Precision logistics calculator
Stowage Factor Calculator
Calculate cargo stowage factor, bulk density, and optional hold volume or weight constraints.
Schematic planning preview
Method, examples, and limitations
How to use the Stowage Factor Calculator
Stowage factor connects cargo volume and mass. The calculator keeps metric tonnes, long tons, short tons, cubic metres, and cubic feet distinct, then shows the density relationship and an optional hold-fit constraint without presenting a loading approval.
Calculation method
Start with the information you actually know
Choose cargo volume and mass, a known stowage factor, or a measured bulk density. The engine converts each physical input to SI first, so mixed source units can be compared without applying a hidden shortcut.
Metric and imperial definitions
Metric stowage factor equals cubic metres divided by metric tonnes. Density in kilograms per cubic metre is 1,000 divided by that factor. The imperial result uses cubic feet per long ton and does not confuse long tons with short tons.
Optional hold-fit comparison
If you enter hold volume, usable-space efficiency, and an available weight allocation, the calculator reports the volume-limited mass, weight-limited mass, loadable mass, and governing constraint. No universal broken-stowage percentage is inserted.
Worked planning example
A cargo occupying 2,500 m³ at 2,000 metric tonnes has a stowage factor of 1.25 m³/t and a density of 800 kg/m³. A 10,000 m³ hold at 90% usable space is volume-limited to 7,200 t; with a 6,500 t weight allocation, weight governs and loadable mass is 6,500 t.
What this result does not replace
Planning calculation only. This is not a vessel stability, trim, tank-top strength, load-line, structural, or cargo-safety approval.
Review the formula trace and the assumptions returned with each result. Project documents, supplier data, contracts, local rules, and qualified professional review take priority over a generic planning calculation.
Frequently asked questions
What is a stowage factor?
Stowage factor is the volume occupied by one unit of cargo mass, commonly expressed as cubic metres per metric tonne or cubic feet per long ton.
How is stowage factor calculated?
Divide cargo volume by cargo mass after converting both values to a consistent unit system.
How does bulk density relate to stowage factor?
In consistent metric units, density in tonnes per cubic metre is the reciprocal of stowage factor in cubic metres per tonne.
What does the governing constraint mean?
It identifies whether the entered usable hold volume or the entered weight allocation produces the lower loadable cargo mass.
Does this calculator approve a vessel loading plan?
No. It does not assess stability, trim, tank-top strength, load lines, cargo hazards, or structural loading.