means you convert inventory into revenue faster, freeing up cash for reinvestment. Low turnover ties up capital in unsold stock, increases storage costs, and can lead to markdowns or write-offs that erode profitability.
Yes. Extremely high turnover may indicate you're not keeping enough stock, leading to stockouts, lost sales, and poor customer experience. Balance efficiency with availability by maintaining appropriate safety stock levels.