Cargo Securing & Lashing MSL Calculator | ShipUniverse
CSS Code Annex 13 • MSL / MBL • Calculated Strength • Friction • Sliding • Tipping • CSM • 2026 PSC Cargo Securing CIC

Cargo Securing & Lashing MSL Calculator

Screen non-standardized cargo securing from certified lashing strength through sliding and tipping resistance. Convert breaking strength to MSL where permitted, apply the Annex 13 calculated-strength safety factor, resolve lashing geometry, compare port/starboard and fore/aft capacity, and identify the equipment, documentation or heavy-weather gaps that should be closed before sailing.

Paris / Tokyo MoU Cargo Securing CIC active 1 September to 30 November 2026
Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Cargo Unit & Voyage Basis

Use the approved Cargo Securing Manual, class-approved loading information, certified securing gear and the vessel's actual voyage design basis. This tool does not create approved acceleration values.

tonnes.
m, used for longitudinal tipping screen.
m, used for transverse tipping screen.
m.
Annex mode excludes transverse lashings with more than 30° horizontal deviation from the transverse direction.

Design Forces & Friction

g. Replace example with ship-specific CSM / approved lashing basis.
g.
g, used to reduce effective normal force in the sliding/tipping screen.
kN, used only in direct-force mode.
kN, used only in direct-force mode.
kN, used only in direct-force mode.
kN.
kN.
Use verified material/contact condition. Snow, ice, oil, scale and water can materially reduce friction.

Transverse Lashing Group

Enter the number of equivalent lashings on each side of the cargo. For a series of components, the weakest applicable MSL governs.

kN. Used only where a certified/marked MSL is not entered.
kN. Enter 0 to derive from MBL using CSS Annex 13 table.
kN. Enter 0 if not separately limiting.
kN.
degrees from horizontal deck plane.
degrees from the transverse direction.
% screening derate for known equipment/installation condition. This is not an IMO substitute for removing defective gear.
m. Use the actual geometry from the CSM / securing sketch.

Longitudinal Lashing Group

degrees from horizontal.
m, engineering screen.

Advanced Lashing Register

Enter each lashing group separately. Quantity is the number in that specific load-resisting set. "Both sides" means the entered quantity exists on each side; "both ends" means the quantity exists at each end.

GroupResistsQtyDeviceMBL kNMarked MSLEnd fitting MSLDeck MSLα vertβ horizCondition %Lever c mUnit cost

Cargo Securing Manual & PSC Readiness

The 2026 Paris/Tokyo MoU CIC is checking implementation of current SOLAS cargo securing requirements. The questionnaire does not replace the CSM or prove that a lashing arrangement satisfies its design parameters.

Additional Securing / Rework Scenario

kN.
0 = derive from MBL.
degrees.
% used only to illustrate the scale of securing risk versus corrective work.
Engineering limitation: A green screen does not authorize cargo carriage. The ship's approved Cargo Securing Manual, approved lashing software where applicable, class/flag requirements, certified MSL/SWL markings, actual deck/fitting strength, cargo-specific sea-fastening design, voyage weather criteria and the Master's judgment control. The CSS Annex 13 acceleration tables and correction factors are ship/stow specific; this calculator therefore requires approved acceleration factors or approved design forces rather than inventing universal values.
Regulatory / technical basis: SOLAS chapters VI and VII cargo stowage and securing requirements; IMO Code of Safe Practice for Cargo Stowage and Securing (CSS Code), current 2021 Edition and Annex 13 amendments including MSC.1/Circ.1623; MSC.1/Circ.1353/Rev.2 Revised guidelines for the preparation of the Cargo Securing Manual. Annex 13 defines MSL as the securing-device load capacity, requires the weakest MSL in a series to govern, and uses CS = MSL / 1.5 for calculated balance methods. The current CSM guidelines remain under IMO revision for lashing-software performance standards as of 3 September 2026. Paris and Tokyo MoU Cargo Securing CIC: 1 September to 30 November 2026.
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