Inventory Turnover

Inventory turnover is a ratio that measures how many times a company sells and replaces its entire inventory within a given period, typically a year. This metric is calculated by dividing the cost of goods sold (COGS) by the average inventory value during that period. A higher inventory turnover rate generally indicates strong sales performance and efficient inventory management, while a lower rate may suggest overstocking or weak demand.

Why it matters for e-commerce brands

For Shopify and DTC merchants, inventory turnover directly impacts cash flow and profitability. Fast-moving inventory means capital isn't tied up in unsold products, reducing storage costs and the risk of deadstock from seasonal items or trend changes. Understanding turnover rates helps e-commerce brands optimize reorder quantities, identify bestsellers versus slow movers, and make informed decisions about promotions or markdowns to maintain healthy inventory levels.

Example

A Shopify apparel brand has $150,000 in cost of goods sold for the year and maintains an average inventory value of $30,000. Their inventory turnover ratio is 5 ($150,000 ÷ $30,000), meaning they completely sold and replaced their inventory five times during the year, or roughly every 73 days. If a competitor in the same niche only achieves a turnover of 3, this brand is moving product more efficiently, freeing up cash faster to invest in new styles or marketing campaigns.

Related terms

• Days Sales of Inventory (DSI)
• Stock-to-Sales Ratio
• Deadstock
• Cost of Goods Sold (COGS)
• Carrying Costs