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Inventory Turnover Calculator

Measure how efficiently your business moves inventory and identify tied-up cash.

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What Is Inventory Turnover?

Inventory turnover measures how many times a business sells and replaces its inventory within a given period, typically one year. The formula is: Turnover Ratio = Cost of Goods Sold / Average Inventory. A higher ratio means you are selling through inventory quickly, which is generally healthy. A low ratio suggests overstocking, slow-moving products, or declining demand. The companion metric, Days Sales of Inventory (DSI), converts the ratio into something more intuitive: the average number of days it takes to sell through your inventory. DSI = 365 / Turnover Ratio. If your turnover ratio is 5, your DSI is 73 days -- meaning your average item sits on shelves or in a warehouse for about 2.5 months before being sold. Inventory is cash tied up in physical form. Every dollar sitting in unsold inventory is a dollar that cannot be used to pay bills, invest in marketing, hire staff, or earn interest. Companies with poor inventory management often face cash flow crises despite appearing profitable on paper. This is why Amazon, Walmart, and other supply chain leaders obsess over inventory turnover -- it is the difference between thriving and running out of cash.

How to Use This Calculator

Enter Cost of Goods Sold

Use your annual COGS from your income statement, not revenue. COGS represents the actual cost of the inventory you sold, which is the correct denominator for this calculation.

Calculate Average Inventory

Average inventory = (Beginning Inventory + Ending Inventory) / 2. Use the inventory values from your balance sheet at the start and end of the period. For more accuracy, average all 12 monthly inventory figures.

Interpret the Results

Compare your turnover ratio to industry benchmarks. Grocery: 14-20. Retail: 4-8. Manufacturing: 4-6. Luxury goods: 1-3. The goal is not the highest possible number -- too high can mean you are constantly running out of stock and losing sales.

Key Concepts

Turnover Ratio

COGS divided by average inventory. A ratio of 5 means you sell through your entire inventory 5 times per year. Higher is typically better, but context matters by industry.

Days Sales of Inventory (DSI)

365 divided by turnover ratio. Shows how many days the average item sits before being sold. A DSI of 30 is fast-moving; 180 suggests serious overstocking or demand problems.

Carrying Cost

The annual cost of holding inventory, typically 20-30% of inventory value. Includes warehousing, insurance, obsolescence, damage, and opportunity cost of tied-up capital.

Dead Stock

Inventory that has not sold in 12+ months. Dead stock ties up cash and warehouse space. Industry best practice: liquidate dead stock at a loss rather than paying to store it indefinitely.

Stockout Cost

The revenue and customer goodwill lost when items are out of stock. Retail studies show 31% of customers buy from a competitor when their preferred item is unavailable.

Expert Insights

The Carrying Cost Trap: Most businesses underestimate inventory carrying costs. The true annual cost of holding inventory is 20-30% of its value when you account for warehouse space, insurance, shrinkage (theft/damage), obsolescence, and the opportunity cost of capital. On $100,000 of average inventory, you are spending $20,000-$30,000 per year just to store it. This is why lean inventory management has such a massive impact on profitability.

Segmented Analysis: Do not calculate one turnover number for your entire inventory. Segment by product category, SKU, or supplier. You may find that 20% of your SKUs account for 80% of sales (the Pareto principle in action), while the bottom 20% have turnover ratios below 1 and should be discontinued or heavily discounted. ABC analysis (A = top 20% of SKUs, B = middle 30%, C = bottom 50%) is the standard framework.

Frequently Asked Questions

It varies dramatically by industry. Grocery stores: 14-20 (perishables move fast). Fashion retail: 4-6 (seasonal). Furniture: 5-8. Electronics: 6-10. Luxury goods: 1-3. Industrial manufacturing: 4-6. Compare against your specific industry, not a generic number.

Yes. Extremely high turnover may indicate you are not keeping enough stock, leading to frequent stockouts, lost sales, and unhappy customers. It can also mean you are ordering too frequently, increasing shipping costs and admin overhead. The goal is optimal turnover -- fast enough to avoid excess carrying costs, slow enough to maintain product availability.

Five strategies: 1) Discount slow-moving items to clear them. 2) Reduce order quantities to better match demand. 3) Negotiate shorter lead times with suppliers so you can order more frequently in smaller batches. 4) Discontinue SKUs that consistently underperform. 5) Improve demand forecasting using historical sales data and seasonality patterns.

Always use COGS, not revenue. Inventory on the balance sheet is valued at cost, so the numerator should also be at cost for an accurate ratio. Using revenue inflates the ratio and masks true inventory efficiency. Some financial reports use revenue for simplicity, but this creates comparability issues.

This calculator provides estimates for educational purposes only. Actual results depend on your specific business circumstances, market conditions, and accounting methods. Consult a qualified CPA or business advisor before making major financial decisions.