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EfficiencyIT

What is Inventory Turnover?

Inventory Turnover measures how many times a company sells and replaces its inventory in a year. Higher turnover generally indicates efficient inventory management and strong demand. Very low turnover may signal obsolete inventory or weak sales. As one component of the cash conversion cycle, inventory turnover directly affects working capital requirements and free cash flow generation.

Formula

Inventory Turnover = COGS / Average Inventory

Inventory Turnover and the Cash Conversion Cycle

Inventory turnover is most powerful when analyzed as part of the cash conversion cycle (CCC). The CCC measures how long cash is tied up from the moment it is spent on inventory to when it is recovered through customer payment. Companies like Costco achieve negative cash conversion cycles: they collect from customers (in cash) before they have to pay their suppliers, effectively using suppliers as a source of interest-free financing.

When comparing inventory turnover across time, watch for accelerating turns accompanied by shrinking gross margins -- it can indicate the company is discounting aggressively to clear excess inventory rather than genuinely improving operational efficiency. Context from the management discussion and analysis (MD&A) section of earnings filings is essential for interpreting unusual changes.

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Inventory turnover directly affects working capital and free cash flow. Use our DCF Calculator to model how changes in inventory efficiency flow through to valuation.

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Frequently Asked Questions

What is inventory turnover and why does it matter?+
Inventory Turnover = COGS / Average Inventory (where Average Inventory = (beginning inventory + ending inventory) / 2). It tells you how many times a company sold its entire inventory stock during the year. If a company has $100M in average inventory and $500M in COGS, its inventory turnover is 5x -- meaning it cycles through its inventory five times per year, or roughly every 73 days. It matters because inventory is a working capital cost: the longer goods sit unsold, the more cash is tied up, and the higher the risk of obsolescence, spoilage, or price decline.
What is a good inventory turnover ratio?+
Inventory turnover benchmarks are highly industry-specific. Grocery and supermarket chains typically turn inventory 20-30x per year because food is perishable and demand is constant. Fast-moving consumer goods companies turn 8-15x. Automotive manufacturers and dealers average 5-10x. Industrial and heavy equipment companies may turn 3-6x. Luxury goods, fine wines, and high-end furniture often turn 1-3x, which is acceptable given price point and deliberate scarcity positioning. The key comparison is always against industry peers, not absolute levels.
Can inventory turnover be too high?+
Yes -- extremely high inventory turnover in manufacturing or retail can signal stockouts: the company is selling faster than it can restock, leading to lost sales and customer dissatisfaction. A just-in-time supply chain with no buffer inventory is highly efficient but also highly fragile to supply disruptions, as vividly demonstrated during the 2020-2021 global supply chain crisis. The optimal level balances carrying costs (too much inventory) against stockout risk (too little). Investors should compare turnover to supply chain commentary in earnings calls for context.
What is the relationship between inventory turnover and Days Inventory Outstanding?+
Days Inventory Outstanding (DIO) = 365 / Inventory Turnover. They are reciprocals measuring the same thing in different units: turnover rate per year versus average days to sell inventory. A turnover of 5x equals a DIO of 73 days. DIO is part of the cash conversion cycle (CCC = DIO + DSO - DPO). A lower DIO means the company converts inventory to cash faster, reducing working capital needs and improving free cash flow. When comparing peers, DIO is often more intuitive: "this retailer holds 25 days of inventory while its competitor holds 45 days" is immediately actionable.

Related Terms

Days Sales Outstanding

Average days to collect payment after a sale

Working Capital

Current assets minus current liabilities

Gross Profit Margin

Revenue retained after direct production costs

Asset Turnover

Revenue generated per dollar of total assets

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