The 20′ Dry Container (20DC) Loading Guide explains how to assess cargo against a standard enclosed dry-container planning envelope before freight is booked or loading begins. A 20DC is widely used for dense general cargo, but a workable plan depends on more than total CBM. Packaged dimensions, payload, weight distribution, door access, stacking rules and securing requirements all matter.
For a quick visual check, CBM3.net’s free 3D container loading calculator lets shippers, freight forwarders and warehouse teams build a 20DC load using measured cargo data. It is a practical planning tool, not a substitute for the container’s CSC plate, carrier instructions, a certified lashing plan or applicable road and maritime regulations.
What is the 20′ Dry Container (20DC) profile?
A 20′ Dry Container, commonly identified as 20DC, is an enclosed ISO freight container for non-temperature-controlled cargo. In ocean freight, it represents one TEU and is often selected for high-density shipments where a 40-foot container would leave substantial unused volume.
The profile is relevant for cartons, cases, drums, bagged goods, machinery, palletised products and other dry freight that can pass through the doors and be safely supported by the container floor. It is not automatically suitable for every dry product. Oversize cargo, hazardous goods, freight requiring ventilation, unusually concentrated floor loads, or goods needing temperature control require separate equipment and operating checks.
CBM3 records the current 20DC profile as a planning envelope. Dimensions can vary by manufacturer, container age, door construction and operator fleet, so the physical unit supplied for loading always takes priority over generic specifications.
20′ Dry Container (20DC) Loading Guide: dimensions and payload
The following values are the current CBM3 planning inputs for the 20DC equipment profile. They help make a loading scenario reproducible in the calculator. They should not be treated as a carrier booking guarantee or as a replacement for the container data plate.
| CBM3 profile field | Current planning value |
|---|---|
| Equipment code | 20DC |
| Profile type | Sea container |
| Planning length | 589 cm |
| Planning width | 235 cm |
| Planning height | 239 cm |
| Calculated planning volume | 33.081185 m³ |
| Payload-check value | 28,200 kg |
| Payload state | Validated |
| Evidence status | Conditional |
At these dimensions, the theoretical internal volume is approximately 33.08 CBM. In day-to-day freight planning, usable volume is usually lower. Pallet footprints, door-end clearance, irregular carton sizes, no-stack restrictions, voids between units and load-securing materials all reduce practical utilisation.
The 28,200 kg figure is a payload-check value used in the CBM3 profile. It is not the same as the maximum gross mass shown on every individual container. Payload is normally derived from maximum gross weight less tare weight, and both figures must be checked on the actual unit. Road weight limits, axle loading and local permits can further restrict allowable cargo weight after the container leaves the port.
How Many Pallets and Cartons Fit in a 20′ Dry Container (20DC)?
A 20-foot dry container, commonly called a 20DC or 20′ standard container, is one of the most frequently used container types in international shipping. Typical internal dimensions are approximately 5.90 m long, 2.35 m wide, and 2.39 m high, providing around 33.2 m³ of internal volume.
The actual number of pallets or cartons that can be loaded depends on cargo dimensions, packaging, stacking limitations, weight, and the loading arrangement.
How Many Pallets Fit in a 20DC?
Pallet capacity mainly depends on the pallet footprint and orientation. When pallets are loaded in a single layer, a standard 20DC can typically accommodate:
| Pallet Type | Pallet Size | Typical Quantity |
|---|---|---|
| Euro Pallet (EUR/EPAL) | 120 × 80 cm | 11 pallets |
| Industrial / ISO Pallet | 120 × 100 cm | 9–10 pallets |
| US GMA Pallet | 48 × 40 in (122 × 102 cm) | About 10 pallets |
For example, if your shipment uses Euro pallets measuring 120 × 80 cm, an optimized loading arrangement can fit approximately 11 pallets on the container floor.
If the goods are safely stackable, two pallet layers may sometimes be possible. However, pallet height, cargo strength, weight distribution, and the maximum container payload must always be considered.
How Many Cartons Fit in a 20DC?
The number of cartons depends heavily on carton dimensions. The examples below assume rectangular cartons loaded efficiently without pallets.
| Carton Size | Approx. Maximum Cartons* |
|---|---|
| 60 × 40 × 40 cm | 225 cartons |
| 50 × 40 × 30 cm | 392 cartons |
| 40 × 30 × 30 cm | 686 cartons |
| 30 × 30 × 30 cm | 931 cartons |
*These figures are dimensional loading estimates based on efficient aligned placement. Actual quantities may be lower because of door clearance, carton deformation, dunnage, cargo securing requirements, loading orientation, and weight restrictions.
For example, a carton measuring 50 × 40 × 30 cm has a volume of 0.06 m³. Dividing the container’s 33.2 m³ capacity by 0.06 m³ gives a theoretical result of more than 550 cartons. However, this calculation does not consider how cartons physically fit along the container’s length, width, and height.
With an efficient aligned arrangement, approximately 392 cartons of this size can fit inside a 20DC. This demonstrates why calculating only total CBM may produce an unrealistic loading estimate.
For a more accurate result, enter your carton or pallet dimensions, quantities, and weights into the CBM3 container loading calculator. The 3D container loading tool can calculate realistic cargo placement and help you optimize available space before booking your shipment.
When a 20DC is the right planning choice
Select the 20DC profile only when the booking confirmation, equipment offer or operational instruction calls for that equipment type. Do not choose it simply because “20-foot container” is familiar terminology. A standard 20DC, a 20-foot reefer, an open top, a flat rack and a palletwide unit may have very different usable dimensions, payload characteristics and handling constraints.
A 20DC is often commercially sensible for compact, heavy cargo. Examples include ceramic products, canned goods, metal components, paper products, bagged ingredients and dense pallet loads. Conversely, low-density consumer goods may cube out a 20DC well before reaching its payload limit, making a larger container more economical if available.
- Use packaged dimensions, not bare product dimensions.
- Include pallet height, slip sheets, corner boards, dunnage and any overhang.
- Record each SKU’s quantity, unit weight and permitted orientation.
- Identify fragile, crush-sensitive and non-stackable freight before calculating.
- Confirm whether cargo must be loaded in delivery-stop order.
- Check the actual container door opening separately from the internal envelope.
If freight is split across several units, use CBM3’s multi-container planning tools to allocate cargo between containers and reallocate items by drag and drop. This is particularly useful when one container becomes weight-limited while another still has available cubic capacity.
Simple carton CBM and weight example
Consider a carton measuring 50 cm × 40 cm × 30 cm. Convert each measurement to metres before calculating volume: 0.50 m × 0.40 m × 0.30 m. The result is 0.060 CBM per carton.
| Example input | Calculation | Result |
|---|---|---|
| Carton dimensions | 0.50 m × 0.40 m × 0.30 m | 0.060 m³ each |
| Carton quantity | 10 × 0.060 m³ | 0.600 m³ total |
| Unit weight | Assume 18 kg each | 180 kg total |
| Theoretical share of 33.081185 m³ | 0.600 ÷ 33.081185 | About 1.8% |
The calculation provides a useful starting point, but it does not prove physical fit. Ten cartons may fit in many ways, while 500 cartons may leave unusable gaps depending on orientation and stacking limits. Weight also needs separate attention. Cargo can use only a small share of container volume and still create a payload, floor-loading or centre-of-gravity issue.
Enter dimensions and weight separately in CBM3.net. The free calculator can model the arrangement visually, show placed and unplaced quantities, and help identify whether the limiting factor is volume, geometry, weight or load balance.
Why total CBM does not prove cargo fits in a 20DC
CBM is a volumetric measure, not a loading pattern. A shipment of 30 CBM may appear to fit within a 33.08 CBM container, yet still fail because a long crate cannot rotate through the door, a pallet is too wide for the available internal width, or a non-stackable item consumes the height above it.
Geometric fit depends on the exact dimensions of every loading unit and the operational rules applied to it. Practical questions include whether cartons may be turned on their side, whether pallets can be double-stacked, whether top-loading is allowed, and whether the supporting surface is adequate for cargo placed above.
CBM3 provides real-time WebGL visualisation in Operational, Realistic Digital Twin and X-Ray modes. The X-Ray view is useful for inspecting internal placement and voids that are difficult to identify from a simple volume total. For palletised freight, the platform can test column, brick and pinwheel stacking patterns with support-surface validation.
20′ Dry Container (20DC) Loading Guide: step-by-step planning in CBM3
- Confirm that the offered equipment is genuinely a 20DC and obtain the actual unit details where possible.
- Measure each finished loading unit: length, width, height, gross weight and quantity. Include pallets and protective packaging.
- Import a cargo spreadsheet through CBM3’s CSV and Excel import tool, or enter SKUs manually. Check that dimensions, weights and quantities are mapped correctly.
- Select permitted rotations. Do not allow a rotation that would place labels, liquids, fragile goods or designed-upward packaging in an unsafe orientation.
- Mark non-stackable cargo, maximum stacking limits and priority items. Where delivery involves multiple stops, apply LIFO logic so Stop 1 freight is positioned near the doors.
- Generate the plan and inspect every item in the 3D view. Review unplaced pieces rather than relying on the total CBM figure.
- Review the three-axis centre-of-gravity result and weight-distribution warnings. A physically packed container can still create an undesirable axle or handling balance condition.
- Check remaining voids and plan suitable dunnage, blocking, bracing or lashing according to the cargo and applicable requirements.
- Export a PDF packing guide from CBM3 with 3D snapshots, loading sequence and centre-of-gravity diagrams for the warehouse team.
The animated loading sequence is particularly useful where multiple crews or shifts are involved. Rather than relying on a static drawing, warehouse personnel can review which pallet, carton or crate should be loaded first and how the pattern develops toward the doors.
Weight distribution, axle loading and floor pressure
A container can remain below its overall payload limit and still be operationally unsuitable if weight is concentrated in one area. Dense machinery, metal coils, drums and stone products need particular care. Mass distribution affects centre of gravity, forklift handling, chassis axle loads and road compliance.
CBM3’s weight distribution and axle loading checks calculate centre of gravity across three axes and flag potential road-compliance concerns. These warnings support planning decisions, but the final legal assessment must use the tractor, chassis, route, local axle limits and actual verified cargo weights.
Also consider the floor. A heavy point load may require load-spreading materials even when the container’s total payload is acceptable. Confirm floor-loading limits, forklift entry arrangements and the support condition of pallets or skids with the equipment operator and cargo engineer where required.
Common 20DC loading mistakes
- Selecting a container by familiar name rather than checking the exact equipment code and supplied unit.
- Using product dimensions before packaging, palletisation or overhang.
- Assuming all 33.08 CBM can be filled by every cargo mix.
- Ignoring door-opening constraints and loading access.
- Allowing carton rotation without confirming packaging and product-orientation rules.
- Missing unplaced items because the total shipment CBM appears low enough.
- Placing dense cargo at one end without checking centre of gravity and axle implications.
- Using a calculator result as evidence of dangerous-goods approval, restraint certification or carrier acceptance.
- Failing to rerun the plan after quantities, weights, pallet dimensions or delivery sequencing change.
What must be confirmed outside the calculator
A container loading plan is only one part of release-to-load preparation. Before loading, verify the container number, equipment condition, interior dimensions, door opening, tare weight, maximum gross mass and payload marking on the supplied unit. Inspect the floor, walls, roof, doors and locking gear for damage that could affect loading or cargo safety.
Confirm the handling method, cargo-securing plan, route restrictions, VGM process, customs documentation and any regulated-cargo requirements. Temperature control, dangerous-goods acceptance, certified lashing, marine survey requirements and carrier-specific policies must be handled through the responsible parties.
Where CBM3 planning values differ from the physical container or applicable operating documentation, the physical unit and governing requirements prevail. Update the scenario, select another profile from the available equipment library, or revise the load plan before cargo is loaded.
Continue planning your 20DC shipment
Use this 20′ Dry Container (20DC) Loading Guide as a disciplined starting point: measure finished cargo, test the real loading geometry, review weight distribution and verify the actual container before dispatch. For mixed-SKU loads, equal FCL allocation or multi-stop delivery plans, 20DC Container Loading Calculator provides a free visual workflow with no paywall.
You can also return to the Loading Space Guides to compare available equipment profiles. Once the plan is ready, share it with colleagues through a unique plan code or via WhatsApp, Telegram, Teams or email so the freight forwarder and warehouse crew work from the same loading sequence.
Frequently asked questions
How many CBM does a 20DC hold?
The current CBM3 20DC planning profile calculates to 33.081185 m³ based on 589 cm × 235 cm × 239 cm. Usable capacity is lower for many shipments because pallets, voids, door clearance, cargo orientation and stacking restrictions reduce the space that can be practically filled.
What is the payload of a 20-foot dry container?
CBM3 uses 28,200 kg as the current payload-check value for its 20DC profile. The actual permitted payload depends on the individual container’s maximum gross mass and tare weight, as well as road, chassis and route restrictions. Always verify the plate and operator documentation.
Can I load pallets in a 20DC?
Yes, provided pallet dimensions, total height, weight, overhang and fork-entry needs are compatible with the container. Measure finished palletised loads and model them as they will travel. A pallet pattern that fits by CBM may still fail because of width, door access or an unsafe stacking arrangement.
Does a 3D loading plan replace a cargo securing plan?
No. A 3D plan shows how cargo may fit and helps identify loading order, voids and weight balance. It does not certify blocking, bracing, lashing, floor strength, dangerous-goods compliance or carrier acceptance. Those requirements must be confirmed separately.
Can CBM3 plan more than one container at a time?
Yes. CBM3 supports multi-container planning and drag-and-drop cargo reallocation. Its Equal FCL Solver can also distribute mixed-SKU cargo across containers to support more balanced volume and payload utilisation.