Stockout

A stockout is a situation in which a product is completely out of stock and unavailable to fulfill customer orders, resulting in lost revenue and customer dissatisfaction. This occurs when inventory levels reach zero before replenishment stock arrives, leaving retailers unable to meet demand. Stockouts can happen due to various factors including inaccurate demand forecasting, supply chain disruptions, supplier delays, or inadequate safety stock levels.

Why it matters for e-commerce brands

For Shopify and DTC merchants, stockouts directly impact revenue and customer loyalty in a highly competitive market. When a product shows as out of stock, customers often immediately turn to competitors who can fulfill their order, resulting in permanent customer loss rather than just delayed sales. Additionally, stockouts can damage a brand's reputation on social media and review platforms, where disappointed customers quickly share negative experiences, making it harder to acquire new customers and retain existing ones.

Example

A Shopify-based activewear brand launches a viral TikTok campaign for a new legging design, generating 500 orders in 24 hours. However, the brand only had 200 units in stock and their supplier needs three weeks to manufacture more. The remaining 300 customers receive out-of-stock notifications, and analytics show that 60% of them immediately purchased from a competitor instead of waiting. The brand loses approximately $15,000 in immediate revenue and misses the peak of the viral trend, unable to capitalize on the marketing momentum when restocked three weeks later.

Related terms

• Safety stock
• Backorder
• Reorder point
• Inventory turnover
• Lead time