Last updated: May 2026
Quick Answer
Inventory turnover ratio measures how many times your inventory is sold and replaced during a given period. A ratio of 4-6x per year is healthy for most retail industries, meaning stock turns over every 2-3 months. Higher turnover indicates efficient cash management and strong sales.
Key Takeaways
- ✓ Inventory Turnover = COGS ÷ Average Inventory
- ✓ Average Inventory = (Beginning Inventory + Ending Inventory) ÷ 2
- ✓ Days Sales of Inventory (DSI) = 365 ÷ Turnover Ratio
- ✓ Higher turnover means inventory sells faster, so your cash isn't tied up in the warehouse.
- ✓ An extremely high turnover ratio can actually be bad if it leads to frequent stockouts.
What Is Inventory Turnover and Why Does It Matter?
Inventory turnover is an efficiency ratio that shows how effectively inventory is managed by comparing cost of goods sold (COGS) with average inventory for a period. It indicates how many times a company's inventory is sold and replaced over a year.
This metric is critical because inventory ties up cash. If you buy $100,000 worth of stock that sits in a warehouse for a year, that is $100,000 you cannot spend on marketing, hiring, or expansion. High turnover indicates strong sales and efficient management. Low turnover suggests overstocking, obsolescence, or weak demand.
How to Calculate Inventory Turnover
There are two steps to calculating your inventory turnover ratio:
- Find your Average Inventory: Add your beginning inventory to your ending inventory for the period (e.g., a year) and divide by two. This smooths out seasonal spikes.
- Divide COGS by Average Inventory: Take your total Cost of Goods Sold for the period and divide it by the average inventory figure.
Example: A retailer has $500,000 in COGS for the year. Their starting inventory was $120,000 and their ending inventory was $80,000. Their average inventory is $100,000. Their turnover ratio is $500,000 ÷ $100,000 = 5.0x. This means they sold through their entire inventory 5 times over the year (or roughly every 73 days).
Inventory Turnover Benchmarks by Industry
There is no universal "good" turnover ratio. A grocery store dealing with perishable goods needs a much higher turnover than a luxury jeweler.
| Industry | Typical Turnover Ratio | Days to Sell (DSI) |
|---|---|---|
| Grocery & Supermarkets | 14.0x – 20.0x | 18 – 26 days |
| Consumer Electronics | 8.0x – 12.0x | 30 – 45 days |
| Apparel & Fast Fashion | 4.0x – 6.0x | 60 – 90 days |
| Furniture & Home Goods | 3.0x – 4.0x | 90 – 120 days |
| Luxury Goods & Jewelry | 1.0x – 2.0x | 180 – 365 days |
5 Ways to Improve Your Inventory Turnover
If your turnover is too low (i.e., your cash is trapped in unsold goods), consider these strategies:
- Improve Demand Forecasting: Use historical sales data and seasonal trends to order exactly what you need, rather than relying on gut feelings.
- Liquidate Slow-Moving Stock: Stale inventory costs money to store. Run clearance sales, bundle dead stock with high-velocity items, or sell to discount liquidators to free up cash.
- Order Smaller Quantities More Frequently: Move to a "just-in-time" (JIT) inventory model to reduce the amount of stock you carry at any given moment.
- Negotiate Shorter Supplier Lead Times: If your suppliers can deliver faster, you don't need to hold as much "safety stock" in your warehouse.
- Optimize Your Product Mix: Identify the 20% of products that generate 80% of your sales (the Pareto principle) and allocate more capital to those high-velocity items while cutting the underperformers.
The Hidden Risk of Very High Turnover
While high turnover is generally good, pushing the ratio too high can be dangerous. If your turnover ratio is significantly above your industry average, it may indicate that you are understocking. This leads to frequent stockouts (running out of inventory), which results in lost sales, frustrated customers, and expensive rush-shipping fees from your suppliers.
Frequently Asked Questions
What is a good inventory turnover ratio?
It varies heavily by industry. Grocery stores may have 14-20x, while furniture stores average 3-4x. Generally, a higher ratio is better as it means less capital is tied up in unsold goods.
How do I calculate Average Inventory?
Add your Beginning Inventory and your Ending Inventory for the period, then divide by two. This smooths out seasonal inventory spikes.
Can an inventory turnover ratio be too high?
Yes. An extremely high turnover ratio often means you are understocking products. This leads to frequent stockouts, lost sales, and frustrated customers.
What is the difference between Inventory Turnover and Days Sales of Inventory (DSI)?
Inventory Turnover measures how many times you sell out your stock in a year (e.g., 5 times). DSI measures how many days it takes to sell that stock (e.g., 73 days). They are inverses of each other.
How do I improve my inventory turnover?
You can improve it by increasing sales (via marketing or discounting) or by decreasing average inventory (via better demand forecasting, liquidating dead stock, or ordering smaller quantities more frequently).