science

Stowage factor

Stowage factor is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Stowage factor rather than just read about it. In short: In shipping, the stowage factor indicates how many cubic metres of space one tonne (or cubic feet of space one long ton) of a particular type of cargo occupies in a hold of a cargo ship. It is calculated as the ratio of the stowage space required under normal conditions, including the stowage losses caused by the means of transportation and packaging, to the weight of the cargo.

Key takeaways

Stowage factor belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Stowage factor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Stowage factor from memory before moving on to harder problems.

Reference excerpt

In shipping, the stowage factor indicates how many cubic metres of space one tonne (or cubic feet of space one long ton) of a particular type of cargo occupies in a hold of a cargo ship. It is calculated as the ratio of the stowage space required under normal conditions, including the stowage losses caused by the means of transportation and packaging, to the weight of the cargo. The stowage factor can be used in ship design and as a reference to evaluate the efficiency of use of the cargo space on a ship.

Variability The stowage factor varies from one type of commodity to another — for example iron ore has a stowage factor of 0.40 (m3/mt), meaning that the space needed by one tonne of ore is only one sixth of that required to stow one tonne of woodchips that have a stowage factor of 2.5. This means that if a ship designed to carry woodchips is loaded with iron ore, only a small part of the hold capacity can be utilized, and a bulk carrier designed to carry iron ore cannot be loaded to the maximum draft with woodchips, leaving much of its deadweight tonnage unutilized. Thus the stowage factor is taken into account in ship design when determining the size of cargo holds, and specialized ships such as ore carriers and car carriers are built for cargoes with a stowage factor that departs significantly from the average. The stowage factor also depends on the type of packaging, being the lowest for unpackaged bulk cargo. While most commonly used for dry bulk cargo, a stowage factor can also be calculated for liquid bulk cargo and other commodities such as containers or cars. Stowage factors for several types of cargo are presented in the following table.

Stowage Factor (SF) Examples Stowage Factor (SF) Example 1: Ship A Deadweight Cargo Capacity (DWCC): 55,000 mtons Grain Cubic Capacity: 70,000 m3 (2,470,000 ft3) Cargo: 55,000 mtons of Bulk Phosphate Bulk Phosphate Stowage Factor (SF) about 0.90 m3/ton (32 ft3/ton) In fact, Ship A has space for 55,000 mtons on her holds 70,000/0.90 = 77,000 mtons or 2,470,000/32 = 77,000 mtons (rounded) However, Ship A can only take 55,000 mtons in weight of Bulk Phosphate before Ship A loadline is submerged

Stowage Factor (SF) Example 2: Ship B Deadweight Cargo Capacity (DWCC): 55,000 mtons Grain Cubic Capacity: 70,000 m3 (2,470,000 ft3) Cargo: 55,000 mtons of Barley Barley Stowage Factor (SF) about 1.47 m3/ton (52 ft3/ton) In fact, Ship B can lift 55,000 mtons 70,000/1.47= 47,500 mtons or 2,470,000/52 = 47,500 mtons (rounded) However, Ship B can only take 47,500 mtons in weight of Barley before Ship B is full and no more space is available in the Ship B's holds

Worked examples

Example 1 — a first encounter with Stowage factor

Start with the simplest possible case. Write down what Stowage factor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Stowage factor before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Stowage factor ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Stowage factor

In research: Stowage factor appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Stowage factor in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Stowage factor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Logistics, Maritime transport, so understanding it makes those chapters shorter.
In everyday life: Look for Stowage factor outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Stowage factor” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Stowage factor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Stowage factor means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Stowage factor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Stowage factor in simple terms?

Why does Stowage factor matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Stowage factor?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Stowage factor.