Container Loading Capacity Calculator
How many cartons fit in a container depends on two limits: space and weight. This calculator checks both, tells you how many cartons you can load and shows which limit you hit first.
Your numbers
Usable internal volume is slightly below the nominal figures quoted by lines.
Check the container data plate and the limit for your road leg.
Allows for dunnage, pallets and unusable gaps. Floor-loaded cartons often achieve 80 to 90 percent.
Your results
Planning estimate only. Real loads depend on pallet footprint, stacking limits, door openings and weight distribution. Confirm with your forwarder or loading plan before booking.
Cartons that fit vs carton weight
Sweeps Carton gross weight from 5 to 60, holding your other inputs fixed.
Load planning from your item master
Optional: a short review of how carton data and open orders could feed container load plans.
Optional. The tool and every export work without this. No spam.
How to use this calculator
Pick the container type, then enter your carton dimensions in centimeters and the gross carton weight in kilograms. Set the payload limit from the container data plate or your carrier's road weight limit, and choose a packing efficiency that reflects how you load. The result shows cartons by volume, cartons by weight and the lower of the two. The chart sweeps carton weight so you can see where the load switches from volume-limited to weight-limited.
The method
Carton volume in cubic meters is length times width times height divided by 1,000,000. Cartons by volume is usable container volume multiplied by packing efficiency, divided by carton volume, rounded down. Cartons by weight is the payload divided by carton weight, rounded down. The cartons that fit is the smaller of the two. Light bulky goods are volume-limited, while dense goods such as metal parts reach the weight limit well before the container is full.
Reading the result
Compare volume and weight utilization. If volume utilization is low and weight utilization is near 100 percent, you are weight-limited, and a larger container will not help. If weight is low and volume is near full, consider smaller cartons, a tighter pack or a high cube container.
- Under 80 percent volume with spare weight: consider denser packing
- Near 100 percent weight: check road axle limits at origin and destination
- Pallets lose space: reduce efficiency to model pallet gaps
- Mixed carton sizes need a loading plan, not a single calculation
Common mistakes
Container planning errors cost real money in extra boxes and failed loads.
- Using nominal volume instead of usable volume
- Ignoring the road weight limit, which can be below the container rating
- Forgetting pallet weight and dunnage
- Assuming 100 percent packing efficiency
- Not checking stacking strength of the cartons
Frequently Asked Questions
How much space is usable in a 40 ft container?
Roughly 67 cubic meters of internal volume for a standard 40 ft box and about 76 for a high cube, before accounting for packing gaps. Exact figures vary slightly by container and manufacturer.
What is a realistic packing efficiency?
Floor-loaded uniform cartons often reach 85 to 90 percent. Palletized freight, odd shapes and mixed cargo reduce that, sometimes to 70 percent or lower. Use your own load history if you have it.
Why is my container full by weight but not by space?
Dense goods like castings, bearings or machined metal hit the payload limit first. In that case, ship in the smaller container that meets the weight need or consolidate other cargo around it.
Does this work for LCL?
It helps size volume and weight for the shipment, but LCL pricing is usually based on the greater of CBM or a weight-based figure. Use the volume per carton output as an input to the forwarder's quote.
If carton dimensions and weights live in your ERP item master, we can help generate load plans straight from open orders.
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