Reference
How Many CBM Fit in a 20ft, 40ft and 40HC Container?
A 40ft gives about 67 m³ on paper but only 55–58 m³ usable. Nominal vs. usable CBM by container size, max payload, pallet counts and a realistic loading factor for planning shipments.
A 40ft container holds roughly 67 m³ on paper, but you can realistically load only about 55–58 m³ of packaged cargo once pallets, packaging shapes and stacking limits eat into the space. This reference gives approximate, usable capacities for the three standard ocean boxes — 20ft, 40ft and 40ft High-Cube — so you can plan how much actually fits before you book.
Key takeaways
- A 20ft standard container is about 33 m³ nominal but realistically ~25–28 m³ usable; a 40ft is ~67 m³ nominal, ~55–58 m³ usable; a 40HC is ~76 m³ nominal, ~60–68 m³ usable.
- Plan around a loading factor of ~80% — you almost never fill 100% of a box because of packaging shapes, pallet gaps and stacking limits.
- Max payload is approximate: ~28 t for a 20ft and ~26–28 t for a 40ft/40HC, but most light cargo “cubes out” (fills the volume) long before it “weighs out.”
- A 20ft fits roughly 10–11 standard pallets single-stacked; a 40ft/40HC fits roughly 20–25, depending on pallet footprint and orientation.
- Once you fill about half a container (~13–15 CBM), FCL often beats LCL on cost and speed — worth checking the crossover before you book.
- These figures are nominal planning numbers; your real load depends on packaging, palletisation and whether you can stack — a forwarder confirms the fit from your actual carton dimensions.
How much CBM fits in each container?
The headline volume printed on a container spec sheet is the nominal internal cube — length × width × height of the empty box. Real packaged cargo never reaches it, because cartons leave gaps, pallets add dead space, and you cannot always stack to the ceiling. A practical usable figure runs roughly 80–85% of nominal for well-packed, palletised cargo, and less for awkward or non-stackable freight.
Here are approximate internal dimensions and capacities for the three standard dry boxes:
| Container | Internal dims (approx, L×W×H) | Nominal volume | Usable volume (approx) | Max payload (approx) | Standard pallets (single-stacked) |
|---|---|---|---|---|---|
| 20ft standard (GP) | ~5.9 × 2.35 × 2.39 m | ~33 m³ | ~25–28 m³ | up to ~28 t | ~10–11 |
| 40ft standard (GP) | ~12.03 × 2.35 × 2.39 m | ~67 m³ | ~55–58 m³ | ~26–28 t | ~20–25 |
| 40ft High-Cube (HC) | ~12.03 × 2.35 × 2.69 m | ~76 m³ | ~60–68 m³ | ~26–28 t | ~20–25 |
All figures are approximate and vary by container build, line and condition. For a deeper look at the equipment itself — reefers, open-tops, flat-racks — see our reference on shipping container types and sizes.
Why can’t I use the full nominal volume?
The gap between nominal and usable CBM comes from how real cargo behaves:
- Packaging shapes. Cartons and crates rarely tessellate perfectly, so there are always voids between and around them.
- Pallet gaps. Standard pallets do not divide evenly into a container’s width, leaving strips of unused floor and headroom above each layer.
- Stacking limits. Fragile, heavy-on-top or non-stackable cargo cannot be loaded to the ceiling, which can cut effective volume sharply.
- Door and access space. Loading and securing cargo needs working clearance you cannot fill.
A sensible planning rule is a loading factor of about 80% of nominal volume. If your cargo is light and stacks cleanly on pallets you may do a little better; if it is bulky, fragile or oddly shaped, plan for less.
Will weight or volume fill the box first?
Two limits cap every container: its internal volume and its max payload (the weight it can legally carry). Which one you hit first depends on cargo density.
- Light, bulky cargo — furniture, foam, empty packaging, e-commerce goods — almost always “cubes out”: you run out of space well before you reach the weight limit.
- Dense, heavy cargo — tiles, machinery parts, stone, liquids — can “weigh out”: you hit the ~28 t payload of a 20ft or the ~26–28 t of a 40ft with the box only part full.
For most general cargo from China, volume is the binding constraint, which is why CBM planning matters more than weight. If you are shipping by air instead, the equivalent calculation is chargeable weight — see our explainer on chargeable weight in air freight.
How many pallets fit in a container?
Pallet counts are approximate because they depend on pallet footprint (a 1.0 × 1.2 m EUR-style pallet differs from a 1.0 × 1.0 m or 1.2 × 1.2 m pallet) and on orientation. As a planning guide, single-stacked:
- 20ft: roughly 10–11 standard pallets.
- 40ft / 40HC: roughly 20–25 standard pallets.
If your cargo is stackable and your pallets are not at full height, you can sometimes double-stack and carry more — but only if weight and product fragility allow. Good palletisation is what turns nominal CBM into usable CBM; our guide on how to pack and palletise export cargo covers the practical detail.
At what volume does FCL beat LCL?
If your cargo does not fill a container, you can share one through LCL (less-than-container-load) and pay by the CBM. But LCL pricing per cubic metre rises with volume, while a full container (FCL) is a flat box rate — so there is a crossover.
As a rough planning rule, once you fill about half a 20ft container — somewhere around 13–15 CBM — FCL often becomes cheaper and faster than LCL, because you avoid consolidation handling and deconsolidation delays at destination. The exact break-even depends on the lane, the season and current rates, so it is worth pricing both. Our comparison of FCL vs LCL ocean freight walks through the trade-offs in full.
Frequently asked questions
How many CBM fit in a 20ft and a 40ft container? A 20ft holds about 33 m³ nominal but realistically ~25–28 m³ of packaged cargo; a 40ft holds about 67 m³ nominal and ~55–58 m³ usable. A 40ft High-Cube adds about 30 cm of internal height for ~76 m³ nominal and ~60–68 m³ usable. Treat these as approximate planning figures — your real load depends on packaging and stacking.
Why can’t I load the full nominal CBM? Because real cargo leaves gaps. Cartons do not tessellate perfectly, pallets do not divide evenly into the container width, and fragile or non-stackable goods cannot be loaded to the ceiling. Plan around a loading factor of roughly 80% of nominal volume, and less for bulky or awkward freight.
What is the maximum weight a container can carry? Approximately up to ~28 t for a 20ft and ~26–28 t for a 40ft or 40HC, varying by container and line. For most light cargo from China the volume fills the box before you ever reach the weight limit, so CBM is usually the constraint that matters.
How many pallets fit in a container? Roughly 10–11 standard pallets single-stacked in a 20ft and 20–25 in a 40ft or 40HC, depending on pallet size and orientation. You can sometimes fit more by double-stacking if weight and fragility allow.
When should I switch from LCL to a full container? As a rough guide, once you fill about half a container (around 13–15 CBM) a full container (FCL) often beats LCL on cost and speed. The exact crossover shifts with the lane, season and current rates, so price both before booking.
Get a quote based on your actual volume
CBM tables get you a plan; a forwarder gets you the real fit. When you are ready for real numbers, message us on WhatsApp with your carton dimensions, total volume, weight and product, and we will tell you which box loads most efficiently and send a tailored quote with a realistic transit window. This reference sits within our guide to air and ocean freight from China.
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