Method and assumptions
The result is a rectangular grid estimate using reference internal dimensions. Door opening, loading sequence, dunnage, weight distribution and unusable gaps can reduce actual capacity.
The calculator tests all six carton orientations, selects the highest dimension-limited count, then applies the container payload limit.
Worked scenario
Enter reference internal container dimensions, payload and one carton type. The calculator tests six rectangular orientations and then applies payload. Use the result to compare packaging options, not as a final booking quantity. Mixed cartons, pallets and loading access require a separate plan.
How to interpret the result
Door dimensions, corrugation tolerance, dunnage, bracing, ventilation, weight distribution and unloading sequence reduce practical capacity. Container specifications also vary by owner and equipment. Confirm the exact equipment sheet and keep a utilization allowance supported by past loads.
Input reference
- Container type
- Example default: 20 ft standard
- Carton length (cm)
- Example default: 60
- Carton width (cm)
- Example default: 40
- Carton height (cm)
- Example default: 35
- Carton gross weight (kg)
- Example default: 15
Common mistakes
- Using external rather than internal container dimensions.
- Ignoring payload after a dimension-only estimate.
- Treating a single-SKU grid as a mixed-load plan.
Before using the result
- Obtain the equipment specification for the booked unit.
- Reserve space for dunnage and operational clearance.
- Validate high-volume loads with a loading diagram.
Questions to check before deciding
Are these exact container dimensions?
They are common planning references. Confirm the equipment specification supplied by the carrier.
Why may real loading be lower?
Door dimensions, loading access, carton deformation, dunnage and weight distribution create unusable space.
Independent calculator. Not affiliated with or endorsed by the platforms mentioned.