Managers count the number of individual items in each completed sale and average the results. That average is basket size. It measures how many products a typical customer takes to the register.

Larger basket sizes usually mean higher revenue per visit. Stores influence the number through store layout, cross-merchandising, and promotions that encourage additional purchases. Online retailers watch the same metric, tracking how many products end up in the digital cart before checkout.

Basket size varies by store format and trip type. A convenience-store visit produces a small basket; a weekly grocery run produces a large one. Tracking changes over time reveals whether merchandising efforts are working or whether customers are becoming more selective. Combined with average transaction value, basket size gives a clear picture of selling performance.

• Average number of items per customer transaction
• Indicator of merchandising and upselling success
• Varies by store type and shopping mission
• Tracked in both physical and online retail