A container-loading estimate you can actually challenge

Calculate an upper bound

For identical rectangular cartons, test all six axis-aligned orientations against representative internal length, width, and height. Whole-number counts along each axis produce a simple capacity. Compare the best count with volume utilisation to spot obviously unrealistic arrangements.

The highest mathematical count may be hard to load, may place labels incorrectly, or may create weak carton orientation. Keep at least one operationally workable alternative.

Subtract real constraints

Confirm the equipment type and the carrier's actual container specification. Door openings can be smaller than internal dimensions. Floor features, lashing points, moisture controls, dunnage, and load bracing consume space. Heavy cargo may reach payload or axle constraints long before filling the cube.

Mixed-SKU loading is a three-dimensional packing problem with business rules: unloading sequence, compatibility, crush risk, lot separation, and customs access. Use specialist planning or a physical load plan for high-value moves.

• Check payload and verified gross mass requirements.
• Keep the centre of gravity and floor loading reasonable.
• Reserve access and bracing space where required.

Close the loop

After loading, record actual carton count, unused space, loading time, and exceptions. Update the planning factor for the next shipment instead of repeatedly quoting the theoretical maximum.