The Cargo Securing (CS) number is a widely accepted metric used by ship‑owners and cargo planners to verify that a cargo load is adequately restrained against ship motions. It combines the physical characteristics of the cargo with the strength of the securing system, providing a single figure that can be compared against regulatory limits.
A higher CS number indicates a more robust securing arrangement. The calculation takes into account the cargo weight, the securing coefficient (which reflects cargo shape and centre‑of‑gravity considerations), the number of lashings applied, and the tensile capacity of each lashing. By adjusting any of these variables, operators can optimise the balance between safety and operational efficiency.
The CS number is especially important for bulk and heavy cargoes where shifting can cause severe stability problems. Using the CS number early in the loading plan helps to identify potential deficiencies and allows corrective actions—such as adding more lashings or selecting stronger materials—before the vessel departs.
What is the Cargo Securing (CS) number?
How do I calculate the CS number?
Why is a higher CS number better?
What does the securing coefficient represent?
Can I use this calculator for any type of cargo?
What are the regulatory limits for CS numbers?
How often should I recalculate the CS number?
Results are for informational purposes only and do not constitute professional advice.