What is the difference between TON and TEU calculations?
The OOCL CO2 Index indicates the average carbon dioxide (CO2) emitted per operating unit measured in kg CO2/TEU-km or kg CO2/TON-km. For vessels, indices are calculated using actual fuel consumption, actual distance sailed and nominal vessel cargo capacity. Cargo capacity is represented by two different unit systems, TEU (Twenty-foot Equivalent Unit) and TON (cargo weight), thus translating to two options for users to calculate emissions.