Sell-Through Rate

Sell-through rate is the percentage of available inventory sold over a given period, used to measure product performance and inform future purchasing decisions. It is calculated by dividing the number of units sold by the number of units received or available, then multiplying by 100. This metric helps retailers understand how quickly inventory moves and whether purchasing levels align with actual customer demand.

Why it matters for e-commerce brands

For Shopify and DTC merchants, sell-through rate is critical for optimizing cash flow and avoiding costly inventory issues. A low sell-through rate indicates slow-moving stock that ties up capital and may require markdowns, while a high rate suggests strong demand and potential stockout risks. By monitoring sell-through rates across products, collections, and seasons, e-commerce brands can make data-driven decisions about reordering, discontinuing items, and allocating marketing spend to maximize profitability.

Example

A Shopify apparel brand receives 500 units of a new jacket style at the beginning of October. By the end of the month, they've sold 350 units. Their monthly sell-through rate is 70% (350 ÷ 500 × 100). This strong performance indicates the product is resonating with customers, so the brand decides to reorder before inventory runs out. In contrast, another style with only a 25% sell-through rate after the same period signals weak demand, prompting the brand to reduce future orders and consider promotional pricing to clear remaining stock.

Related terms

• Inventory Turnover
• Days Sales of Inventory (DSI)
• Stock-to-Sales Ratio
• Weeks of Supply
• Inventory Velocity