Stowage Factor Checker

It is a fraction (or, in some references, expressed as volume per unit weight) describing how efficiently cargo fills the space it is loaded into. In this calculator it is expressed as a fraction of perfect stowage, so 1.0 means the cargo packs with no wasted space and anything below 1.0 means some volume is lost to gaps, irregular shapes, or packing constraints.

It commonly falls in the 10-25% range depending on cargo type — uniform cartons on pallets tend toward the lower end, while irregular shapes, machinery, or mixed-size loads push toward the higher end. There is no single figure that applies across all cargo, so confirm the assumption your forwarder is using rather than defaulting to one number.

LCL freight is priced on the space your cargo actually occupies in a shared container, not just its theoretical CBM. If broken stowage means your shipment effectively takes up more room than its raw measurement suggests, the forwarder is losing sellable space to that gap, so rates are typically built around effective (stowed) volume rather than actual volume alone.

Density is a property of the cargo itself — its weight per unit volume, independent of how it is packed. Stowage factor describes packing efficiency — how much of the available space the cargo actually fills once loaded, which depends on shape, packaging, and loading method as much as the cargo's own density. Two shipments with identical density can have very different stowage factors depending on how regular or awkward their shapes are.

Irregular or protruding shapes that cannot be tightly stacked, oversized or undersized packaging relative to the container or trailer's dimensions, required dunnage and bracing for fragile or hazardous cargo, and mixing pallet sizes within the same load are the usual culprits. Standardizing carton or pallet dimensions ahead of booking is the most reliable way to push the stowage factor closer to 1.0.