40 ft Container Capacity and Loading Guide

More length does not mean double every constraint

A 40-foot dry container offers substantially more cubic volume than a 20-foot unit, commonly around the high-60-CBM range depending on equipment. Payload does not necessarily double in the same proportion.

That distinction matters for dense cargo. A shipment can fit easily by volume yet exceed equipment or road-weight limits.

Carton geometry controls practical count

A quick CBM division assumes cargo can use every cubic centimeter. Real rectangular cartons create unusable strips along container walls and ceiling when their dimensions do not divide evenly.

Test all six axis-aligned carton orientations and check the door opening, not just internal dimensions. A box can theoretically fit inside yet fail to pass through the door in its loading orientation.

Plan unloading too

Maximum carton count is not always the best operational load. Destination sequencing, product segregation, bracing and safe unloading can require deliberate space.

For multi-SKU shipments, use a loading diagram or specialized optimization software once the simple uniform-carton estimate stops representing the actual load.

Compare a specific load with the 20 ft preset

For fictional 60 × 40 × 35 cm cartons at 12 kg each, the 20 ft preset gives 9 × 5 × 6 = 270 cartons. The 40 ft preset gives 20 × 5 × 6 = 600. The change is larger than exactly double because 589 cm fits nine 60 cm lengths while 1203 cm fits twenty.

The 600 cartons occupy 50.4 m³ and weigh 7,200 kg before dunnage. The calculator tests all six rotations and this orientation is a best uniform grid for these dimensions. It is still not a mixed-load optimization or permission to stack six layers.

• Load the 40 ft example