A statistical unit based on a 20-foot long ISO container (6.10 m) to provide a standardized measure of containers of various capacities and for describing the capacity of container transport carrier or terminals. Examples:
- One 20-foot long ISO container equals 1 TEU;
- One 40-foot long ISO container equals 2 TEU;
- One container between 20 and 40-foot long equals 1.50 TEU;
- One container of more than 40-foot long equals 2.25 TEU.