Inventory Turnover

Inventory Turnover Definition

Inventory turnover is a ratio that measures how many times a business sells and replaces its inventory during a period. The formula is: Cost of Goods Sold ÷ Average Inventory. A higher turnover means inventory is selling quickly. A lower turnover suggests slow-moving stock that may be tying up cash.

Inventory Turnover in Practice — Example

A craft supply store has $180,000 in annual COGS. Beginning inventory was $40,000 and ending inventory was $50,000, so average inventory is $45,000. Inventory turnover is $180,000 ÷ $45,000 = 4 times per year. That means the store sells through and replaces its entire inventory about every 3 months. If turnover drops to 2, inventory is sitting twice as long—a signal to investigate slow sellers.

Why Inventory Turnover Matters for Your Books

Inventory turnover is one of the most actionable metrics for product-based businesses. It connects your bookkeeping data directly to operational decisions about purchasing, pricing, and product mix.

High turnover generally means you're managing inventory efficiently—products sell quickly, cash cycles are short, and storage costs stay low. But extremely high turnover could mean you're frequently out of stock, losing sales to competitors.

Low turnover means cash is trapped in unsold products. Slow-moving inventory also increases the risk of obsolescence, spoilage, and markdowns. If your books show $100,000 in inventory but half of it hasn't moved in six months, that $50,000 isn't really an asset—it's a liability in disguise.

How Inventory Turnover Shows Up in QuickBooks

QBO doesn't calculate inventory turnover as a built-in metric, but you can derive it easily. Pull COGS from the Profit & Loss report and average inventory from the Inventory Valuation Summary (run it at period start and end, then average). For a quick view, the Inventory Valuation Summary shows quantity on hand and value for each product, helping you spot slow movers. Third-party apps like SOS Inventory or inFlow integrate with QBO and provide automated turnover reporting.

Common Mistakes

Not calculating turnover by product category: Overall turnover can mask problems. Your best-sellers may turn 12 times a year while your worst turn once. Analyze at the product or category level.

Using revenue instead of COGS in the formula: Inventory turnover should use COGS (cost-based), not revenue (selling price). Using revenue inflates the ratio and makes turnover look better than it is.

Ignoring seasonal patterns: A ski shop will have wildly different turnover rates by season. Compare turnover to the same period last year, not to the previous month.

FAQ

Q: What's a good inventory turnover ratio?

A: It varies by industry. Grocery stores might see 12-15x. Retail clothing runs 4-6x. Furniture stores might be 2-4x. Compare to your industry average rather than a universal benchmark.

Q: How do I improve inventory turnover?

A: Reduce slow-moving stock (discounts, bundles), improve demand forecasting, negotiate smaller and more frequent supplier orders, and discontinue products that consistently underperform.

Related Terms

Inventory

Cost of Goods Sold

FIFO

Working Capital

Liquidity

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