Inventory turnover ratio measures how many times a business sells and replaces inventory during a period. It is one of the clearest signals of whether stock is moving efficiently.
What is inventory turnover ratio?
Inventory turnover ratio compares cost of goods sold to average inventory. A higher number usually means stock sells through quickly. A lower number can point to overstocking, slow-moving items, or weak demand.
The right turnover depends on the industry. Grocery and consumables turn faster than equipment, furniture, or specialty parts.
The formula: COGS divided by average inventory
Inventory turnover = Cost of Goods Sold / Average Inventory. Average inventory is usually beginning inventory plus ending inventory, divided by two.
For example, if annual COGS is $500,000 and average inventory is $100,000, turnover is 5. That means the business sold through inventory about five times during the year.
What is a good inventory turnover ratio?
There is no universal target. As a rough rule, a turnover between 5 and 10 is healthy for many businesses — it means you sell and replace stock roughly every one to two months. But the right number depends heavily on your industry, margin model, and supplier lead times, so benchmark against your own category rather than a single figure.
Typical industry ranges give you a starting point: grocery and fast-moving consumables often run 12 to 14; general retail lands around 8 to 10; automotive parts sit near 6 to 8; manufacturing commonly runs 4 to 7; furniture is closer to 3 to 4; healthcare and pharmaceuticals fall around 3 to 5; and luxury or specialty goods can be as low as 1 to 2, which is normal for high-value, low-volume items.
A high turnover is usually efficient, but too high can signal that you are understocking and losing sales to stockouts, or reordering so often that you never capture volume discounts. Read a low ratio as excess or dead stock, and a very high ratio as a demand-planning risk — both are worth investigating.
• Grocery / consumables: ~12–14
• General retail: ~8–10
• Automotive parts: ~6–8
• Manufacturing: ~4–7
• Furniture: ~3–4
• Healthcare / pharma: ~3–5
• Luxury / specialty: ~1–2
Turn the ratio into days: days sales of inventory
Turnover tells you how many times you cycle stock in a period; days sales of inventory (DSI) tells you the same thing in days, which is often easier to act on. The formula is DSI = 365 / inventory turnover ratio.
If your turnover is 5, your DSI is about 73 days — on average, an item sits in stock for roughly two and a half months before it sells. Convert your ratio to days whenever you are setting reorder points or judging whether a product line is moving fast enough to justify its shelf space.
How to improve inventory turnover
Improving turnover usually means reducing excess inventory while protecting availability for important items. Start by identifying slow movers, dead stock, and items that repeatedly stock out.
• Set reorder points based on real usage and lead time.
• Run cycle counts on high-value and fast-moving items.
• Clear dead stock with discounts, bundles, or returns.
• Shorten supplier lead times where possible.
• Use low-stock alerts instead of buying large safety buffers.
How StockZip helps track turnover inputs
StockZip keeps item movement, quantities, receiving, and stock adjustments in one place. That makes it easier to trust the inputs behind turnover analysis instead of relying on stale spreadsheets.
What is the inventory turnover formula?
Inventory turnover = Cost of Goods Sold / Average Inventory.
Is high inventory turnover always good?
Not always. High turnover is usually efficient, but if it is too high you may be understocked and losing sales or delaying work.
How often should I calculate inventory turnover?
Monthly or quarterly is useful for operations. Annual turnover is helpful for financial comparison but too slow for day-to-day decisions.
How do I improve a low turnover ratio?
Reduce slow-moving stock, improve purchasing discipline, set reorder points, and use cycle counts to keep stock data accurate.
What is a good inventory turnover ratio by industry?
It varies widely: grocery and consumables often run 12–14, general retail 8–10, automotive parts 6–8, manufacturing 4–7, furniture 3–4, healthcare 3–5, and luxury goods 1–2. For many businesses a ratio of 5–10 is healthy.
How do I convert inventory turnover into days?
Use days sales of inventory: DSI = 365 / turnover ratio. A turnover of 5 is about 73 days, meaning stock sits roughly two and a half months on average before it sells.