Lashing Design App (IMO CSS)

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Spreadsheet for Lashing calculation as per IMO CSS


This Excel app helps you to calculate the external forces acting on a cargo unit in longitudinal, transverse and vertical directions during sea transportation.
Furthermore, the app calculates the restraint provided by soft lashing in different directions and assists you in calculating the required minimum lashing in order to secure the cargo for sea passage.


Version without Stoppers – if there are no stoppers deployed

Version with Stoppers – if there are Stoppers deployed additionally

How to use?

The user is asked to provide input sucha as Ship’s particulars, cargo weight, stowage position, COG, information for the lashing etc.
The Input cells are highlighted in blue or yellow.
Additional information and guidelines for the different input required can be found in the guide sheet.


The acceleration figures shown in table 3 and table 4 in annex 13 are basis for the calculation of accelerations and apply in principle to ships with 50 m ≤ L ≤ 200 m, 9 kn ≤ V ≤ 24 kn and B/GM ≥ 7. The formula for length/speed correction factor shall not be used for ships lengths less than 50m or more than 300m


1. IMO Code of safe practice for cargo stowage and securing 2011 Edition
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Additional information

License Type


With/Without Stopper

With Stopper, Without Stopper

1 review for Lashing Design App (IMO CSS)

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  1. Prashob Nair (verified owner)

    Product satisfactory. Scope for improvement on the interface

    • Team TheNavalArch (store manager)

      Thanks for the feedback. We will work on improving the interface for the next version

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