Out-of-Stock (OOS) Rate

The share of time or locations where a product is unavailable to buy, which wastes ad spend and hurts organic ranking.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

Out-of-stock (OOS) rate is the share of time or locations in which a product is unavailable to buy. It is tracked online and in physical stores. High OOS rates lose sales to competitors, waste retail media spend directed at unavailable listings, and can weaken a product's organic ranking on marketplaces that reward consistent sales.