A twenty-foot equivalent unit (TEU) is a standard measure used in ocean shipping to describe container capacity. One TEU equals the space of a single 20-foot intermodal container, so it helps shippers, carriers, and terminals compare cargo volumes even when containers are different sizes.
How TEU Is Used
TEU is a measuring unit, not a physical container type. A 40-foot container is typically counted as 2 TEU, while smaller equipment or mixed container fleets may be reported in TEU to show overall vessel, port, or terminal capacity. In practice, this makes it easier to plan stowage, track throughput, and estimate how much ocean space a shipment or trade lane may require.
For importers and exporters, TEU appears in booking discussions, capacity reports, and supply chain planning, especially when comparing full container loads across carriers or routes. It does not by itself determine freight charges, customs treatment, or cargo weight limits, which can vary by carrier, equipment, port, and contract. For example, one 20-foot refrigerated container counts as 1 TEU even though its handling needs may be very different from a dry box of the same size.