Twenty-foot equivalent unit

A 20-foot-long (6.1 m) ISO container equals 1 TEU.

Two forty-foot containers stacked on top of two twenty-foot containers. These four containers represent 6 TEU.

The twenty-foot equivalent unit (abbreviated TEU or teu) is a general unit of cargo capacity, often used for container ships and container ports.^[1] It is based on the volume of a 20-foot-long (6.1 m) intermodal container, a standard-sized metal box that can be easily transferred between different modes of transportation, such as ships, trains, and trucks.^[1]