Container Loading Calculator: How It Works & Full Guide | Tradloc
Everything behind the Container Loading Calculator: how to use it step by step, what the numbers mean, worked examples and the background reference importers ask about most. The tool itself stays one click away.
What the Container Loading Calculator does
Calculate how many cartons fit into a 20ft, 40ft or 40HC container and see the resulting utilization percentage. Optimize packing before you book the container.
- Avoid under-utilized containers
- Cost-per-carton visibility
- Better forwarder conversations
How to use the Container Loading Calculator
Work out how many cartons fit into a 20ft, 40ft or 40HC container and what container utilisation you achieve.
- 1Enter your carton dimensions
Type the length, width and height of a single carton in centimetres, plus its gross weight in kilograms.
- 2Enter the quantity you plan to ship
Add the total number of cartons in the consignment so the calculator can compare cargo volume against container volume.
- 3Select the container type
Choose 20ft, 40ft or 40ft high cube. The calculator uses real internal dimensions rather than nominal external sizes.
- 4Read cartons per container and utilisation
The result shows the maximum cartons per container, the cubic metres used and the container utilisation percentage.
- 5Optimise before you book
Adjust carton size or container type until utilisation is above roughly 85%, then price the booking with the Freight Cost Estimator.
Container Loading Calculator — Plan Your Container Load Precisely
Tradloc's container loading calculator returns the maximum number of cartons that fit into a 20-ft, 40-ft or 40HC container load, along with utilisation percentage and recommended container size. Right-size the box before you book the freight.
20-ft vs 40-ft vs 40HC
| Container | Internal (L × W × H) | Volume | Max payload | Best for |
|---|---|---|---|---|
| 20-ft dry | 5.90 × 2.35 × 2.39 m | 33 CBM | ~28 MT | Dense cargo (metals, minerals, urea) |
| 40-ft dry | 12.03 × 2.35 × 2.39 m | 67 CBM | ~28 MT | Volume-heavy cargo |
| 40-ft HC | 12.03 × 2.35 × 2.69 m | 76 CBM | ~28 MT | Bulky, lightweight cargo (polymer bags) |
Container loading optimisation
- Match carton footprint to pallet footprint — waste starts at the box, not the container.
- Load heavy items on the floor and lighter items on top.
- Distribute weight evenly across the container to keep the axle load legal at destination.
- Leave 3–5 cm of shrink-wrap play for cargo shift in transit.
- Use dunnage bags between pallet rows on partial loads.
Export packing guidelines
- ISPM-15 heat-treated pallets stamped for GCC entry.
- Shrink-wrap and strap every pallet before loading.
- Container inspection: no leaks, no odours, no loose fittings.
- Photograph the loaded container before sealing.
- Attach packing list to inside of container door for fast customs inspection.
How to plan an export container load, step by step
- Take carton dimensions, carton gross weight and quantity per SKU from the packing list.
- Convert to CBM (L × W × H in metres × quantity) and total the gross weight.
- Test the carton fit against internal container dimensions, not nominal volume.
- Check gross weight against the ~28 MT payload limit before choosing 40-ft over 20-ft.
- Sequence the stow: heavy and dense SKUs first, light and fragile SKUs last.
- Issue the load plan with the booking so the CFS or factory loads to plan.
Loading patterns for cartons, pallets and drums
- Cartons, floor-loaded: brick-stack in alternating rows for maximum fill; expect 90–95% utilisation.
- Palletised cartons: 11 Euro pallets in a 20-ft, 23–24 in a 40-ft; utilisation typically 78–85%.
- 200 L drums: 80 upright in a 20-ft, 160 in a 40-ft; secure with dunnage bags between rows.
- Big bags / jumbo bags: 20 × 1 MT bags in a 20-ft, weight-limited long before volume.
Volumetric vs gross weight in FCL
FCL sea freight is priced per container, so volume usually decides the box size and weight only matters against the payload cap. Dense cargo — tiles, steel, minerals, chemicals in drums — hits roughly 28 MT long before it fills 33 CBM, which is why it ships in 20-ft boxes. Bulky, light cargo such as polymer bags or foam runs out of volume first and belongs in a 40HC at 76 CBM.
Common container loading mistakes
- Booking a 40-ft when the payload limit means a 20-ft would have carried the same cargo.
- Sizing cartons without checking the pallet footprint they will sit on.
- Ignoring the VGM declaration deadline and losing the sailing.
- Uneven weight distribution that makes the container illegal on destination roads.
- No photographs of the loaded container before sealing — no evidence in a damage claim.
Related tools & guides
Boxes per pallet, layers per pallet, pallets per container.
Cubic metres from carton dimensions and quantity.
Ocean freight cost per container by origin and destination.
Estimated port-to-port sailing times.
Complete pallet-size × container-size reference.
Maximum cartons per container and utilization percentage.
Convert box dimensions and quantity into cubic metres.
Boxes per pallet and pallets per container.
Frequently Asked Questions
- Does it account for pallet size?
- Use the Pallet Calculator for palletized loads.
- How many pallets fit in a container?
- A 20ft container fits 11 Euro pallets (80×120 cm) or 9–10 ISO pallets (100×120 cm) on a single tier. A 40ft or 40HC fits 23–24 Euro pallets or 20–21 ISO pallets. Use the Pallet Calculator for palletised cargo and this calculator for loose cartons.
- How do I calculate container loading?
- Multiply carton length × width × height to get carton volume in CBM, multiply by quantity for total cargo volume, then divide by the container's usable internal volume — about 33 CBM for a 20ft, 67 CBM for a 40ft and 76 CBM for a 40HC. This calculator does that plus an orientation-aware carton fit test.
- What is container utilisation?
- Container utilisation is the share of the container's internal volume actually filled by cargo, shown as a percentage. Freight is charged per container, not per CBM, so anything below roughly 85% utilisation means you are paying for air.
- How do I plan an export container loading list?
- Start from the packing list: carton dimensions, carton weight and quantity per SKU. Convert to CBM, test the carton fit against the container's internal dimensions, then check gross weight against the ~28 MT payload limit. Heavy SKUs go on the floor, light SKUs on top, and the final load plan goes to the forwarder with the booking.
- What is volumetric vs gross weight for container loading?
- Sea FCL is charged per container, so volume normally decides the container size and weight only matters against the payload limit. Dense cargo such as tiles, metals or minerals hits ~28 MT before it fills 33 CBM — load those in 20ft boxes; bulky, light cargo such as polymer bags belongs in a 40HC.
- What are the most common container loading mistakes?
- Choosing a 40ft when a 20ft would have carried the weight, ignoring pallet footprint when sizing cartons, over-stacking fragile cartons, uneven weight distribution that makes the container illegal on destination roads, and no photographs before sealing the container.