The Forty-Foot Equivalent Unit (FEU), also known as the Forty-Foot Container Equivalent Unit (FFE), is a standard unit of measurement used in the shipping and logistics industry to quantify the size and capacity of cargo containers. Specifically related to a 40-foot shipping container, the FEU serves as a universal measurement for comparing container capacity and estimating cargo volume. It simplifies calculations for container requirements, transportation costs and cargo management, and provides a standardised reference point for containerised shipping worldwide.