How Many Cartons Fit in a 40-ft Container?

What it depends on

• Carton dimensions, measured as packed, including any bulge.
• Allowed orientations: "this side up" cartons can only turn on the floor; others may lie on a side.
• Stacking strength: how many layers the bottom cartons can carry without crushing.
• Container interior: on one carrier's specs, 12,032 x 2,350 mm of floor for both 40-ft types, with 2,393 mm of height in a standard and 2,697 mm in a high cube.^[1]
• Weight: the container's payload rating and, on U.S. roads, the truck's gross and axle limits.

The method

Work in one unit, such as millimeters. For each way the carton can sit, divide the inside length by the carton's length, the inside width by its width and the inside height by its height; round each result down, then multiply the three. Try every allowed orientation and keep the highest count. A container loading calculator does this grid for you.

Volume alone overstates the answer. Dividing the container volume by the carton volume assumes cartons can be cut to fill every gap, which they cannot.

Worked example: 50 x 40 x 30 cm cartons in a 40-ft high cube

Each carton is 0.06 m³, so 1,050 cartons take 63 m³. The interior on those specs is about 76 m³, but the leftover space is in slivers too thin for another carton.^[1] Mixed orientations, such as a few rows turned at the doors, can sometimes add more; that is a load plan, not arithmetic.

Example

If each of those cartons weighs 20 kg, 1,050 of them are 21,000 kg, inside the 40-ft high cube's rated payload of about 28,620 kg on the same specs.^[1] Before booking, the shipper still checks the whole truck against the 80,000 lb gross and 34,000 lb tandem limits for the drayage leg,^[3] because the cargo is only part of the truck's weight.

Limitations

This is a floor-and-height grid. It ignores carton crush strength, dunnage and bracing, door clearance while loading and where the weight sits. The packing code for containers says not to exceed the unit's payload limits and to distribute heavy cargo over the floor,^[2] and a real load plan also accounts for how the freight will be unloaded: floor-loaded cartons are the slowest way to empty a container.