Make the assumptions explicit before using the numbers
Estimate reproducible uniform-grid carton loading for 20GP, 40GP and 40HQ using real carton dimensions, doors and payload. Review space use, remaining cartons, weight limits and an isometric diagram.
The page starts with example results. Replace assumptions with your actual business inputs, check duplicate costs, outside dimensions and confirmed dates, then share the summary with your team. Calculations stay in your browser; no live rates, tax rules, sailings or AI are queried automatically.
Frequently asked questions
Does this calculator find the absolute maximum carton count?
No. It enumerates allowed carton orientations and computes a reproducible uniform grid for each, then checks door passage and payload. The result is an estimate for that arrangement, not mixed orientation, staggered stacking or a global optimum. The volume upper bound is shown separately and is not a loadable carton count.
How should I enter carton dimensions and weight?
Enter the sealed carton’s maximum outside dimensions in centimeters and packed weight in kilograms. Upright mode swaps length and width only. Allowing side placement compares up to six orientations. Reduce usable interior dimensions or payload when ventilation, securing or handling clearance is required.
Where do the 20GP, 40GP and 40HQ dimensions come from?
Presets use published Hapag-Lloyd example tables. Interior, door dimensions and payload are editable. The carrier notes that manufacturers and equipment can differ; 40HQ uses the table’s 235.0 cm width. Confirm the actual equipment, plate, carrier and road constraints before booking.
Why might cartons not fit even when total volume is small enough?
Unused dimensional gaps, carton orientation, doors and payload can all limit loading. The tool checks straight passage through the door in the loading orientation. It does not simulate turning inside, forklift routes, structural forces or complex handling. Orientations that fail the door check are not treated as feasible.
Who can use this, and when is professional load planning needed?
Sales, order operations, sourcing and logistics teams can use same-size carton estimates for early discussions. Mixed SKUs, pallets, dangerous goods, heavy cargo distribution, special equipment, fragility or stacking-strength constraints require professional planning. The diagram draws at most the first 180 cartons and does not show every loaded carton.
Why do requested, loadable and remaining carton counts differ?
Loaded count is limited by demand, grid capacity and payload capacity. Remaining cartons are demand minus loaded count. The overweight notice describes all requested cargo; it does not mean the proposed load exceeds payload. Container count assumes repetition of the same arrangement and is not a booking or delivery commitment.